AR# 510: SYNPLIFY: "tristate driver NoName on net NoName has its enable tied to GND"
AR# 510
SYNPLIFY: "tristate driver NoName on net NoName has its enable tied to GND"
Description
Keywords: Synplify, Verilog
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
解决方案
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.