A verilogA code to measure frequency (copied from designers-guide)

However, i got many warnings and errors.
Is it because it is a verilogAMS rather than verilogaA?
I am using Cadence 5141 mmsim61



1) like the `timescale 1ns / 1ps ->

Warning from spectre during SpectreHDL compile.
   "xxxx/freq_meas/veriloga/veriloga.va", line 6:
       Warning: `timescale directive is found in the module, if without a
       `default_transition directive or local setting of transitions in either
       transition filters or Z-transforms. In Verilog-A this results in the
       `timescale setting the transistion time which is not supported by the
       Verilog-AMS LRM.  Please use `default_transition instead to set default
       transition time for transition filters or zi_* filters.

Sound like I could I use this command.

2)
Line14 "initial begin<<--?" syntax error

Code:

[color=#0000ff]`timescale 1ns / 1ps[/color]

module freq_meas (clk);
    input clk;
    real last_time, current_time, freq;

[color=#0000ff]    initial begin[/color]
	last_time = 0.0;
	freq = 0.0;
    end
    always @(posedge clk) begin
	current_time = $realtime;
	if (last_time > 0.0)
	    freq = 1.0e9 / (current_time - last_time);
	last_time = current_time;
    end
endmodule
 

Quote:


Seems like you incorrectly included it in the netlist, so that Spectre thinks it is SpectreHDL, not Verilog-A nor Verilog-AMS.