I'm implementing a repeating bit shifter for a 16 bit number. To do this, I have a bit counter that counts how many times I've shifted and resets when I reach 4'b1111. Then I have an assign statement that feeds the MSB to an output. However, the logic makes it so that the output skips the first MSB every time. What is the most succinct way to include the first MSB, before any shifting has occurred?
Firstly it would be better to have a trigger to capture the data_in. If not then in simulation ,if the data_in changes in between the shifting it will update the shifter and cause the expected output to change. It would be preferable to capture the data_in based on a qualifying event ( e.g. counter_enable in the example below) . Synthesis will produce an error as shifter has two drivers . One the continuous assignment shifter
4 Bit Serial In Serial Out Shift Register Verilog Code Of Counter
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In digital electronics, a shift register is a cascade of flip-flops where the output pin q of one flop is connected to the data input pin (d) of the next. Because all flops work on the same clock, the bit array stored in the shift register will shift by one position. For example, if a 5-bit right shift register has an initial value of 10110 and the input to the shift register is tied to 0, then the next pattern will be 01011 and the next 00101.
This shift register design has five inputs and one n-bit output and the design is parameterized using parameter MSB to signify width of the shift register. If n is 4, then it becomes a 4-bit shift register. If n is 8, then it becomes an 8-bit shift register.
This shift register has a few key features:Can be enabled or disbled by driving en pin of the designCan shift to the left as well as right when dir is drivenIf rstn is pulled low, it will reset the shift register and output will become 0Input data value of the shift register can be controlled by d pin
The testbench is used to verify the functionality of this shift register. The design is instantiated into the top module and the inputs are driven with different values. The design behavior for each of the inputs can be observed at the output pin out.
The time when shift register is enabled is highlighted in green in the log given below. The time when it shifts its direction is highlighted in yellow. The time when data input pin remains constant is highlighted in blue.
I think this module implements what Josh was describing. This module will create two registers, a counter register (counter_reg) and a shift register (leds_reg). The counter register will increment once per clock cycle until it rolls over. When it rolls over, the "tick" variable will be equal to 1. When this happens, the shift register will rotate by one position to the left.
In the idea of start simple, if you load a 20 bit shift register with "11111111111010110100", and then send out a right-most bit every baud tick before you roll the shift register to the right. You should get ASCII 5A - a capital Z - on the output pin.
Please note that I have implemented this shift register such that we can replace a section with the generate block. In practice, you may implement this a bit more concisely. This is optimized instead for clarity. The output of this module will be 8 0's, then 8 1's, then 8 0's, etc. 589ccfa754
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