The counter. Feb 1, 2017 - vhdl code for ring counter, N-bit ring counter vhdl behavior structural code, vhdl code for switch tail ring counter Giữ an toàn và khỏe mạnh. In this case it is header_type_sm. The simplest circuit is the asynchronous one where the inverted output (/Q) from one stage feeds the clock pulse input (CK) of the following stage. c_out is serial data out. that creating confusion. Selection of Counter design: The chosen design for the 4-bit counter is a simple 4-bit synchronous counter with synchronous set and. CODE_vhdl_INITIALIZING IN 2 LINE LCD DISPLAY AND YOU CAN ON/OFF LCD(KHỞI TẠO HIỂN THỊ 2 HÀNG LCD VÀ CÓ THỂ TẮT/ MỞ LCD) CODE_vhdl_INITIALIZING IN 2 LINE LCD DISPLAY AND YOU CAN ON/OFF LCD(KHỞI TẠO HIỂN THỊ 2 HÀNG LCD VÀ CÓ THỂ TẮT/ MỞ LCD) For this code you can easily enable or disable the LCD by pressing the button. Write a VHDL procedure minMax that takes two eight bit inputs and produces two eight bit outputs. convert ( blinker , fblinker. The counter also has a reset input. 3 Bit Ripple Counter Vhdl Code For A Jk Iobit Malware Fighter. UP/DOWN COUNTER: library IEEE; use IEEE. A 4-bit binary counter gives a carry-out signal when the counter has value 15=H”F”; a modulus-10 counter gives a carry-out signal at value 9. Traffic light controller using task. Synthesize the design. 2-bit Counter VHDL Code - VLSI Encyclopedia. Library ieee; use ieee. 4-bit Ripple Counter. The counter incrementsits countoneach positiveedgeofthe clockif the Enablesignal is asserted. Cyber Investing Summit Recommended for you. Explains how to write VHDL code for 4 bit counter and mod 10 counter. Reply Delete. VHDL and Verilog Codes Saturday, 13 July 2013. The implied storage results from the if statement not providing. 3-Bit UP / DOWN Counter ( Structural ) with Test Bench Program FULL ADDER using Two HALF ADDERS and One Or gate (STRUCTURAL) 64 x 1 MULTIPLEXER using 8 x 1 multiplexer (Structural) with the help of "GENERATE". std_logic_unsigned. Simplified 4-bit synchronous down counter with JK flip-flop. The module has 3 inputs - Clk, reset which is active high and a UpOrDown mode input. State machines can be defined in VHDL within a CASE statement. When the counter reaches 9, next count value will be 0, then the 4-bit counter wraps at 9 ("1001"), not at 15 ("1111") as a 4-bin binary counter does. in writing a VHDL code for a 2-digit BCD counter with active-LOW asynchronous clear, active-High synchronous load, and an Active-High count enable. 8-Bit Up Counter With Load. Schematics to interface LED with FPGA/CPLD project Board LED Placement in FPGA/CPLD project Board VHDL Code for 16-Bit Binary Counter. std_logic_1164. STD_LOGIC_UNSIGNED. Synthesis and implementation of 4-bit Up/Down Counter to Spartan-3E FPGA Board demonstrating correct functionality for the required test cases. VHDL: (vcom-1136: std_logic_vector undefined) syntax,vhdl. Lab 3: Four-Bit Binary Counter EE-459/500 HDL Based Digital Design with Programmable Logic you must design a synchronous counter version of our fourbit_counter to arrive to a VHDL code - of your entire design. Part 2: Button Debounce Timer Open your latest SimonGame project that has the button debounce circuit. Dibal: Design and Implementation of MOD-6 Synchronous Counter using VHDL. A “reset” signal resets the counter to 0. VHDL nbit synchronous counter with parallel load input structural design code plus test in circuit ISE Xilinx This video is part of a series which final design is a Controlled Datapath using a structural approach. The block diagram and truth table of 4 Bit Binary Asynchronous Reset Counter VHDL Code is also mentioned. This is a purely digital component and we'll explain how it works and what its output looks like here. The counter increments the count signal on each positive edge of the clock if the Enable signal is asserted. EDA Tools: Design entry/ synthesis: 4-Bit Synchronous Up Counter 6 Simulation: ModelSim (VHDL) Timing Analysis: None h. Find some verilog beginner codes here. The Holiday A Soldier Is Never Off Duty Part 1 In Hindi Dubbed Free Download. What are the advantages and disadvantages for this circuit that has 2-input AND gate as compared to the previous design which has 3-input AND gate? Tips: The answers can be apparent if you think the counter with large bits, eg: 16 bit synchronous counter. Reset and enable is also part of the project. A ring counter is a type of counter composed of flip-flops connected into a shift register, with the output of the last flip-flop fed to the input of the first, making a "circular" or "ring" structure. Verilog code for PWM Generator. all; entity synchronous_reset is port (clock, Reset, data: Std_logic; q: std_logic); end synchronous_reset; architecture bhv of synchronous_reset is begin. N-bit Adder Design in Verilog. vhdl - asynchronous & synchronous up down counter code - vlsi lab By Unknown at Saturday, March 15, 2014 materials , vhdl , VLSI No comments VHDL - ASYNCHRONOUS & SYNCHRONOUS UP DOWN COUNTER CODE -. In the following sections, we will look at 4-bit shift registers. Of course, doing some computing on the data is possible, but this example will emphasis connections outside the FPGA. 5 User-defined data types and arrays 19. Generate reference outputs and compare them with the outputs of DUT 4. 25 you have to represent in 32-bit and 24. 2 Binary Ripple Up-Down Counter 7. Design a 3-Bit ripple counter that counts up 2. 3 Synchronous Counters with Parallel Load Using INTEGER. This is the 4-Bit Ripple Counter circuit diagram with the detailed explanation of its working principles. b) Produce the state table for your design. An up/down counter is a digital counter which can be set to count either from 0 to MAX_VALUE or MAX_VALUE to 0. Down counter counts the numbers in decreasing order. Verilog code for Multiplexers. std_logic_unsigned. MOD-16 for a 4-bit counter, (0-15) making it ideal for use in Frequency Division applications. VHDL Code for an SR Latch library ieee; use ieee. Develop a testbench and simulate the design. Tutorial 7: Binary Counter in VHDL. Vhdl code for 4 bit updown counter? UP-DOWN COUNTER library IEEE. Programming & Languages It is a lot good material on web regarding VHDL coding. Its operating frequency is much higher than the. 2 • State Machines with No Control Inputs 463 VHDL Design of State Machines Enumerated type A user-defined type in VHDL in which all possible values of a named identifier are listed in a type definition statement. Favorite Answer. Example 3: Four-Bit Binary Counter 1. This page of VHDL source code section covers 4 Bit Binary Asynchronous Reset Counter VHDL Code. Jump to navigation Jump to search. port(j,k, clk,clr:in std_logic; q,qbar:out std_logic); ASYNCHRONOUS COUNTER USING JK FLIPFLOP; SYNCHRONOUS COUNTER USING SR FLIPFLOP;. if reset is '0', then count value & cout is loaded all zeros. 