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AR# 2019

XNF Specification - What is difference between T and B direction in an EXT record?

Description

Keywords: pin direction, bidirectional, tristate, 3-state, XNF
specification

Urgency: Standard


General Description:
What is difference between T and B direction in an EXT record?

Solution

If you are looking at the output of XNFPREP (which actually
traces the paths to the I/O for you and makes any needed
corrections to pin directions), the pin directions in the .XTF
can be interpreted as follows:

EXT, T ==> tristatable output, no input path

EXT, B ==> tristatable bidirectional output (pin does have an
input path


AR# 2019
Date Created 08/31/2007
Last Updated 02/08/2001
Status Archive
Type ??????