This page contains tidbits on writing FSM in verilog, difference between blocking and non blocking assignments in verilog, difference between wire and reg, metastability, cross frequency domain interfacing, all about resets, FIFO depth calculation,Typica
照惯例,还是先将官方说明贴出来,verilog 2001关于blocking and non-blocking assignment 表述如下: blocking assignment :A blocking procedural assignment statement shall be executed before the execution of the statements that follow it in a sequential block (see 9.8.1). A blocking procedural assignment state...
So for 10 time units, other assign statements in this initial block are blocked from execution. After 10 time units, p is assigned value of 1'b1. Right after that, it is time for the next blocking assign statement q = #30 1'b0;Again this blocks any statement from execution, this thi...
Now all this works fine using "=" blocking statement at the expense of huge combinational blocks.I was wondering if this can be done using non-blocking statements as it would greatly enhance frequency of operation. Thanks.« Last Edit: October 06, 2022, 03:27:05 am by knight » Logged...
1.A blocking procedural assignment statement shall be exectuted before the execution of the statements that follow itin a sequential block (我们一般都这样用) 2.A blockingprocedural assignment statement shall not prevent the execution of statements that follow itin a parallel block(看来阻塞赋值不是...
Usind the non blocking statement a <= a<<1, it is shifted towards left by 1. But before this execution blocks the execution of the next statement a[0] <=a[3]; we want to assign [a3]'s value to a[0]. If we write the blocking statements in place of non blocking as in ...
Verilog HDL: Digital Design and Modeling Implicit Continuous Assignment Delays Problems BEHAVIORAL MODELING Procedural Constructs Initial Statement Always Statement Procedural Assignments Intrastatement Delay Interstatement Delay Blocking Assignments Nonblocking Assignments Conditional Statement Case... J Cavanagh 被引...
And as I said, they are mainly a convenience. This allows you to split expressions in a more readable way, and/or factor expressions. Simple example (VHDL, but that should be exactly the same with Verilog using the right syntax - VHDL variable assignment is ":="): ...
Verilator is failing a simulation that Questa and VCS are passing. I eventually tracked the discrepancy down to a cache with four ways, each containing tag memories. The Verilog writes to the memory in way 0. In Questa, the way 0 memory changes. In Verilator, the way 2 memory changes....
In the test bench I have two instances of the module, one is driven by the test bench using blocking assignments (test_inc1), and the other is driven by an always statement using non-blocking assignments (test_inc2). In the output, the blocking assignments increment the counter twice - ...