Answers Database
SYNPLIFY: "tristate driver NoName on net NoName has its enable tied to GND"
Record #510
Product Family: Software
Product Line: Synplicity
Product Part: Synplify
Product Version: 5.0
Problem Title:
SYNPLIFY: "tristate driver NoName on net NoName has its enable tied to GND"
Problem Description:
Urgency: Standard
General Description: For an output signal listed in the port list that is
not being driven, Synplify will issue this warning:
@W: *Output test has undriven bits
But also, Syplify will issue this set of obscure warnings:
@W: tristate driver NoName.3 on net
NoName.3 has its enable tied to GND
@W: tristate driver NoName.2 on net
NoName.2 has its enable tied to GND
@W: tristate driver NoName.1 on net
NoName.1 has its enable tied to GND
@W: tristate driver NoName on net No
Name has its enable tied to GND
Solution 1:
Synplify will synthesize an OBUFT with its input driven
by GND and the T pin driven by VCC for a driverless output
signal that is listed as a port in the top level module.
End of Record #510 - Last Modified: 03/08/99 16:52 |
