Answers Database

Cadence Concept XC4000E: ofdtxi flip-flop powers-up reset instead of setin Hardware.


Record #2078

Product Family:  Software

Product Line:  Cadence

Problem Title:
Cadence Concept XC4000E: ofdtxi flip-flop powers-up reset instead of
setin Hardware.



Problem Description:
Ketwords: ofdtxi, flip flop, reset, xc4000e, cadence, concept

Urgency: Standard

General Description:

When the OFDTXI IOB flip-flop component is used in a design, the
flip-flop should initialize to a logic '1' high at power-up, but
it instead initializes to a logic '0' low.


Solution 1:

The initialization logic value for flip-flops are set by the
INIT attribute.  All library component flip-flops that are to
initialize to a logic '1' should have the attribute INIT=S
already on them.  The Xilinx library component OFDTXI for the
Cadence Concept interface is missing this attribute.

This attribute can be added manually by the user.  Click on
the "Attribute" button, then click on the OFDTXI symbol.
An attribute window pops up.

Click on "Add" to add a new property.  In the NAME field,
enter "INIT", and in the VALUE field, enter the letter, "S".
Click on "Done" to accept.



End of Record #2078