4-3 Verilog Synchronous Transmit Mode FIFO ch2/test4syncreset. [ 8M] b) Design MOD-16 synchronous counter using T- Flip-Flop? [ 8M] ***** R13 SET - 1 www. 0 General flip-flop coding style notes 3. Search this site VHDL: BCD up/down counter www. I am going to design a N-bit ring counter in vhdl. 1 Design of Synchronous Counter Using D Flip-Flops 7. Aside from learning about the on-board clock signal and push-buttons as well as about frequency dividers, this lab reinforces the design flow steps introduced in the previous labs. STD_LOGIC_ARITH. Timing diagram of Asynchronous counter For example, if the present count = 3, then the up counter will calculate the next count as 4. 3) VHDL Code 4-bit Up Counter with Enable and Asynchronous Reset : library IEEE; use IEEE. Designing a 3 bit synchronous counter using jk flip flop is not an easy project for the uninformed. • In general, the best way to understand counter design is to think of them as FSMs, and follow general procedure, however some special cases can be optimized. The manual also discusses FPGA and CPLD optimization techniques and explains how to run XST from Project Navigator. In fact, you don't need the above line at all - the counter will automatically wrap-round. Generate reference outputs and compare them with the outputs of DUT 4. Design a 2 bit up/down counter with an input D which determines the up/down function. synchronous up down counter vhdl code and test ben up counter with preload vhdl code and test bench; d flipflop with setup/hold violation, reset recove d flipflop with asynchronous reset enable and load 4 bit adder/substractor using full adder; 4 bit magnitude comparator vhdl code; Introduction to VHDL. 2 Bit Multiplier Vhdl Code. This means the synchronous counters depends on their clock input to change state values. all; entity counter is port(C, CLR, UP_DOWN : in std_logic; Q : out std_logic_vector(3 downto 0)); end counter; architecture archi of counter is. This example shows two different methods for mapping the lpm_counter function. You might have a good reason for asynchronous reset, but if not, synchronous reset is a better habit. Could someone please post me how to write 5bit Up/Down Counter with reset and preset in VHDL? VHDL for FPGA Design/4. Report on D-Flipflop Course project for ECE533. It achieves the high-speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissi-pation. 4 Synchronous Counters 7. Synthesis and implementation of 4-bit Up/Down Counter to Spartan-3E FPGA Board demonstrating correct functionality for the required test cases. Following is VHDL code for an 8-bit shift-left register with a. The bit-storage capability in the VHDL is not explicitly stated; but is implied by both the VHDL code statements and the way the VHDL code is interpreted. In that respect it has a lot in common with functional programming. It is a 4-bit synchronous counter, which uses four T-type flip-flops. 4-bit synchronous up counter. The simplest circuit is the asynchronous one where the inverted output (/Q) from one stage feeds the clock pulse input (CK) of the following stage. library ieee; use ieee. 1i with VHDL codes. It then becomes 0010 at the next clock cycle - and this keeps going on. Since we cannot clock the toggling of a bit based on the toggling of a previous bit in a synchronous counter circuit (to do so would create a ripple effect) we must find some other pattern in the counting sequence that can be used to trigger a bit toggle: Examining the four-bit binary count sequence, another predictive pattern can be seen. A flip-flop can be used as a counter to count two states since Flip flop has two states either 0 or 1. Counters are a principle part of nearly every FPGA design, facilitating time tracking in logic circuits by counting clock cycles. Chapter 9 Counters Ppt Video Online Download. 10‐bit Synchronous Up/Down Counter Combined with an ALU using the MicroBlaze Microcontroller - FadouaKhm/VHDL-Microblaze-10bit-Counter. 4-Bit BCD Up Counter with Clock Enable. If an asynchronous reset approach had be used,. std_logic_1164. Shifter Design. A 4−bit synchronous up−counter. VHDL Code for Synchronous Reset. 4-bit Unsigned Down Counter with Synchronous Set IO Pins Description C Positive-Edge Clock S Synchronous Set (active High) Q[3:0] Data Output VHDL Code Verilog Code library ieee; use ieee. There is enough code here to be used in 90% of VHDL code (both RTL and Simulation). all; entity srl is port(r,s:in bit; q,qbar:buffer bit); end srl; architecture virat of srl is signal s1,r1:bit; begin q<= s nand qbar; qbar<= r nand q; end virat;. Why N-bit gray counter. I just constructed the verilog code from a block diagram I found on the internet, and sure enough, it does. In part 1 of this series we focused on the hardware design, including some of the VHDL definitions of the I/O characteristics of the CPLD part. Reset is active high and enable is also active high. In the VHDL program the Q outputs were defined for the k,l,m AND structure. Library ieee; use ieee. std_logic_unsigned. The module uses positive edge triggered JK flip flops for the counter. Use the Load feature to Example 4: Gray code counter. The counter also has a reset input. 4-2 VHDL FOFO Model ch2/fifo. i hav interface digilents pmod cls with nexys 2 board (spartan 3e) using the SPI protocol. Simulate the module to obtain a timing diagram similar to Figure. 4-bit counter. This makes the design very simple and straightforward meaning it is a synchronous system with a single counter to go through the bytes of the data. sn54160, sn54162, sn74160, sn74162 synchronous 4-bit counters sdls060 – october 1976 – revised march 1988 4 post office box 655303 • dallas, texas 75265. 