RE: Generation of RST# at System Power Down

["Joseph Brcich" <jbrcich@juniper.net>]

We used a LTC1536 on our system board. It monitors the supplies and
generates RST.

Regards
Joe

-----Original Message-----
From: Douglas J. Clark [mailto:douglas.j.clark@jpl.nasa.gov]
Sent: Thursday, November 14, 2002 9:12 AM
To: pci-sig@znyx.com
Subject: Generation of RST# at System Power Down


Hi-

I'd like to know the typical methods for generation of the PCI signal
RST#, 
especially at the time a system is powered down. Section 4.3.2 of the
PCI 
Rev. 2.2 spec says that RST# must go active within 500 ns of the power
rail 
going out of specification. Is monitoring of the power rail and the 
generation of the RST# signal typically performed by the power supply,
or 
by components on the motherboard? Is it done differently for CompactPCI?

Do typical desktop PCs really meet the 500 ns requirement? Can PCI
output 
buffers be damaged if RST# takes longer to become active at power-down?

Thanks!

-Doug Clark