6.1 初始事件 在Verilog HDL 中,有一种叫做 initial 的语句,这个语句内的内容会在仿真起始阶段执行一次。Verilog-A 中也有类似的事件控制语句 @(initial_step),这个控制事件中的语句在仿真迭代开始时会执行一次。一般都用它来赋初值或者计算一些变量的初始值。它的用法是: analog begin // 事件控制语句必须放在anal...
提醒是否超出范围 @(initial_step) begin $display ("%M: ") ; if (value>255 || value<...
result= result + i.wavelist_declaration +'\n'returnresultdefget_signal_initial(self): result=''foriinself.signals: result= result + i.signal_initial +'\n'returnresultdefget_count_initial(self): result=''foriinself.signals: result= result + i.count_initial +'\n'returnresultdefget_signa...
// 1 for trigger on rising edge // -1 for falling localparam integer levels = 1<<bits; input in, clk; output [bits-1:0] out; voltage in, clk; voltage [bits-1:0] out; integer result; genvar i; analog begin @(cross(V(clk)-thresh, dir) or initial_step) begin result = levels...
(initial_step)state=1.0; if(analysis(“dc”,“static”))V(CA,CB)<+0.0; @(cross(V(CA)+1.0,-1))state=1.0; @(cross(V(CA)-1.0,+1))state=-1.0; I(CA)<+-(1.71*I(cntrl,R1)*V(VCC,ref)*V(out); V(out)<+transition(state,10n,10n,10n); end endmodule ☛ ☛ ☛ ☛ ...
child my_child; analog begin @(initial_step) $display(“Child_int value : %d”, my_child.child_int); end endmodule This example results in the following error during extraction: Error found by spectre during AHDL compile. ERROR (VACOMP-2162): "$display("Child_int value %s", my_child....
Analog Event Types Description cross(expr,dir) At analog signal crossings above(expr) At signal low-to-high crossing, and when above at DC timer(time,dt) Periodically or at specific times Initial_step At the beginning of simulation final_step At the end of the simulation 2. Cross Event ...
as complex as necessary. Often, initial behavioral models need to carry only the basic properties, such as an operational amplifier might have voltage swings, impedances, and gain. In other cases, there might be a need to model slew rates, ...
(initial_step) begin vos = V(csa_gnd) - Vtp - Vdss ; end ; if (analysis("static")) begin vos = V(csa_gnd) - Vtp - Vdss ; Vin0 = vos ; Vin1 = vos ; V(outp) <+ vos ; end CSA Macromodel (4)else begin Vin0 = vos + 0.9 * laplace_nd(I(inp), {-1 * gm_hi, 0...
analogbegin@(initial_step)beginv_y=0;end v_y=(V(a)>vdd/2 && V(b)>vdd/2)?0:vdd; V(y)<+transition(v_y,tdelay,trise,tfall);end endmodule 带异步置位和清零的D触发器DFF: // VerilogAforveriloga, dff, veriloga `include"constants.vams"`include"disciplines.vams" ...