AR# 8822: 2.1i XC9500 Family Tsim - Addition of TPTA2 timing value
2.1i XC9500 Family Tsim - Addition of TPTA2 timing value
Keywords: cascade, tpta
General Description: Product term cascading will generate a delay. Previously, this delay was a single value. The worst case delay is cascading a product term from Macrocell 1 to Macrocell 18 (or vice versa). Product term cascades for adjacent macrocells are much faster. Obviously this worst case delay can only happen once (per function block) thus timing reported for multiple cascades seem much worse than they should be.
The end-around product term cascade delay will remain Tpta. The addition of Tpta2 will be the worst case delay for cascades within the function block.