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AR# 1787

4000EX/XL: Can I use both the Output FF (OFD) and the Output MUX (OMUX2) of an IOB at the same time?

Description

The 2:1 ouput MUX and the output FF of the 4000EX IOB can not
be used at the same time.

解决方案

The output flop and the output mux at the same time. One or
the other drives out the pad.

When the output flop is being used(OFD) :

IOB.OK is routed to the clock input
IOB.O is routed to the data input
IOB.CE is routed to the CE input

When the output mux is being used(OMUX2) :

IOB.OK is routed to the mux select
IOB.O is routed to D1
IOB.CE is routed to D2
AR# 1787
创建日期 01/27/1997
Last Updated 03/03/2004
状态 Archive
Type 综合文章