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AR# 2244

NGD2EDIF M1.3: WARNING:basnu - This design contains the undriven net "<net name>"

説明

Keywords: NGD2EDIF, GSR, GTS, GLOBALSETRESET, GLOBALTHREESTATE,
undriven

Urgency: Hot

General Description:

NGD2EDIF may report the following warning:

WARNING:basnu - NOTE: This design contains the undriven net "GSR" which you must drive during simulation to get valid results.

This warning may apply to any of the following signal names:

GSR
GTS
GLOBALSETRESET (Mentor Graphics)
GLOBALTHREESTATE (Mentor Graphics)

ソリューション

Even though you may not be using the global set/reset or global
three-state signal in your implemented design, these signals still
exist in the timing simulation model that NGD2EDIF writes. To
initialize simulation correctly, these nets should be driven at the
start of simulation as follows:

GSR/GLOBALSETRESET: Asynchronous set/reset of all flip-flops
Logic 1 at time 0
Logic 0 after time Tmrw*

GTS/GLOBALTHREESTATE: Three-state control of all user outputs
Logic 0 at time 0

*Tmrw: Minimum master-reset pulse width as given in the Programmable
Logic Data Book under CLB Siwtching Characteristic Guidelines.
AR# 2244
作成日 08/31/2007
最終更新日 04/05/2000
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