// Inter-assignment delay: Wait for #5 time units // and then assign a and c to 1. Note that 'a' and 'c' // gets updated at the end of current timestep #5 a <= 1; c <= 1; // Intra-assignment delay: First execute the statement // then wait for 5 time units and then ...
so value of z='bz001z assign z[3:1] = {x,y}; // Case #3; The same statement is used but now 4-bits of z is driven with a constant // value of 1. Now z = 'b1001z beacuse only bit0 remains undriven assign z[3:1] = {x,y}; assign z[4] = 0; // Case #4; Assu...
我们只能在initial以及always块内对reg类型变量进行赋值。 隐性连续赋值 当使用assign给wire类型的网络赋值时,称为显示连续赋值,如果在定义的时候就对其连续赋值,称为隐形连续赋值。 wire [1:0] a; assign a = x & y; // Explicit assignment wire [1:0] a = x & y; // Implicit assignment 1. 2. 3...
Notice how I’ve carefully chosen not to consume any time within this always block, yet I’ve still managed to create something that will capture the passage of time. In this case, I’ve used the Verilog<=together with a delay statement to schedule the transition ofreadyfrom zero back to...
25 Error: VHDL error at shift_reg.vhd(24): can't synthesize logic for statement with conditions that test for the edges of multiple clocks ---同一进程中含有两个或多个if(edge)条件,(一个进程中之能有一个时钟沿) 26 Error: Can't resolve multiple constant drivers for net "datain_reg[22]...
Non-blocking procedural assignment.//Expression is evaluated when the statement is encountered, and assignment is postponed until the//end of the simulation time-step. In a begin-end sequential statement group, execution of the next//statement is not blocked; and will be evaluated before the assi...
module time_delay_module(input ai, bi,output so_lose, so_get, so_normal);assign #20 so_lose = ai & bi ;assign #5 so_get = ai & bi ;assign so_normal = ai & bi ;endmodule testbench 参考如下: `timescale 1ns/1nsmodule test ;reg ai, bi ;wire so_lose, so_get, so_normal ...
Nonblocking assign updates event queue中LHS expression是随机的。 The nonblocking assign updates event queue is where updates to the LHS expression of nonblocking assignments are scheduled. The RHS expression is evaluated in random order at the beginning of a simulation time step along with the other...
//Examples:initialbegina=1;// Assign a value to reg a at time 0#1;// Wait 1 time unitb=a;// Assign the value of reg a to reg bendalways@(aorb)// Any time a or b CHANGE, run the processbeginif(a)c=b;elsed=~b;end// Done with this block, now return to the top (i....
Delay values are useful for specifying delays for gates and are used to model timing behavior in real hardware because the value dictates when the net should be assigned with the evaluated value. Rules There are some rules that need to be followed when using anassignstatement: ...