[SI-LIST] : FPGA Partial Plane

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From: Pat Sharkey (psharkey@bvraero.com)
Date: Mon Aug 21 2000 - 06:46:24 PDT


Hello All.

I am new to the SI-list and have an immediate need to solve the following
problem.
The 10-layer board has the following stackup:

        1 - Routing Horizontal
        2 - Ground Plane
        3 - Routing Vertical
        4 - Routing Horizontal
        5 - +5V, +3.3V, +/-10V Power Plane
        6 - Ground Plane
        7 - Vertical Routing
        8 - Horizontal Routing
        9 - Ground Plane
        10 - Vertical Routing

There is a FPGA which also needs +2.5V for its internal core logic. What
layer provides the best location for a partial +2.5V plane (under the FPGA
only)? Does hatching the partial plane (at 45 deg.) have any benefit? The
FPGA uses the +3.3V for its I/O. The +3.3V plane already extends under the
device on the split power plane.

Please advise.

Regards,

Pat Sharkey
BVR Aero Precision Corp.
3360 Publishers Drive
Rockford, IL 61109
PH: 815.874.2471 ext. 101
FX: 815.874.4415

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