12.3 Signal Integrity Issues

Reference Voltage

Most input pins on the processor use a current-mirror sense amp with Vref[SC,Sys] supplied to the negative input to provide a single rail input receiver. The following input pins are exceptions to this rule:

 All other inputs require a stable Vref[SC,Sys] supply for proper operation.

The Vref[SC,Sys] source can be a simple voltage divider; the actual impedance of this source is not critical, since the Vref[SC,Sys] signals are sampled through a low-pass filter on the processor.

Copyright 1995, MIPS Technologies, Inc. -- 29 JAN 96

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