3-7 Verilog EDAC 32-bit Hamming Code Converted from VHDL Package ch2/ram40. It can assert and desert a flipflop synchronously. Help me please to write te vhdl code about the next delivery: Consider the circuit in FigureA. Vhdl Counter Vhdl Counter. Save the VHDL file (Figure 5) as three_bit_counter. Counters are sequential circuits that employ a cascade of flip-flops that are used to count something. In case of our 8-bit counter, we need to notice few things:. Could someone please post me how to write 5bit Up/Down Counter with reset and preset in VHDL? VHDL for FPGA Design/4. [Reorganising the former Unit 2. process (C, CLR) begin. Verilog Code for 4 bit Ring Counter with Testbench. Synthesis and implementation of 4-bit Up/Down Counter to Spartan-3E FPGA Board demonstrating correct functionality for the required test cases. with the above change now the value for q stays 4'b0000 and if i remove the statement of initializing assign q=4'b0000, i again get 4'bxxxx for q. 7-10 HDL Representation for Shift Registes and Counters— VHDL Ripple counter, Synchronous binary counters, other counters) 3-bit A 2 A 1 A 0 000 001 010 011. VHDL code to simulate 4-Bit Binary Counter by software using spartan 3 Starter Kit Sign up to get notified when this product is back in stock VHDL code to simulate 4-bit Binary Counter by Software. std_logic_1164. Values are as per the DDR2 SDRAM JEDEC standard C_DDR_AWIDTH + C_DDR_COL_AWIDTH + C_DDR_BANK_AWIDTH + log2(C_DDR_DWIDTH/8) must be < C_PLB_AWIDTH - 1. Please try again later. all; * Proj 44 ORTHOGONAL CODE CONVOLUTION CAPABILITIES. I am new to VHDL and I can't see a solution to my problem. The working of the ripple counter can be best understood with the help of an example. 4 Synchronous Counters 7. 8 BIT ALU(vhdl) FREQUENCY DIVIDER USING PLL(vhdl) 4 BIT SLICED PROCESSOR (vhdl) IMPLEMENTATION OF ELEVATOR CONTROLLER; Verilog code BCD counter. Shifter Design. The module uses positive edge triggered JK flip flops for the counter. Finite-State Machines 12. [7M] b) Explain the timing diagram of D flip flop and write the VHDL code for D flip flop using data flow modeling. VHDL CODE FOR D-FLIPFLOP USING WAIT STATEMENTS; VHDL CODE FOR CONVERTERS; VHDL Code for Synchronous and Asyncronous counter; VHDL CODE for 8 bit comparator using two 4 bit c Package body Declaration in VHDL February (1) 2013 (5) August (5). 58 in 32-bit (in total 64-bit). Counters are a principle part of nearly every FPGA design, facilitating time tracking in logic circuits by counting clock cycles. You hard-code and optimize this algorithm for a 3-bit case. If an asynchronous reset approach had be used,. The first stage of this design is reset with a synchronous reset. Here is the code for Asynchronous & Synchronous Up-Down Counter in VHDL. all is also required before the entity, like: library IEEE; use IEEE. VHDL code for 16:1 Mux using 4:1 & 8:1 Mux as component structural style. --libraries to be used are specified here. Simulate the module to obtain a timing diagram similar to Figure. Using if then else statement. std_logic_1164. Ic 74193 down counter 4 bit, vhdl program for 4 bit up counter, 4 bit counter using ic 7493 theory, theory of 4 bit counter using ic 7493. Examples of VHDL Descriptions Arithmetic 8-bit Unsigned Multiplier n-bit Adder using the Generate Statement A Variety of Adder Styles Booth Multiplier Registers Universal Register Octal D-Type Register with 3-State Outputs Quad D-Type Flip-flop 8-bit Register with Synchronous Load and Clear Universal Register Description - This design is a universal register which can be used as a. It is a 4-bit synchronous counter, which uses four T-type flip-flops. Again in 32-bit use 16-bit for 36. Here is the code for 4 bit Synchronous UP counter. VHDL Shift Register. That is, as opposed to hard-coding a bit/hex literal - even if you for some reason hard-code the width as you have done, (others => '0') is more standard in this case. VHDL Code for Synchronous Reset. Verilog code for Decoder. numeric_std. At the time of reset the value of the counter is initialized to, say, 0001. This page was last. December 21, 2016 at 1:28 am. VHDL LAB GUIDE FOR LIBERO IDE VER 23 2 Overview Purpose The purpose of this lab is to become familiar with the Actel VHDL design flow For this exercise, we will implement a 16-bit loadable counter with an asynchronous reset and synchronous enable in an AX500 FPGA Tools For this lab, you will use the following tools: • Libero IDE ver 23. Now we are going to construct 16- bit Binary Counter. ALL; entity jkffl is. Design 3-bit Synchronous Counter. The module uses positive edge triggered JK flip flops for the counter. USING MODELSIM TO SIMULATE LOGIC CIRCUITS IN VHDL DESIGNS For Quartus II 13. The clock divider is implemented as a loadable binary counter. Chapter 9: Sequential Logic Modules. all; entity counter is port(C, S : in std_logic; Q : out std_logic_vector(3 downto 0));. State Transition Diagram 3 Bit Counter. ALL; use ieee. Synthesis and implementation of 4-bit Up/Down Counter to Spartan-3E FPGA Board demonstrating correct functionality for the required test cases. VHDL code for displaying 0 to 99 nos. In that respect it has a lot in common with functional programming. parameterized VHDL code (for re-usability). N-bit Adder Design in Verilog. std_logic_1164. c_out is serial data out. Report on D-Flipflop Course project for ECE533. Lab 3: Four-Bit Binary Counter EE-459/500 HDL Based Digital Design with Programmable Logic you must design a synchronous counter version of our fourbit_counter to arrive to a VHDL code - of your entire design. convert ( blinker , fblinker. Bit up/down counter with load able count. The module uses positive edge triggered JK flip flops for the counter. 3 Bit Ripple Counter Vhdl Code For A Jk Iobit Malware Fighter. Setting Up the. STD_LOGIC_1164. sn54160, sn54162, sn74160, sn74162 synchronous 4-bit counters sdls060 – october 1976 – revised march 1988 4 post office box 655303 • dallas, texas 75265. std_logic_1164. Reset is active high and enable is also active high. IO Pins Description C Positive-Edge Clock SLOAD Synchronous Load (active High) Q[3:0] Data Output VHDL Code Following is the VHDL code for a 4-bit unsigned up counter with synchronous load with a constant. The use of IEEE. 16 bit Gray Counter. all; entity counter is port(C, S : in std_logic; Q : out std_logic_vector(3 downto 0));. In this exercise, you will simulate behavioural VHDL code for a Mealy machine that detects non-overlapping occurrences of the pattern "1101" and counts up to at least 100 occurrences. Parametric VHDL counter: my_genpulse. ALL;--entity declaration with port definitions. 