WebMar 13, 2013 · So in your case, 1) has a problem because the always wants to run and the initial wants to run at the same time, causing a problem. 2) works because the always doesnt run until clock changes, which is does so when the initial block sets clk to 0. Then the always block detects a change in clock and flips it to a '1'. WebOct 12, 2024 · Loops in Verilog. We use loops in verilog to execute the same code a number of times. The most commonly used loop in verilog is the for loop. We use this loop to execute a block of code a fixed number of times. We can also use the repeat keyword in verilog which performs a similar function to the for loop.
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WebMay 11, 2016 · In Verilog, the term register merely means a variable that can hold a value. Unlike a net, a register does not need a driver. Verilog registers do not need a clock as hardware registers do. Values ... WebSep 8, 2024 · The difference between the two is that initial processes execute once, whereas always process execute repeatedly forever. As such, an always process must contain timing statements that will occasionally block execution and allow time to advance (time in initial and always process only advances when they are blocked). now jacksonchapelchurch
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WebJul 7, 2016 · According to the IEEE Verilog Standard, the two always blocks can be scheduled in any order. If the first always block executes first after a reset, both y1 and y2 will take on the value of 1. If the second always block executes first after a reset, both y1 and y2 will take on the value 0. This clearly represents a Verilog race condition. WebAug 17, 2007 · 1,862. OK, avimit. The parallel block in Verilog is really unsynthesizable and is used for simulation purposes only. Finally I have clarified this question for me. I did some experiments with ModelSim simulator, tried all 4 available combinations of 2 considered Verilog constructs: parallel/sequential blocks and blocking/non-blocking assignments. WebMay 3, 2024 · 1 Answer Sorted by: 0 You have a race condition between your initial and always block. Both of them start at time 0, but simulation will choose one or the other to go first. If the initial block goes first, data changes first before the always @* executes and … nicole lindsey scholarship