Clause 51: Loopback mode (I/O and serial state)
Resend of earlier posting that may not have gone onto the reflector. It was
that I repost. See below.
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OK one more XSBI memo (for today) ... as stated in the clause, there
is an optional loopback mode. The type of loopback is open to the user
(serial or parallel). I pose the questions of
1) Should we spec the I/O type for the control input
2) State of output serial stream in loopback mode ... brief discussion was
that the serial output should be static (either 1's or 0's)
I would put forth that the input be consistent w/ the LOS and Sync_Err type
and that the serial output should be a logic "0" (no light on PMD).