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analog语句内部 @(...
parameter real center_freq=40M; parameter real vco_gain=40M; parameter real step_period=32;//3...
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...
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....
(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 ☛ ☛ ☛ ☛ ...
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 ...
(initial_steporinitial_step("dc"))begin c1=iin_max/(slew_rate); gm_nom=2*`PI*freq_unitygain*c1; r1=gain/gm_nom; vmax_in=iin_max/gm_nom; end vin_val=V(vin_p,vin_n)+vin_offset; // //Inputstage. // I(vin_p,vin_n)<+(V(vin_p,vin_n)+vin_offset)/rin; I(vref,vin_...
(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" ...