Answers Database

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


Record #1787

Product Family:  Hardware

Product Line:  4000

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



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


Solution 1:

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



End of Record #1787