3-Bit UP / DOWN Counter ( Structural ) with Test Bench Program FULL ADDER using Two HALF ADDERS and One Or gate (STRUCTURAL) 64 x 1 MULTIPLEXER using 8 x 1 multiplexer (Structural) with the help of "GENERATE". State machines can be defined in VHDL within a CASE statement. And finally it reaches its maximum value, say 1111 in binary for a 4 bit counter, it again reaches 0000 in binary and keeps counting one. 16, 16/32, 32 bit Forths: Pros/Cons? 9. Preset to BCD 7 3. - Design of a binary synchronous counter of a few number of states (FSM strategy, state enumeration). 12 Components. XST User Guide www. The flip-flop will. 04i [web-pack] and simulated on ModelSim PE [student edition], both are readily available over Internet for free. The unit has a 3-bit mode (md) input, an asynchronous reset (rs) input, a 1-bit output control (oc) input, and an 8-bit bi-directional io bus. StopWatch design: We need to instantiate six counters. 4-bit Ripple Carry Counter [Verilog] The following code is designed using Xilinx ISE 7. library ieee; use ieee. In the Verilog code of Example 1a and the VHDL code of Example 1b, a flip-flop is used to capture data and then its output is passed through a follower flip-flop. STD_LOGIC_1164. Synchronous Decade Counter Checkpoint 1: Show your ModelSim simulation of your synchronous JK decade counter and asynchronous D ripple counter to the lab monitor or TA. Verilog code for PWM Generator. synchronous up down counter vhdl code and test ben up counter with preload vhdl code and test bench; d flipflop with setup/hold violation, reset recove d flipflop with asynchronous reset enable and load 4 bit adder/substractor using full adder; 4 bit magnitude comparator vhdl code; Introduction to VHDL. BCD counter and instantiating 3 of them. need vhdl code for 16 bit serial-in, serial-out shift. Operating Conditions: Vcc INT: 3. 3 exercises: structural modeling 95 12. The counter we use is the CMOS Logic CD4029. Blinking LED design example This design consists of a decrementing counter that toggles a one-bit signal whenever it reaches 0. The way to achieve the ability to count in both the directions is by combining the designs for the up and the down counters and using a switch to alternate between them. Notice that in creating a 4-bit counter, you have incidentally created a 1-bit, 2-bit, and 3-bit counter along the way. Write a model for a 4-bit serial in parallel out shift. It can assert and desert a flipflop synchronously. hence changes when they goes from 0 to 1 or at. USING MODELSIM TO SIMULATE LOGIC CIRCUITS IN VHDL DESIGNS For Quartus II 13. zip; Download Counter with Asynchronous Reset README File; The use of this design is governed by, and subject to, the terms and conditions of the Altera Hardware Reference Design License Agreement. A binary counter can represent 2^N states, where N is the number of bits in the code, whereas a straight ring counter can represent only N states and a Johnson counter can represent only 2N states. 3 Bit 4 Up Down Synchronous Counter Youtube. VHDL and Verilog Codes Saturday, 13 July 2013. Consider a 4-bit synchronous counter. Description. Ring Counter. The flip-flop will. Write a VHDL procedure minMax that takes two eight bit inputs and produces two eight bit outputs. Design of 3 : 8 Decoder Using When - Else Statement (Data Flow Modeling Style)- Output Waveform : 3 : 8 Decoder VHDL Code- -- Design of 4 to 1 Multiplexer using if-else statement (VHDL Code). Below is the simple code of testbench without the monitor/checker logic. VHDL Code for up_dn_counter3. Synchronous (Parallel) Counters Synchronous (parallel) counters: the flip-flops are clocked at the same time by a common clock pulse. The counter increments its count on each positive edge of the clock if the Enable signal is asserted. 1 and chapter 6 in Zwolinski. 2 bit adder e. Table of contents for Fundamentals of digital logic with VHDL design / Stephen Brown, Zvonko Vranesic. This example shows two different methods for mapping the lpm_counter function. Yeah I know when you look at the code it's easy to see what the thing is, but imagine you have to browse a 2500 lines vhdl file to figure out what the code does. Counters are sequential circuits that employ a cascade of flip-flops that are used to count something. VHDL and Verilog, for comparison purposes. As you said, I ran my file in a new project file and it was working. as language experts and prime contractor, Texas Instruments as chip design experts and IBM as computer-system design experts. VHDL code for displaying 0 to 99 nos. , frequency counter that generate a control signal of 1sec 4. Use registers to specify a 16-bit counter. If an asynchronous reset approach had be used,. Following is the Verilog code for a 3-bit 1-of-9 Priority Encoder. VHDL for FPGA Design. Jump to navigation Jump to search. 6 a) Explain the operation of 8-bit barrel shifter with a neat diagram. The name of the process holding the code for the state machine is the name of the state machine. VHDL nbit synchronous counter with parallel load input structural design code plus test in circuit ISE Xilinx This video is part of a series which final design is a Controlled Datapath using a structural approach. Reset is active high and enable is also active high. Synchronous Up Counter In the above image, the basic Synchronous counter design is shown which is Synchronous up counter. Please note that some of the following arc names may not be canon. Debounce Logic Circuit (with VHDL example) Browse pages. Generate stimulus waveforms for DUT 3. Note : the code below is compatible with all (decent) synthesis tools (it does not use VHDL 2008 constructs). b) Produce the state table for your design. all; entity counter is Port ( rst,clk : in STD_LOGIC; up: in bit; z : out STD_LOGIC_vector( 2 downto 0 )); end counter; architecture Behavioral of Counter is signal zint: STD. The additional enable input enables (1) or disables (0) counting. The module uses positive edge triggered JK flip flops for the counter. 