"S/R recovery before clock" (tRAI) for Coolrunner II

[forsa]

I am reading the Timing Model in DS090 for Coolrunner II, but I can't find the "Register asynchronous S/R recovery before clock" (tRAI)  

Is it not applicable anymore?  

[forsa]

The reason I am asking is that I'm porting code from a XC9500 to a Coolrunner 2 (XC2C128-7)

The design includes a VME bus slave, where the interface is designed asynchronously. The data strobe input is fed to the S/R pin of a FF, while a delayed version of this strobe signal is fed to the clock input of the same FF. 

The Clk input needs to be sufficiently delayed so that the FF has time to recover after the reset (the clock edge cannot occur instantly after releasing the reset due to tRAI). 

The reset recovery time (tRAI) is 10 ns for the XC95144XL-10 

http://www.xilinx.com/support/documentation/data_sheets/ds056.pdf

but I can't find the tRAI for my XC2C128 here:

http://www.xilinx.com/support/documentation/data_sheets/ds093.pdf

Why? Am I missing fundamental changes to the architecture?

Best Regards, 

Steffen Forså

[forsa · Accepted solution]

Solved. This is the answer from helpdesk:

We dont have a Trai value for the Coolrunner-II. But the "safe to use" value for Trai would be to copy the Taprpw for the density/speed grade.