The following are some of useful verilog examples.//--> Verilog code for flip-flop with a positive-edge clock Verilog code for a flip-flop with a negative-edge clock and asynchronous clear Verilog code for the flip-flop with a positive-edge clock and synchronous set Verilog code for the flip-flop with a positive-edge clock and clock enable Verilog code for a 4-bit register with a positive-edge clock, asynchronous set and clock enableVerilog code for a latch with a positive gate Verilog code for a latch with a positive gate and an asynchronous clear. Verilog code for a 4-bit latch with an inverted gate and an asynchronous preset. Verilog code for a tristate element using a combinatorial process and always block. Verilog code for a tristate element using a concurrent assignment. Verilog code for a 4-bit unsigned up counter with asynchronous clear. Verilog code for a 4-bit unsigned down counter with synchronous set. Verilog code for a 4-bit unsigned up counter with an asynchronous load from the primary input. Verilog code for a 4-bit unsigned up counter with a synchronous load with a constant. Verilog code for a 4-bit unsigned up counter with an asynchronous clear and a clock enable. Verilog code for a 4-bit unsigned up/down counter with an asynchronous clear. Verilog code for a 4-bit signed up counter with an asynchronous reset. Verilog code for a 4-bit signed up counter with an asynchronous reset and a modulo maximum. Verilog code for a 4-bit unsigned up accumulator with an asynchronous clear. Verilog code for an 8-bit shift-left register with a positive-edge clock, serial in and serial out. Verilog code for an 8-bit shift-left register with a negative-edge clock, a clock enable, a serial in and a serial out. Verilog code for an 8-bit shift-left register with a positive-edge clock, asynchronous clear, serial in and serial out. Verilog code for an 8-bit shift-left register with a positive-edge clock, a synchronous set, a serial in and a serial out. Verilog code for an 8-bit shift-left register with a positive-edge clock, a serial in and a parallel out 8-bit shift-left register with a positive-edge clock,an asynchronous parallel load, a serial in and a serial out Verilog code for an 8-bit shift-left register with a positive clock,a synchronous parallel load,a serial in and a serial out Verilog code for an 8-bit shift-left/shift-right register with a positive-edge clock, a serial in and a serial out Verilog code for a 4-to-1 1-bit MUX using an If statement. Verilog Code for a 4-to-1 1-bit MUX using a Case statement. Verilog code for a 3-to-1 1-bit MUX with a 1-bit latch. Verilog code for a 1-of-8 decoder Verilog code leads to the inference of a 1-of-8 decoder Verilog code for a 3-bit 1-of-9 Priority Encoder Verilog code for a logical shifter Verilog code for an unsigned 8-bit adder with carry in Verilog code for an unsigned 8-bit adder with carry out Verilog code for an unsigned 8-bit adder with carry in and carry out Verilog code for an unsigned 8-bit adder/subtractor Verilog code for an unsigned 8-bit greater or equal comparator Verilog code for an unsigned 8x4-bit multiplier Verilog template shows the multiplication operation placed outside the always block and the pipeline stages represented as single registers Verilog template shows the multiplication operation placed inside the always block and the pipeline stages are represented as single registers Verilog template shows the multiplication operation placed outside the always block and the pipeline stages represented as single registers Verilog template shows the multiplication operation placed inside the always block and the pipeline stages are represented as single registers Verilog template shows the multiplication operation placed outside the always block and the pipeline stages represented as shift registers Use templates to implement Multiplier Adder with 2 Register Levels on Multiplier Inputs in Verilog Verilog code for resource sharing single-port RAM in read-first mode single-port RAM in write-first mode single-port RAM in no-change mode single-port RAM with asynchronous read single-port RAM with "false" synchronous read single-port RAM with synchronous read (read through) Verilog code for a single-port block RAM with enable Verilog code for a dual-port RAM with asynchronous read Verilog code for a dual-port RAM with false synchronous read Verilog code for a dual-port RAM with synchronous read (read through) Verilog code for a dual-port RAM with enable on each port Verilog code for a ROM with registered output Verilog code for a ROM with registered address Verilog code for an FSM with a single process Verilog code for an FSM with two processes Verilog code for an FSM with three processes Top Following is the Verilog code for flip-flop with a positive-edge clock.module flop (clk, d, q);input clk, d;output q;reg q; always @(posedge clk)begin q
The default settings generate a fully parallel architecture. There is a dedicated multiplier for each filter tap in direct form FIR filter structure and one for every two symmetric taps in symmetric FIR structure. This results in a lot of chip area (78 multipliers, in this example). You can implement the filter in a variety of serial architectures to obtain the desired speed/area trade-off. These architecture options are shown in further sections of this example.
8 Bit Serial Multiplier Verilog Code
Download File: https://disptaxrenru.blogspot.com/?file=2vGHkc
Serial architectures present a variety of ways to share the hardware resources at the expense of increasing the clock rate with respect to the sample rate. In FIR filters, we will share the multipliers between the inputs of each serial partition. This will have an effect of increasing the clock rate by a factor known as folding factor.
You can use the hdlfilterserialinfo function to get information regarding various filter lengths based on the value of coefficients. This function also displays an exhaustive table of possible options to specify SerialPartition property with corresponding values of folding factor and number of multipliers.
In fully serial architecture, instead of having a dedicated multiplier for each tap, the input sample for each tap is selected serially and is multiplied with the corresponding coefficient. For symmetric (and antisymmetrical) structures the input samples corresponding to each set of symmetric taps are preadded (for symmetric) or pre-subtracted (for anti-symmetric) before multiplication with the corresponding coefficients. The product is accumulated sequentially using a register and the final result is stored in a register before the next set of input samples arrive. This implementation needs a clock rate that is as many times faster than input sample rate as the number of products to be computed. This results in reducing the required chip area as the implementation involves just one multiplier with a few additional logic elements like multiplexers and registers. The clock rate will be 78 times the input sample rate (foldingfactor of 78) equal to 3.4398 MHz for this example.
To implement fully serial architecture, use the hdlfilterserialinfo function and set the 'Multipliers' property to 1. You can also set the 'SerialPartition' property equal to the effective filter length, which in this case is 78. The function also returns the folding factor and number of multipliers used for that serial partition setting.
Let us assume that you want to implement this filter on an FPGA which has only 4 multipliers available for the filter. You can implement the filter using 4 serial partitions, each using one multiply accumulate circuit.
You designed a lowpass direct form symmetric FIR filter to meet the given specification. You then quantized and checked your design. You generated VHDL code for fully parallel, fully serial, partly serial and cascade-serial architectures. You generated a VHDL test bench using a DTMF tone for one of the architectures.
You can use an HDL simulator to verify the generated HDL code for different serial architectures. You can use a synthesis tool to compare the area and speed of these architectures. You can also experiment with and generating Verilog code and test benches.
2ff7e9595c
Comments