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AR# 31167

10.1 ISim - Simulation fails to launch if design instantiates MOS switches (pmos, nmos, etc.)


When I run behavioral simulation with ISim, the compiler exits abruptly if I have an array instantiation of MOS switches (pmos, nmos, rpmos, rnmos).

Why does this occur?


Array instantiation of MOS switches is not yet supported by ISim.

For example :

reg [2:0] dq;
nmos pull_dq [2:0] (dq, data, control);

The above instantiation will cause ISim compiler to exit.

To work around this problem, unroll the instantiation as shown below:

generate for(genvar g = 0; g <= 2; g = g+1)
nmos pull_dq (dq[g], data, control))

This issue is fixed in 10.1 Service Pack 3.

NOTE: Range instantiation of any other gate or switch is supported.
AR# 31167
Date 12/15/2012
Status Active
Type General Article
  • ISE - 10.1