In my code I am using the following sensitivity list declaration. Problem: This code never enters the always @( * ) block - thus the supply check always fails (supplyOk=0): //checking supply `ifdef SUPPLYCHKOFF logic supplyOk = ...
下面的并列例子对比了传统Verilog的always块和SystemVerilog的always_comb块: 相较always,always_comb的第一个好处就是工具能知道过程块意图,因而能推出组合性的敏感列表(combinatorial sensitivity list)。敏感列表不完整是传统Verilog非常常见的一个编码错误,且由于并非语法错误,会导致RTL仿真行为与综合后门级行为的不一致。
2. always @(*) can result in an incomplete sensitivity list if the functions called inside the block do not have a complete formal argument. 3. always @(*) does not check if the contents adhere to combinational logic semantics and give warnings otherwise Parametrized The key to increase reus...
SystemVerilogalways_combsolves this limitation. It improves uponalways @*in some other ways as well: always_combautomatically executes once at time zero, whereasalways @*waits until a change occurs on a signal in the inferred sensitivity list. always_combis sensitive to changes within the contents...
always_comb must correctly infer the sensitivity list. I do wonder why you're using "modport hierarchical naming" at the level of the interface instanciation. It's unnecessary here. The port directions don't apply at this level. There's no reason why not to just use t...
Figure 16 - Address decoder with unwanted latches The easiest way to eliminate latches is to make initial default value assignments to all outputs immediately beneath the sensitivity list, before executing the case statement, as shown in Example 9. The correctly synthesized logic is shown in ...
Verilog always block is a procedural statement that starts an activity flow. It is essentially an infinite loop. However, when combined with a Verilog event expression, it can be used to model combinational and sequential logic. Share this: ...
SystemVerilogalways_combprocesses are designed for this purpose and automatically work out what signals will trigger the process, so the designer does not have to add a sensitivity list in the code. Designers sometimes inadvertently infer latches when they write HDL code for their combinational ...
EN首先简单介绍下 strpos 函数，strpos 函数是查找某个字符在字符串中的位置，这里需要明确这个函数的作用...
V erilog H DL与SystemC的语法等效性Ξ 张雅绮,王 琨,崔志刚 (天津大学电子信息工程学院,天津300072)摘 要:针对电子系统设计中使用不同语言制约设计效率的问题,研究了SystemC2.0与Verilog HDL的语法在基本语法结构、时间模型、等待和事件模型、调度模型等方面的等效性,得出如下结论:对于门级以上级别的描述,所有...