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1. Nov. 2015 · Simple difference between reg and wire is, the reg is used in combinational or sequential circuit in verilog and wire is used in combinational circuit. reg is used to store a value but wire is continuely driven some thing and wire is connected to outport when module initialization but reg is con not connected. answered Mar 23, 2017 at 23:38.
11. Okt. 2014 · What is the difference between >> and >>> in verilog/system verilog? I know that == tests for only 1 and 0, while === tests for 1, 0, X, Z. So how is that similar to the shift operator? Skip to main content. Stack Exchange Network. Stack ...
12. Dez. 2014 · 1) <= non-blocking and is performed on every positive edge of clock. these are evaluated in parallel so no guarantee of order. An example of this would be a register. 2) assign = continual assignment to wire outside an always statement. value of LHS is updated when RHS changes. 3) = blocking assignment, inside always statements enforces ...
24. Nov. 2013 · However, the distinction between time-sequential and parallel makes absolutely no difference in this case because the always_comb block is defined to repeat until the instruction sequence converges on a stable state -- which is exactly what the hardware circuitry will do (if it meets the timing requirements).
The RHS of every non-blocking statement of a particular time-step is captured, and moves onto the next statement. The captured RHS value is assigned to the LHS variable only at the end of the time-step. Simulation Log. ncsim> run. [0] a= 0xx b= 0xx c= 0xx. [0] a= 0xx b= 0xx c= 0xx. [0] a= 0xx b= 0xx c= 0xx.
6. Apr. 2016 · In other words: !a means " a is not 0". ~a means "invert the bits of a ". For you second question: The first code snippet is wrong. You can't use non blocking assignments for sequential logic. If you need combinatorial logic: always @(x, y, Q1, z) # or always @(*) begin.
In my knowledge, the "assign" statement is a "Procedural Continuous assignment". For example, the output of a transparent latch will follow the data input when the latch is enabled, but when the latch is disabled, it must ignoew any changes on its data input and retain its last output value until it is again enable.
