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Simulators >> AMS Simulators >> How to define digital high level to a specific val
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Message started by bernd on Feb 3^rd, 2006, 8:13am

Title: How to define digital high level to a specific val
Post by bernd on Feb 3^rd, 2006, 8:13am

In a Cadence DFII analog environmet mixed-signal simulation
no matter if it is AMS or SpectreVerilog,
the high level of the digital signal is always 5V,
if it is displayed in the same waveform window as the analog signal.
This happens in AWD as well as in WaveScan.
In WaveScan there is an additional option d2aDialog which could create
a derivate waveform from the digital one and put it on the right level.

Question, does anybody know how to initialy define the digital
high level equal to the supply voltage?

Thanks Bernd

PS: This is not an issue of interface elements or connect rules.

Title: Re: How to define digital high level to a specific
Post by Andrew Beckett on Feb 5^th, 2006, 8:43am

For AWD there's a private function:

awviSetLogicLevels(1.0 4.0)

which sets the low and high voltage levels - but it's private. However, since AWD is going away in IC610, I don't see much danger in using it...

For wavescan there's cdsenv settings:

Code:

wavescan.trace dToAHiVoltage string "5.0"
wavescan.trace dToALoVoltage string "0.0"
wavescan.trace dToAXVoltage string "(vhi + vlo)/2"
wavescan.trace dToAUnit string "V"

I've not tried the wavescan settings, but I think these should do what you want.

Regards,

Andrew.

Title: Re: How to define digital high level to a specific
Post by bernd on Feb 6^th, 2006, 1:12am

Thanks Andrew that's exactly what I was looking for.
I've overlooked the entries in .../dfII/etc/tools/wavescan/.cdsenv

Bernd