5, chapter 4, 5. std_logic_unsigned. T Q Clock Q T Q Q Enable Clear T Q Q T Q Q Figure 1: A 4-bit counter. Use skills learned in the previous exercises to build counters. hence changes when they goes from 0 to 1 or at. Could someone please post me how to write 5bit Up/Down Counter with reset and preset in VHDL? VHDL for FPGA Design/4. vhdl code for 4 bit synchronous counter using jk flipflop on code for counter -- can u help me with 4 bit counter pic assembly !!. Synchronous Decade Counter Checkpoint 1: Show your ModelSim simulation of your synchronous JK decade counter and asynchronous D ripple counter to the lab monitor or TA. 3-9 System Model with the Memory and EDAC ch2/fifo. in the code i have simply made a state machine with four state idle read func and write. Objectives, Introduction, Sequential Circuits, NAND Latch, S–R Flip-Flop, D Flip-Flop, J-K Flip-Flop, Edge Triggered S–R Flip-Flop, PRESET and CLEAR Inputs, Shift Register, Binary Counter, Serial or Asynchronous Counter (Ripple Counter), BCD Counter (Mod-10 Counter/Decade Counter), Synchronous Counter (Parallel Counter), VHDL Code for Flip-Flops, Registers and Counters, VHDL Code for D. Bit up/down counter with load able count. In the diagram for the JK flip flop 4 bit counter it had Vdd as the first input to j and k. For the counter to recycle from 1111 to 0000, it takes a total of _____ a) 15 ns b) 30 ns c) 45 ns d) 60 ns View Answer. VHDL code for FIR Filter. Code of a 2-bit comparator 4. Case statements are introduced in VHDL code to realize 7 segment display and comparator. STD_LOGIC_1164. Yeah I know when you look at the code it's easy to see what the thing is, but imagine you have to browse a 2500 lines vhdl file to figure out what the code does. First, we will take a look at the logic circuit of the synchronous up-counter. 7-10 HDL Representation for Shift Registes and Counters— VHDL Ripple counter, Synchronous binary counters, other counters) 3-bit A 2 A 1 A 0 000 001 010 011. There are two types of counters: Each of the higher-order flip-flops are made ready to toggle (both J and K inputs "high") if the Q outputs of all previous flip-flops are "high. In part 1 of this series we focused on the hardware design, including some of the VHDL definitions of the I/O characteristics of the CPLD part. VHDL,verilog,counter,synchronous,asynchronous All 8051 VHDL synthesizeable code for FPGAs Synthesizeable VHDL model of 8051 created by University of California. EDA Tools: Design entry/ synthesis: 4-Bit Synchronous Up Counter 6 Simulation: ModelSim (VHDL) Timing Analysis: None h. The VHDL while loop as well as VHDL generic are also demonstrated. starting from the generic LFSR structure, the VHDL Galois implementation is straightforward as in Figure 2: Figure 2 – 7-bit Galois implementation of an LFSR. VHDL code for 8-bit Microcontroller. Search this site VHDL: BCD up/down counter www. std_logic_1164. Hot Network Questions. 6 Synchronous Up-Down Counter 7. Save the file as: drive: \qdesigns\labs\lab23\ct8bit\ct8bit. So we have to come up with some cleaver and optimized methods to reduce vhdl code size and achieve greater speeds. 3-1 2/27/03 Chapter 3 The Art of VHDL Synthesis 3-3 2/27/03 Synchronous Sets And Resets code segment generates a three-bit shift register. It helps the designer develop testbenches in terms of transactions and cycles. Synchronous Up/Down Counter (JK flipflops) A synchronous 4-bit up/down counter built from JK flipflops. sn54160, sn54162, sn74160, sn74162 synchronous 4-bit counters sdls060 – october 1976 – revised march 1988 4 post office box 655303 • dallas, texas 75265. all; entity srl is port(r,s:in bit; q,qbar:buffer bit); end srl; architecture virat of srl is signal s1,r1:bit; begin q<= s nand qbar; qbar<= r nand q; end virat;. The use of IEEE. VHDL code to simulate 4-Bit Binary Counter by software using spartan 3 Starter Kit Sign up to get notified when this product is back in stock VHDL code to simulate 4-bit Binary Counter by Software. In the diagram for the JK flip flop 4 bit counter it had Vdd as the first input to j and k. A ring counter is a digital circuit with a series of flip flops connected together in a feedback manner. We can design these counters using the sequential logic design process (covered in Lecture #12). 32-bit 5-stage Pipelined MIPS Processor in Verilog (Part-3) 28. Chapter 9: Sequential Logic Modules. ALL; use ieee. Then it comes to programming you can learn a lot by looking at working code. signal TEMP_Q : std_logic_vector(3 downto 0); begin. 3 bit up counter verilog code Home. Count to 8, 9, 0. Your clk-based events are also triggered on both the rising and falling edge of the clock, i. all; entity counter is port(C, S : in std_logic; Q : out std_logic_vector(3 downto 0));. - This web pages (be aware that the naming conventions and procedures are different) are adequate to examine in detail the problem of asynchronous circuits like this counter based on rippling the CLK signal. First the inputs clock, reset are declared as"inputs", since it's for 4bit counter so the output is [3:0] it's a code for synchronus counter where for every positive cycle the counter starts counting. blinker = Blinker ( sys clk freq =100e6 , period =1e 1) print( verilog. I also need to create an input waveform file to test the procedure in a "full count" up and down. The entity section of the HDL design is used to declare the I/O ports of the circuit, while the description code resides within architecture portion. com/39dwn/4pilt. g(x)= x^7+x^6+1. Re: VHDL synchronous vs asynchronous reset in a counter Jump to solution yes thats true it will not impact async and sync reset. The Datasheet Archive vhdl code for 4-bit counter synchronous dual port ram 16*8 verilog code 16x8 dual ram verilog code for image rotation parallel to serial conversion verilog vhdl code for 8 bit ram serial to parallel converter in vhdl XAPP194 vhdl. all; entity counter is port(Clk, Reset : in std_logic; Q : outunsigned(3 downto 0)); endcounter; architectureimp of. Draw the Block Diagram, VHDL code and truth table for the following using process and if statements. For the counter to recycle from 1111 to 0000, it takes a total of _____ a) 15 ns b) 30 ns c) 45 ns d) 60 ns View Answer. Design of MOD-6 Counter using Behavior Modeling Style (VHDL Code). P Washimkar 5 1,2,3,4 Student & department of electronic and telecommunication, Pce Nagpur,Maharashtra ,India. Aside from learning about the on-board clock signal and push-buttons as well as about frequency dividers, this lab reinforces the design flow steps introduced in the previous labs. STD_LOGIC_1164. Therefore, this type of counter is also known as a 4-bit Synchronous Up Counter. 7-28 7-11 Basic Counters Using HDL State Transition. April 24, 2019 By EG Projects. Rather than simply teach VHDL as a programming language, this book emphasizes the practical use of VHDL in the digital design process. 