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How does the positive edge detector in Verilog work?
The design aims to detect the positive edge of input sig, and output pe. So we expect to see a pulse on pe whenever sig changes from value 0 to 1. We create an internal signal called sig_dly of type reg that can store a single clock cycle delayed version of sig, and is achieved by the always block.
Is it good practice to compile and simulate Verilog?
Assuming you are designing hardware and not non-synthesized testbench code, this not a good practice and likely won’t do what you want anyways. From a language perspective, this will compile and simulate. It will block waiting on the events within the always blocks and NOT restart on each posedge of the clock.
How is output PE assigned in Verilog chipverify?
Output pe is an implicit variable of type wire and can be assigned only by a continous assignment. Hence we have used the assign statement to assign an expression to pe. The expression simply takes sig and does a logical AND with the inversion of sig.
Are there any target specific answers to Verilog questions?
Answers to many Verilog questions are target specific. Learn more… Top users Synonyms 1,588 questions Newest Active Bountied Unanswered More Bountied 0
What do you need to know about Verilog block?
I have a basic Verilog block that I wrote to trigger on any change in the signal. I expected this to trigger on the rising or falling edge of the trigger. Instead, it tied data_out to data_in. Even when the trigger was in steady state, the output was changing with the input. What am I missing here?
Can a double edge flop be identified in SystemVerilog?
If you don’t follow the synthesizers requirements for identifying a double edge flops then it could infer one of the edges as asynchronous set/reset level trigger. SystemVerilog did simplify the clocking for double edge events.
Why does Verilog not support double edge clocking?
There will be an issue when synthesizing, which will generate pass through behavior instead of being clocked via double edge. Most synthesizers do not support double edge clocking and those that do often require special setup and restriction. Refer to the manual and other documentation from the synthesizer/FPGA.
When to expect a pulse on PE in Verilog?
So we expect to see a pulse on pe whenever sig changes from value 0 to 1. We create an internal signal called sig_dly of type reg that can store a single clock cycle delayed version of sig, and is achieved by the always block. Output pe is an implicit variable of type wire and can be assigned only by a continous assignment.
How is a clock generated in Verilog simulator?
Clock for our design is generated by the always block which toggles clk every 5 time units, there by generating a clock with period = 10 time units. Basic design stimulus is written within the initial block which makes the simulator advance in time and drive the design with specific values appropriately.
When do you use assertions in SystemVerilog?
SystemVerilog Assertions : Assertions are a useful way to verify the behavior of the design. Assertions can be written whenever we expect certain signal behavior to be True or False. Assertions help designers to protect against bad inputs & also assist in faster Debug.