![]() With your example, I think the single always block is most obvious and readable, so that should be preferred. ![]() Thus don't write hardware tailored code with the purpose of utilizing resources the best way, except if you are aware of a specific problem, which is probably not the case with your example code. The purpose of having an advanced synthesis/simulation tool is that the tool handles the tedious task of using resources the best way, so you can write the code the easy way. Evaluate b&(c), assign result to z Blocking vs. Contain hierarchy of reconfigurable interconnects that allow the blocks to be wired together. Evaluate b&(c) but defer assignment of z 1. FPGAs contain programmable logic components called logic blocks. Evaluate abc but defer assignment of y 3. Evaluate a b but defer assignment of x 2. ![]() Use blocking assignment for combinatorial logic, and non-blocking assignment for sequential design to avoid race conditions between different always blocks driven by the same clock.įinally, benefit from using an advanced synthesis/simulation tool, and write the code in a way that is most obvious and readable, in order to reduce risk of bugs, and make future maintenance easier. L5: 6.111 Spring 2004 Introductory Digital Systems Laboratory 7 1. You two examples already adhere to this rule. Each always block should either implement combinatorial logic or sequential design, but the sequential design may contain expressions that result in combinatorial logic, as long as the result that is assigned is either combinatorial logic or sequential design for all results of the always block. The circuit under consideration is an 8 bit. Each always block should either implement combinatorial logic or sequential design, but the sequential design may contain expressions that result in combinatorial logic, as long as the result that is assigned is either combinatorial logic or sequential design for all results of the always block. We are going to look at using structured design of synthesizable always blocks to implement sequential logic. ![]()
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