0 of this design used the N-bit Counter's size to determine the time required to validate the button's stability. Debounce Logic Circuit (with VHDL example) Browse pages. 3 N-Bit Adder 7. 6 Operators 19. Write a VHDL code that de fines a 1 6- bit counter by using the structure depicted in Figure 2 and make sure to add comments to your code. General code appearance VHDL code must be indented zMuch easier to read Indentation is fixed inside a project zComment lines are indented like regular code In (X)Emacs VHDL mode, use zCtrl-c Ctrl-b to beautify buffer zCtrl-c ctrl-a Ctrl-b to align buffer Maximum length of a line is 76 characters zIn VHDL language it is very easy to divide lines. You are to implement a 16-bit counter of this type. In a gray code only one bit changes at a one time. 00002 to 11112 (0 to 1510). VHDL CODE FOR D-FLIPFLOP USING WAIT STATEMENTS; VHDL CODE FOR CONVERTERS; VHDL Code for Synchronous and Asyncronous counter; VHDL CODE for 8 bit comparator using two 4 bit c Package body Declaration in VHDL February (1) 2013 (5) August (5). The second method, which is commented out in the example, maps all of the ports on the lpm_counter. port(C, CLR : in std_logic; Q : out std_logic_vector(3 downto 0)); end vhdl_binary_counter; architecture bhv of vhdl_binary_counter is. In a gray code only one bit changes at a one time. It can assert and desert a flipflop synchronously. MSI Counter• 4-bit synchronous counter – edge-triggered – synchronously presettable – cascadable• Typical Count Rate of 35 MHz• ‘160 and ‘162, Mod-10• … Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Rst_a is asynchronous reset signal. 3 Bit Ripple Counter Vhdl Code For A Jk Iobit Malware Fighter. module ripple_counter_4_bit(q,clk,reset); input clk,reset; output[3:0]q; T_FF tff0(q[0],clk,reset); T_FF tff1(q[1],q[0],reset); T_FF tff2(q[2],q[1],reset); T_FF tff3(q[3],q[2],reset. STD_LOGIC_1164. The JK flipflop code used is from my previous blog. hence changes when they goes from 0 to 1 or at. VHDL LAB GUIDE FOR LIBERO IDE VER 23 2 Overview Purpose The purpose of this lab is to become familiar with the Actel VHDL design flow For this exercise, we will implement a 16-bit loadable counter with an asynchronous reset and synchronous enable in an AX500 FPGA Tools For this lab, you will use the following tools: • Libero IDE ver 23. Preset to BCD 7 3. Synthesis and implementation of 4-bit Up/Down Counter to Spartan-3E FPGA Board demonstrating correct functionality for the required test cases. std_logic_unsigned. A behavioralstyle of VHDL code that specifies a gated D latch. The FSM has states (000 through 111) and one input I. Values are as per the DDR2 SDRAM JEDEC standard C_DDR_AWIDTH + C_DDR_COL_AWIDTH + C_DDR_BANK_AWIDTH + log2(C_DDR_DWIDTH/8) must be < C_PLB_AWIDTH - 1. Reloadron Well-Known Member. 3 Bit Counter without clock pin? 10. The test bench program used for testing the design is given below. 4-bit Ripple Counter. now i need to know how i can use another 3 bit counter simultaneously in such a way that while the 1st counter is resetting the 2nd counter counts and while the 2nd counter is resetting the 1st counter counts. in the code i have simply made a state machine with four state idle read func and write. It is a lot good material on web regarding VHDL coding. Jump to navigation Jump to search. VHDL code for displaying 0 to 99 nos. In this counter, the output of the last flip-flop is connected to the input of the first flip-flip. STD_LOGIC_UNSIGNED. eq ( counter 1)) # Create a 10Hz blinker from a 100MHz system clock. Rather than simply teach VHDL as a programming language, this book emphasizes the practical use of VHDL in the digital design process. Of 3 bit up counter in vhdl, theory of 4 bit counter, ic 74193 down counter 4 bit, 4 bit up down counter vhdl testbench, 4-bit counter aim: to write a vhdl program for 4-bit counter and simulate it by using xilinx 8. 3 Other Ripple Counters 7. The way to achieve the ability to count in both the directions is by combining the designs for the up and the down counters and using a switch to alternate between them. port(C, CLR : in std_logic; Q : out std_logic_vector(3 downto 0)); end vhdl_binary_counter; architecture bhv of vhdl_binary_counter is. Answer Save. 2 thoughts on "VHDL Code for 4-Bit Binary Up Counter" September 1, 2017 at 2:30 pm. Counters are found in many places where you might not expect to find them. Synchronous Up/Down Counter (JK flipflops) A synchronous 4-bit up/down counter built from JK flipflops. Presettable synchronous 4-bit binary up/down counter 5. World's Most Famous Hacker Kevin Mitnick & KnowBe4's Stu Sjouwerman Opening Keynote - Duration: 36:30. Re: need VHDL code for 16 bit BCD counter Thank you very much Nand Gates You have saved my project research, because I have tried create BCD counter 64 Bit, it can run successfully (using combination binary counter and comparator bcd) but It can't reset successfully. This indicates what state the state. Write a VHDL code for single digit counter using WAIT UNTIL statement. 8-bit Register with Synchronous Reset Verilog - 3 Verilog - 4 Shift Register Example // 8-bit register can be cleared, loaded, shifted left Verilog - 8. Abstract: 8 BIT ALU design with vhdl code V8-uRISC 8 bit risc microprocessor using vhdl 4 bit microprocessor using vhdl vhdl code for alu low power vhdl code 16 bit microprocessor vhdl code for accumulator 4 bit risc processor using vhdl 4 BIT ALU design with verilog vhdl code. Finite-State Machines 12. The manual also discusses FPGA and CPLD optimization techniques and explains how to run XST from Project Navigator. 3 Other Ripple Counters 7. parameterized VHDL code (for re-usability). 32 bit carry look ahead adder. 25 you have to represent in 32-bit and 24. library ieee; use ieee. Explain the operation of programmable logic devives and write the VHDL code full adder using PLA. Use the code provided in the above example. A suggested skeleton of the VHDL code is shown in parts a and b of Figure 2, and some subcircuit entities that can be used in this code appear in parts c and d. I think each TFF is used to hold a bit, so you will be using 3 TFFs. Download Verilog Download VHDL. 58 in 32-bit (in total 64-bit). registers and register transfer level. -- The dataflow architecture uses the inc function for incrementingthe 4-bit output counter. An example of a 4-bit synchronous up-counter is shown in Figure 5. 