AR# 2583: PAR 1.4: ERROR: x52ap:111 5200 Design uses to many TBUF's or BUFT's
AR# 2583
PAR 1.4: ERROR: x52ap:111 5200 Design uses to many TBUF's or BUFT's
Description
Keywords: PAR, Error:x52ap, BUFT, TBUF, Longline, Maximum, Three state signals, 5200.
Urgency: Standard
Description: Here is a typical error message:
ERROR:x52ap:111 - This design contains 64 three-state (TBUF) output signals. However, the target device can only accommodate a maximum of 60 three-state signals. Please either reduce the number of three-state signals in your design accordingly, or retarget your design to a larger XC5200 device.
This can be seen when you move a design that used to place and route in XACT, but when moved to M1 issues the error.
This is the result of a software change. In a 5200 CLB there are 4 Logic Cells. Each of these Logic Cells can drive a BUFT which in turn drives a Longline. In Xact the software would allow you to use all 4 of these BUFT's. However, M1 only allows you drive 3 of the 4.
解决方案
If the design uses more than 75% of the BUFT's you will need to modify the design or move to a larger part.
If the design uses less than 75% of the BUFT's the error is the result of user constraining to many BUFT's to a certain row or column. The user will need to adjust his constraints accordingly.