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AR# 362

What is the fastest pin to pin delay?

Description

What is the shortest pin-to-pin path through an XC7300 device, and
how can this delay be achieved?

解决方案

The fastest asynchronous path through an XC7300 device is tPDFO. This is
the parameter being referenced when an XC7300 speed grade is specified.

tPDFO is the path from a fast input pin through one level of Fast Function Block
logic to an output pin.

This path can be specified by flagging inputs as fast inputs (using the (FI) or
.FI syntax in PLUSASM designs, or the F net attribute in schematic designs).
The associated output pin should be assigned to a Fast Function Block if necessary,
and cannot use more than 4 product terms when implemented as an active
low equation.
AR# 362
创建日期 09/20/1995
Last Updated 01/15/2003
状态 Archive
Type 综合文章