16-bit counter question. Presettable synchronous 4-bit binary up/down counter 5. std_logic_1164. INTRODUCTION. The way to achieve the ability to count in both the directions is by combining the designs for the up and the down counters and using a switch to alternate between them. all; entity bit_counter is port ( clk : in std_logic;. next positive clock edge if the synchronous Clear input is low. VHDL and Verilog Codes Saturday, 13 July 2013. Bit is forwarded or shifted on each clock cycle. Structural Verilog code for top-level component. World's Most Famous Hacker Kevin Mitnick & KnowBe4's Stu Sjouwerman Opening Keynote - Duration: 36:30. with the above change now the value for q stays 4'b0000 and if i remove the statement of initializing assign q=4'b0000, i again get 4'bxxxx for q. You might also prefer to rearrange the 4-bit output. std_logic_unsigned. VHDL code for SIPO & PISO with circuit diagram 4. Connecting together carry-out and carry-in lines of several modules will give a counter with multiple digits that count in binary coded decimal. Experiments with different FSM VHDL codes In this section, an example of a finite state machine is synthesized using Xilinx Foundation 2. VHDL code for Priority generator using XOR as component structural 2. The counter. library IEEE; use IEEE. Objective The objective of this lab is to design and test a 4-bit binary counter. One, set up the directories to hold the project. Ring Counter. 4-bit Ripple Counter. How to generate a clock enable signal in Verilog. VHDL - combinational and synchronous logic FYS4220/9220 Reading: 2. Verilog Code For 64 Bit Multiplier. Synchronous modulo-2 N and modulo -M counters are studied in this section, while their asynchronous counterparts are seen in the next. If the question was asking for synchronous counter, then the clocks of the TFFs are tied together. Answer Save. This page of VHDL source code section covers 4 Bit Binary Asynchronous Reset Counter VHDL Code. A 3-bit binary up counter using D-type flip flops is a counter circuit used in the field of digital electronics to count from binary 000 to binary 111, therefore the count is decimal 0 to decimal 7. synchronous up down counter vhdl code and test bench library ieee; use ieee. 4 bit full adder verilog code. Vhdl code for 4 bit updown counter? UP-DOWN COUNTER library IEEE. Pin description Symbol Pin Description D0, D1, D2, D3 15, 1, 10, 9 data input Q0, Q1, Q2, Q3 3, 2, 6, 7 flip-flop output CE 4 count enable input (active LOW) U/D 5 up/down input GND 8 ground (0 V) PL 11 parallel load input (active LOW) TC 12 terminal count output. Model a 4-bit register with synchronous reset and load using the model provided above. --libraries to be used are specified here. Shift registers are a fundamental part of nearly every FPGA design, allowing the ability to delay the flow of data and examine previous values in the architecture pipeline. 4 Bit Serial Adder Vhdl Code >> DOWNLOAD. 4 bit counter 5. It basically separates the time related details from the structural, functional and procedural elements of a testbench. Tutorial 7: Binary Counter in VHDL. The test bench program used for testing the design is given below. VHDL and Verilog Codes Saturday, 13 July 2013. 7 Attributes 19. Find some verilog beginner codes here. Now you would need to instantiate this entity into the BCD counter VHDL main file as it can be hooked-up with BCD counter clock 6. 2 Bit Multiplier Vhdl Code. all; entity counter is port(C, CLR, UP_DOWN : in std_logic; Q : out std_logic_vector(3 downto 0)); end counter; architecture archi of counter is. 2-bit Counter VHDL Code - VLSI Encyclopedia. Pin description Symbol Pin Description D0, D1, D2, D3 15, 1, 10, 9 data input Q0, Q1, Q2, Q3 3, 2, 6, 7 flip-flop output CE 4 count enable input (active LOW) U/D 5 up/down input GND 8 ground (0 V) PL 11 parallel load input (active LOW) TC 12 terminal count output. You are to implement a 8-bit counter of this type. Generate stimulus waveforms for DUT 3. Select File – Create/Update – Create Symbol Files for Current File (three_bit_counter. all; entity vhdl_binary_counter is. Synchronous Counter Operation Synchronous counters have a common clock pulse applied simultaneously to all flip-flops. We have 3 counters modulo-10, 1 counter. It has a synchronous input EO and a clock signal CLK. VHDL Lab Manual Department of E & C, SSIT, Tumkur. In part 3, we will show the entire VHDL design and the associated tests used to prove that we have, in fact, designed what we started out to design. Table of contents for Fundamentals of digital logic with VHDL design / Stephen Brown, Zvonko Vranesic. Then, write VHDL code for a 16-bit serial-in, serial-out shift register using two of these modules. STD_LOGIC_1164. clk is clock signal. pdf: 162: 74162 synchronous 4-bit decade counter with synchronous clear: 74162. synchronous up down counter vhdl code and test bench library ieee; use ieee. Could someone please post me how to write 5bit Up/Down Counter with reset and preset in VHDL? VHDL for FPGA Design/4. } Yes, I was running the code as the top module of my project. The counter has two modes: binary and decade. 4-bit Ripple Counter. Posts about Verilog Code for Ripple Counter written by kishorechurchil. 3 Synchronous Counters with Parallel Load Using INTEGER. -- The dataflow architecture uses the inc function for incrementingthe 4-bit output counter. 4 Pre-defined data types 19. August 16, 2014 August 16, 2014 VB code counter. I am going to design a N-bit ring counter in vhdl. Fundamentals of Digital Logic Design with VHDL (Hardcover) ISBN-13: 9780981619446, 5. SYNCHRONOUS COUNTER USING T FLIPFLOP VHDL In the VHDL program the Q outputs were defined for the k,l,m AND. Design of 4 Bit Binary Counter using Behavior Modeling Style - Output Waveform : 4 Bit Binary Counter Design of 4 Bit Binary Counter using. A 4−bit synchronous up−counter. Is it a three bit binary counter or gray counter or what. VHDL Code for 4-Bit Down-Counter: library ieee; use ieee. Lab 3 - Design of a 4-bit Even-Odd Up/Down Counter. ALL; use IEEE. VHDL Code for Synchronous Reset. This banner text can have markup. VHDL Code For 3-bit Gray Code Counter October (1) July (2) March (1) January (1) 2016 (4) December (4) Simple theme. VHDL and Verilog Codes Saturday, 13 July 2013. Shift registers are a fundamental part of nearly every FPGA design, allowing the ability to delay the flow of data and examine previous values in the architecture pipeline. Three, simulate the project. It helps the designer develop testbenches in terms of transactions and cycles. VHDL CODE FOR D-FLIPFLOP USING WAIT STATEMENTS; VHDL CODE FOR CONVERTERS; VHDL Code for Synchronous and Asyncronous counter; VHDL CODE for 8 bit comparator using two 4 bit c Package body Declaration in VHDL February (1) 2013 (5) August (5). 