RE: Conventional PCI mechanical specification

[Richard Walter <rwalter@brocade.com>]

Bruce,

My reading of figure 5-2 in PCI 2.2 (page 155) is that the maximum height of
an adapter card is 106.807mm from the bottom of the gold fingers to the top
of the board.  Ie: A PCI card blank would fit snugly in a box which is
106.807mm tall.

Note: This dimension can be checked by noting that the left side of the
drawing shows 106.68mm for total height.  And, by calculating: Bottom of
gold finger to datum B (12.07) + datum B to top hole (89.53) + half of keep
out area around top hole (10.16 / 2) = 12.07 + 89.53 + 5.08 = 106.68.
Applying the +/- 0.127mm tolerance gives a max of 106.807, as you say.

(Yes, I know that assuming that the hole is right in the middle of the
keepout is not good for design work, but it's pretty good for a quick
check.)

-Richard Walter
Senior Hardware Engineer
Brocade Communications Systems
rwalter@brocade.com
Note: I speak for myself, not for Brocade Communications.


-----Original Message-----
From: Bruce Newton [mailto:bnewton@mecc.com.au]
Sent: Thursday, May 30, 2002 8:25 PM
To: pci-sig@znyx.com
Subject: Conventional PCI mechanical specification


I have a problem where I have two vendors claiming their product is to the
PCI specification, and I would like to know what the specification actually
is regarding this particular point.

The issue is with the PCI card height. The card is a conventional PCI card,
and the specification states (I believe) that the maximum height of the
adapter card should be no more than 106.807mm. Is this maximum height
measured from the bottom of the edge connector to the top of the card, ie
the PCB's maximum height. Or is it measured from the top of the edge
connector to the top of the card, ie the height of the card above the socket
when it is inserted in a computer.

Any response regarding this would be appreciated.

Regards,
Bruce