Verilog 支持两种赋值 :过程赋值(procedural) 和连续赋值(continuous)。过程赋值用于过程代码 initial, always, taskorfunction)中给reg 和 integer变量 time ealtimereal赋值, 而连续赋值一般给wire 变量赋值。 Always @(敏感表 敏感表要完整 如果不完整 将会引起仿真和综合结果不一致 always @(d or Clr) if (Cl...
10. 避免使用门控时钟 使用门控时钟(Gated clock)不利于移植,可能引起毛刺,带来时序问题,同时对扫描链的形成带来问题。门控钟在低功耗设计中要用到,但通常不要在模块级代码中使 用。可以借助于Power compiler来生成,或者在顶层产生。 11. 避免使用内部产生的时钟 在设计中最好使用同步设计。如果要使用内部时钟,可...
3、过程连续赋值语句(Procedural Continuous Assignments) 过程连续赋值是在过程块内对变量或线网型数据进行连续赋值,是一种过程性赋值。换言之,过程性连续赋值语句是一种能够在always或initial语句块中出现的语句。 这种赋值可以改写(Override)所有其他语句对线网或者变量的赋值。
2.difference betweenprocedural assignmentsandcontinuous assignments (1)continuous assignments drivenetsandare evaluated and updated whenever an input operand changes value. (2)procedural assignments update the value ofvariablesunder the control of the proceduralflow constructsthat surround them. ...
Verilog有两种赋值方式:过程赋值(procedural)和连续赋值(continuous).过程复制用于过程代码(initial,always,task,function)中给reg和integer变量,time ealtime eal复制,而连续赋值一般给wire变量赋值. always@(敏感表),敏感表要完整,如果不完整,将会引起仿真和综合结果不一致,如: ...
The assigned value forinoutport cannot be of typereg. Even though you have used the procedural continuous assignment to set the value ofassign, it is not allowed for this type of port. Instead, you must use continuous assignment. This applies toinoutports. The same rule applies to your cod...
A key feature of Verilog syntax is the use of procedural and continuous assignments, that are used to: Describe the behavior of a digital system Model the combinational logic and relationship between various signals. Here's an example of a simple Verilog module that implements a 2-input AND ga...
44、 CO) ;input A, B, CI;output S, CO;reg S, CO; / assignment made in an always block / must be made to registers/ use procedural assignmentsalways(A or B or CI) begin S = A B CI; CO = (A & B) | (A & CI) | (B & CI); end endmodule Slide taken direct from Prof...
Verilog 支持两种赋值 :过程赋值(procedural) 和连续赋值(continuous)。 过程赋值用于过程代码 initial, always, task or function)中给reg 和 integer变量 time\realtimereal赋值, 而连续赋值一般给wire 变量赋值。 Always @(敏感表 敏感表要完整 如果不完整 将会引起仿真和综合结果不一致 always @(d or Clr) if...
Verilog有两种赋值方式:过程赋值(procedural)和连续赋值(continuous).过程复制用于过程代码(initial,always,task,function)中给reg和integer变量,time\realtime\real复制,而连续赋值一般给wire变量赋值. always@(敏感表),敏感表要完整,如果不完整,将会引起仿真和综合结果不一致,如: always@(d or Clr) if(Clr) q =...