16 bit Gray Counter. 3 bit up counter verilog code. The JK flipflop code used is from my previous blog. VHDL Code for 4-Bit Down-Counter: library ieee; use ieee. all; entity synchronous_reset is port (clock, Reset, data: Std_logic; q: std_logic); end synchronous_reset; architecture bhv of synchronous_reset is begin. library ieee; use ieee. It hads a 4 line input (A) a 10Hz CLK input a load input which is asynchronous a UP/Down (Down is Not down) and is synchronous a Reset input which is asynchronous a 2 line setect input line (x) a 2 line setect input line (y) a 4 line output (count) a one line output called (xeq Y) Does anyone know the code. Could someone please post me how to write 5bit Up/Down Counter with reset and preset in VHDL? VHDL for FPGA Design/4. VHDL code for FIFO memory. Rst_a is asynchronous reset signal. com-- ~ ---- ~ Description: This is synchronous 4-bit BCD counter-- ~ with possibility to count UP or DOWN. A ring counter is a digital circuit with a series of flip flops connected together in a feedback manner. Your clk-based events are also triggered on both the rising and falling edge of the clock, i. There are lengthy guides. Digital Counters, as the name suggests, are digital circuits used for counting occurrence of any event. This design code has two inputs clock and reset signals and one four bit output that will generate gray code. In part 3, we will show the entire VHDL design and the associated tests used to prove that we have, in fact, designed what we started out to design. all; entity bit_counter is port ( clk : in std_logic;. 4 Synchronous Counters 7. The second method, which is commented out in the example, maps all of the ports on the lpm_counter. Debounce Logic Circuit (with VHDL example) Browse pages. the code for jk module is for a master slave jk flipflop. Memory Array Read/Write Control, rising edge clock sensitive Counter with Control Flags, combinational control Output Register Connections The RTL diagram for a 24-bit data, 4-bit address space, with 4 word deep “almost full” and “almost empty” flags can be found in Figure 3 below. std_logic_1164. This page of Verilog source code section covers 4 Bit Binary Synchronous Reset Counter Verilog Code. all; entity counter is port(Clk, Reset : in std_logic; Q : outunsigned(3 downto 0)); endcounter; architectureimp of. In the diagram for the JK flip flop 4 bit counter it had Vdd as the first input to j and k. 0 of this design used the N-bit Counter's size to determine the time required to validate the button's stability. std_logic_unsigned. 4-Bit Binary Counter with Synchronous Clear General Description The VHC163 is an advanced high-speed CMOS device fabricated with silicon gate CMOS technology. Thus, with. Explains how to write VHDL code for 4 bit counter and mod 10 counter. The module definition includes the clock reset a Serial data in D zero shift input and the 4-bit Q output Q 3 could also be considered the serial output. parameterized VHDL code (for re-usability). Timing diagram of Asynchronous counter For example, if the present count = 3, then the up counter will calculate the next count as 4. Jun 26, 2017 - VHDL code for counters with testbench, VHDL code for up counter, VHDL code for down counter, VHDL code for up-down counter Stay safe and healthy. port(C, CLR : in std_logic; Q : out std_logic_vector(3 downto 0)); end vhdl_binary_counter; architecture bhv of vhdl_binary_counter is. Find some verilog beginner codes here. 3 bit up counter verilog code Home. In a gray code only one bit changes at a one time. Help: Bit Planing in VGA 16 (640 x 480 x 16) 10. Present State (Q) Next State (Q+) The characteristic equation for the D-FF is: Q+ = D. We need to design a 4 bit up counter. 3-bit Synchronous Counter: a) Draw the state diagram for a 3-bit synchronous counter with an asynchronous reset signal, R, which resets the counter to state `000’ when it is asserted. I need help mostly with the BCD counter that has a reset, enable, and sec input and that goes to the bcd to 7-seg part Laboratory Exercise 5 Implement a 3-digit BCD counter. 2 Bit Multiplier Vhdl Code. For example you have a number 36. Now we are going to construct 16- bit Binary Counter. Three, simulate the project. 7-28 7-11 Basic Counters Using HDL State Transition. Note : the code below is compatible with all (decent) synthesis tools (it does not use VHDL 2008 constructs). Each flip-flop constitutes a stage. Explains how to write VHDL code for 4 bit counter and mod 10 counter. 4-bit Ripple Carry Counter [Verilog] The following code is designed using Xilinx ISE 7. 01 IN0 01 IN1 01 IN2 01 IN3 Load 12 Modulo-7 Counter • Suppose an 3-bit up. It then becomes 0010 at the next clock cycle - and this keeps going on. But it is also possible to use the basic asynchronous counter configuration to construct special counters with counting states less than their maximum output number. Verilog - 13 Restricted FSM Implementation Style ˙ " ! ! ˙˝ % )7 ˙˝ % i % ˙ ˙˝ ˙ r ˙ !. Programming & Languages It is a lot good material on web regarding VHDL coding. Yeah I know when you look at the code it's easy to see what the thing is, but imagine you have to browse a 2500 lines vhdl file to figure out what the code does. 16 bit Gray Counter. Circuit Diagram for 4-bit Synchronous up counter using T-FF : Verilog code for tff: (Behavioural model) module tff(t, 4-Bit Array Multiplier using structural Modeling Verilog Code for Basic Logic Gates in Dataflow Modeling. the code for jk module is for a master slave jk flipflop. Let's draw the state diagram of the 4-bit up counter. Fig – 2, BCD counter, a 7 segment display decoder and a. To Design 16 bit Synchronous Microprocessor using VHDL on FPGA Abhilash Wanjari 1 , Nihal Bisen 2 , Mohan Chaudhari 3 , Sujay Rajak 4 , S. std_logic_1164. 1 Up/Down Binary Counter 28 2. 3 Fundamental libraries and packages 19. all; entity counter is port(C, CLR, UP_DOWN : in std_logic; Q : out std_logic_vector(3 downto 0)); end counter; architecture archi of counter is. MOD-16 for a 4-bit counter, (0-15) making it ideal for use in Frequency Division applications.