4 Bit Serial In Parallel Out Shift Register Verilog Code Blocks !FULL!

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

4 Bit Serial In Parallel Out Shift Register Verilog Code Blocks

In this post, we analyzed the VHDL code for a parallel to serial converter. This approach is very useful in interfacing different devices. Many FPGA vendors like Xilinx, Intel/Altera give us the possibility to use internal serializer-deserializer such as a serial transceiver. In this post, we want to implement the complementary interface of the parallel to serial interface. We will see how to implement the VHDL code for a serial to parallel interface in order to get back the parallel data bus we sent in the transmitter device. In other words, we will implement the VHDL block in the of the bottom right of Figure1

Let assume the parallel data bus of the Serial to Parallel converter to be N bit. The parallel output to the module will be available every N clock cycle since N clock cycles are needed to load the shift register that provided the parallel output as in Figure2

In the VHDL code every G_N clockcycles the counter enable the parallel output register and provides theparallel data output and the relative enable pulse. With respect to theparallel to serial converter in this case no error detection logic is present.The output parallel data rate is slower than the input serial data rate, so noerror condition can occur.

In Figure4 is reported a simulation of the serial to parallel converter VHDL code above. In order to realize the test bench, the parallel to serial converter of this post is used. As a convention, the first serial output bit is the MSB of the input parallel data. You can choose to output first the LSB. It depends on the convention you are using.

In this post, we implemented a simple example of a serial to parallel VHDL code. Such a conversion strategy can be used when we need to connect two different devices like two FPGA, and we need to minimize the connection wires. Using a serial connection, we can minimize the number of connection wires, minimizing also the skew problem on the connection itself. This module can be used in conjunction with the serial to parallel converter discussed in this post.

The following image shows an n-bit bidirectional shift register with serial data loading and retrieval capacity. Initially, all the flip flops in the register are reset by driving their clear pins high.

The logic circuit given below shows a parallel-in-parallel-out shift register. The circuit consists of four D flip-flops which are connected. The clear (CLR) signal and clock signals are connected to all the 4 flip flops.

When the shift/load bar line is low (1), the AND gates 2, 4 and 6 become inactive.Hence, the parallel loading of the data becomes impossible.But the AND gates 1,3 and 5 become active.Therefore the shifting of data takes place from left-to-right bit-by-bit on the application of clock pulses.Thus, the parallel-in serial-out operation takes place.

In this shift register, we can send the bits serially from the input of left most D flip-flop. Hence, this input is also called as serial input. For every positive edge triggering of clock signal, the data shifts from one stage to the next. So, we can receive the bits serially from the output of right most D flip-flop. Hence, this output is also called as serial output.

In this shift register, we can send the bits serially from the input of left most D flip-flop. Hence, this input is also called as serial input. For every positive edge triggering of clock signal, the data shifts from one stage to the next. In this case, we can access the outputs of each D flip-flop in parallel. So, we will get parallel outputs from this shift register.

In this shift register, we can apply the parallel inputs to each D flip-flop by making Preset Enable to 1. For every positive edge triggering of clock signal, the data shifts from one stage to the next. So, we will get the serial output from the right most D flip-flop.

In this shift register, we can apply the parallel inputs to each D flip-flop by making Preset Enable to 1. We can apply the parallel inputs through preset or clear. These two are asynchronous inputs. That means, the flip-flops produce the corresponding outputs, based on the values of asynchronous inputs. In this case, the effect of outputs is independent of clock transition. So, we will get the parallel outputs from each D flip-flop.

Shift register are the registers which are used to shift the stored bit in one or both directions. In this section, shift register is implemented which can be used for shifting data in both direction. Further it can be used as parallel to serial converter or serial to parallel converter. VHDL files required for this example are listed below,