17-May-1996

To: John Anderson

From: Michael S. Matulik

Subject: D0 request for modifications to VRB/FIB Custom J3 Backplane

Good morning John. I would like to forward this request to you on behalf of

my colleagues at the D0 experiment. We have examined the latest VRB/FIB Custom

J3 Backplane specification (located through the ESE home page on the web, dated

April 23, 1996) and found that we can also use the backplane in our prototype

evaluation/test beam applications with certain caveats.

* For use with an existing VME readout module, which is not slated to be

replaced in the upgrade, the connector located in the slot 4 position must

be compatible with a standard DIN 41612 (96 position) socket.

* We would like to have three, low-speed, TTL level traces routed from the

connector located in slot 4 to the connector in slot 15 (driver module).

We have no requirements or preferences for the pin assignment in the slot 15

connector. The required pin assignment for the pin assignment in the slot 4

connector are as follows:

"SLAVE_READY" J3 Slot 4 Pin C08

"RESERVEDA" J3 Slot 4 Pin C09

"FINISHED" J3 Slot 4 Pin C10

To maintain the electrical performance of the back plane for those users

which may elect to shear the structure between slots 8 and 9, one should avoid

routing copper planes or traces below these three traces in the area to be

sheared.

* We would like to verify that, at a minimum, the pins designated "USER I/O"

for the connector located in slot 15 (driver module) extend through the

backplane long enough to allow for the connection of a transition module in this

slot. The case where all pins (with the exception of the +3.3V and GROUND pins

specified to be short) are long is acceptable.

If there are any questions or things that I can clarify, please don't hesitate to

contact me at extension 4091, or at MATULIK@FNAL.GOV.

Mike

cc. M. Baert B. Haynes

E. Barsotti K. Woodbury

M Johnson

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