User`s guide

6 Mixed Analo

/Di

ital Simulation

Settin

the Default A/D Interface

For mixed-signal simulation, you can select the AtoD and DtoA

interface level circuit-wide and on individual device instances.

• To select the default interface level circuit-wide, select one

of the four Default A/D interfaces in the Digital Setup

dialog. Part instances whose IO_LEVEL attribute is set to 0

will use this value.

• You can override the circuit-wide default on an individual

part by specifying an IO_LEVEL attribute from 1 to 4,

where:

For example, the simulator can be informed to use the level 2

interface subcircuits for a 7400 instance by setting its

IO_LEVEL attribute to 2. All other part instances continue to

use the circuit-wide setting. By default, IO_LEVEL is set to 0,

thus instructing the simulator to use the circuit-wide level

defined in the Digital Setup dialog box.

1: AtoD1 and DtoA1 (default)

2: AtoD2 and DtoA2

3: AtoD3 and DtoA3

4: AtoD4 and DtoA4