Rocket IO Deserializer

[Lee]

Hello,

Someone has pointed out to me that the implementation in
the Virtex2PRO will only go through the alignment once, i.e.
ignoring any subsequent ALIGN characters in the data stream.

The spec is a little ambiguous and I am unsure if this does actually
happen.
Quote:
"if a comma is detected and the data is aligned, no further
alteration takes place"
which sounds like what i was told, but it then goes on to say:

"The transceiver continuously monitors the data for the presence
of the 10-bit chars. Upon each occurrence of the 10-bit char, the data is
checked for
word alignment"

Does anyone have any practical experience of the alignment (comma detection
enabled)? If so once the data is aligned are all subsequent align chars
in the stream ignored? or does the det/Align re-align the data every time?


Lee

--

 

[ka]

On Tue, 17 Aug 2004 18:38:37 +0100, Lee <no.way@spam.com> wrote:

Hello,

Someone has pointed out to me that the implementation in
the Virtex2PRO will only go through the alignment once, i.e.
ignoring any subsequent ALIGN characters in the data stream.

The spec is a little ambiguous and I am unsure if this does actually
happen.
Quote:
"if a comma is detected and the data is aligned, no further
alteration takes place"
which sounds like what i was told, but it then goes on to say:

"The transceiver continuously monitors the data for the presence
of the 10-bit chars. Upon each occurrence of the 10-bit char, the data is
checked for
word alignment"

Does anyone have any practical experience of the alignment (comma detection
enabled)? If so once the data is aligned are all subsequent align chars
in the stream ignored? or does the det/Align re-align the data every time?


Lee

in any communication system bit errors are always a certainty albeit
with very low probability. the receiver should check the data it sees
constantly and try to do bit lock and symbol lock when there are too
many errors which are detected by align symbols not aligning properly
or too many decode errors etc.