Answers Database

PPR 5.1: Use of 5.0 guide file with XBLOX counters causes ERROR 9081


Record #524

Problem Title:
PPR 5.1: Use of 5.0 guide file with XBLOX counters causes ERROR 9081


Problem Description:



Solution 1:




PROGRAM: PPR

VERSION: 5.1		

PLATFORM(s):  All

SHORT DESCRIPTION: 	

Guide files created with XACT 5.0 that contain XBLOX counters may not work in 5.
1.

ERROR MESSAGE:		

*** PPR: ERROR 9081:
 The following RLOC set(s) could not be placed on the device.

LONG DESCRIPTION: 	

PROBLEM:

A design that used to work in XACT 5.0 is run through XACT 5.1, and error 9081 i
s
produced from PPR. The design contains XBLOX counters.


CAUSE:

In XACT 5.0, XBLOX would create RLOC counters for widths of 13 bits or more. In
XACT
5.1, XBLOX does this for counters 6 bits and wider. If your 5.0 guide file has X
BLOX
counters of 6 - 12 bits, XBLOX 5.1 will create RLOC counters and thus there will
 be
a significant different between the guide information and the netlist received b
y PPR
from XBLOX. The guide file has ripple counters (no RLOC's) and the new <design>.
xtf
has RLOC counters. PPR, unable to resolve the discrepancy, fails.


SOLUTION: 	

Set the attribute USE_RLOC=FALSE for each counter that is affected by this chang
e (this
will cause them to be implemented as they were in 5.0, as ripple counters), or
create a new guide file using the 5.1 tools.








End of Record #524