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: XACT FPGA

Product Part: xnfprep

Product Version: 5.2.1

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 associated TS flag attached
  to a net or pin.

This error occurs when user forgets to put a 'TSxx' attribute on the net sourcing 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 tim
espec 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 knows where does the TIM ESPEC starts from.
Xilinx suggests that users go to the new way of writing timespecs TSxx=FROM:xxxx:TO:xxxx=xxNS)




End of Record #1680 - Last Modified: 03/31/97 08:12

For the latest news, design tips, and patch information on the Xilinx design environment, check out the Technical Tips!