[evla-sw-discuss] MIB board

[B Carlson]

Based on Jim Jackson's recent email concerning MIB interference, it
seems clear to me that the antenna and correlator MIBs will probably
have to be different.  The only outside chance for the CompuLab 586
core, is to somehow build a shielded box for it and run it at the lowest
clock speed of 66 MHz.  This could perhaps be done by building a small
custom carrier card for it that plugs into a main electronics
board--this carrier card could contain an FPGA for address decoding to
provide only the select lines and SPI bus needed (the 586 core does have
SPI).  Programmable slew-rate control of the FPGA outputs could help to
alleviate EMI problems.   This hybrid-like approach might be attractive
in that we retain control of the main electronics board interface
because of the carrier, have perhaps better control of EMI because of
the shielded box and FPGA slew-rate control (and the ability to filter
lines if we want), and are able to take advantage of h/w and s/w that is
cheap and has already been engineered for us.

Just some thoughts,
Brent.

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