Product Documentation
Spectre AMS Designer and Xcelium Simulator Mixed-Signal User Guide
Product Version 22.09, September 2022

UCM Compatibility with Legacy Connect Rules

The following table shows the  parameterized feature compatibility of UCM with the legacy connect rules CR_full_fast, CR_full and CR_basic:

IE Card Parameter

Default Value Compatibility

Functionality

Current CR_full

accuracy=conservative

Current CR_full_fast

accuracy=moderate

Current CR_basic

accuracy=liberal

tr

200p

200p

200p

200p

200p

200p

Rise/full time of transition between vhi and vlo

ignore_xz

0

0

0

0

1, fixed

1

Ignores X in L-to-E conversion

vx

(vhi+vlo)/2

(vhi+vlo)/2

vlo

vlo

IGNORED

vlo

The voltage of X in L-to-E conversion

vz

(vhi+vlo)/2

(vhi+vlo)/2

vlo

vlo

IGNORED

vlo

The voltage of Z in L-to-E conversion

vtol

vsup/30

vsup/30

vsup/12

vsup/12

vsup/6

vsup/12

Signal cross-tolerance in E-to-L conversion

rx

(rlo+rhi)/10

(rlo+rhi)/10

rout

rout

IGNORED

rout

Resistance of X in L-to-E conversion

analog_load

1

1

0

0

0, fixed

0

Feedback analog loading effect to the digital receiver in L-to-E

nox

0

0

0

0

1, fixed

1

Does not produce X in E-to-L conversion

ramp_type

1

1

0

0

0, fixed

0

Signal rise/fall transition ramp type in the electrical contribution of L-to-E

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