Answers Database

XNFPREP 5.2.1: Error 7859:'C2P' type TS attribute 'TSxx' need an associated TS flag attached to a net or pin.


Record #1680

Product Family:  Software

Product Line:  FPGA Core

Problem Title:
XNFPREP 5.2.1: Error 7859:'C2P' type TS attribute 'TSxx' need an
associated TS flag attached to a net or pin.



Problem Description:
Keyword: xact-performance, timespec

Urgency: standard

General Description:

XNFPREP 5.2 or 5.2.1: Error 7859:'C2P' type TS attribute 'TSxx' needs an associa
ted TS flag attached to a net or pin.

This error occurs when user forgets to put a 'TSxx' attribute on the net sourcin
g the FFS at D input or Clock input.


Solution 1:

Say you have the following:


	  _______			 _____
  DIN	 |	 |	       |\  OUT	/     |
---------|D	Q|-------------| >------  PAD |
	 |  FFS  |	       |/	\_____|
 CLOCK	 |	 |
---------|C______|
The user needs to put a flag on the net which is sourcing the FFS, and the flag
has to match the timespec label.  For example, if user has a timespec
.
.
.
TS21=C2P:100:OUT
.	     ^^^--It has to be the net sourcing the PAD.

The user has to put 'TS21' as an attribute on DIN or CLOCK net, so the tool know
s where does the TIMESPEC starts from.
Xilinx suggests that users go to the new way of writing timespecs TSxx=FROM:xxxx
:TO:xxxx=xxNS)



End of Record #1680