[mod.vlsi] SPICE problem inquiry

jgouge@MITRE-GATEWAY.ARPA (Jim Gouge) (01/03/86)

Can anyone help me with a SPICE problem?

I am attempting to make SPICE runs with no options set
and the following timing-related command lines:

	vphi1 7 0 pulse(0v 5v 5ns 5ns 5ns 35ns 100ns)
	vphi2 4 0 pulse(0v 5v 55ns 5ns 5ns 35ns 100ns)
	.trans 5ns 600ns

A typical error message I get is:

	*ERROR*:  INTERNAL TIMESTEP TOO SMALL IN TRANSIENT ANALYSIS

	          TIME = 1.05560d-07; DELTA = 4.76837d-18; NUMNIT = 1098

As indicated by the TIME parameter, this is after (in this case) 105ns 
of successful operation.  Runs have been made at levels 1, 2, and 3 
with the same sort results.

Any suggestions?