Answers Database

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


Record #2019

Product Family:  Documentation

Product Line:  Other

Problem Title:
XNF Specification: What is difference between T and B direction in an
EXT record?



Problem Description:
Keywords: pin direction bidirectional tristate three-state xnf
specification

Urgency:  standard


General Description:

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



Solution 1:

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





End of Record #2019