Error in training sequence in SPI-4 rev 0

gop at us.ibm.com gop at us.ibm.com
Tue Jun 6 10:58:57 PDT 2000


* From the T10 Reflector (t10 at t10.org), posted by:
* gop at us.ibm.com
*
There is an error in section in section 10.8.4.2 of the SPI-4 spec, where
the training sequence is defined. This has to do with when section A begins
relative to the SEL signal. I believe the word (strikethrough: negating) (2
places) in the excerpts below should be asserting  .  This will be
corrected in rev 1.

    10.8.4.2.2 DT DATA IN phase training pattern
    The target shall indicate a training pattern is going to occur on a DT
    DATA IN phase by:
    1) negating the SEL signal a minimum of two system deskew delays before
    changing the MSG, C/D,
    and I/O signals, and
    2) asserting the SEL signal a minimum of two system deskew delays after
    asserting the MSG and I/O
    signals and negating the C/D.
    The target shall begin the A section of the training pattern no sooner
    than two system deskew delays after
    (strikethrough: negating) asserting the SEL signal. The target shall
    transmit the following training pattern:

    Start of A section;
    1) disable precompensation;
    2) simultaneously assert REQ, P1, and DB(15-0,P_CRCA) signals;
    3) wait 32 transfer periods (e.g., 200 ns at fast-160);
    4) simultaneously negate REQ, P1, and DB(15-0,P_CRCA) signals;
    5) wait 32 transfer periods;
    6) set precompensation to negotiated state;
    7) negate SEL signal;
     ...

    10.8.4.2.3 DT DATA OUT phase training pattern
    The target shall request a training pattern on a DT DATA OUT phase by:
    1) negating the SEL signal a minimum of two system deskew delays before
     changing the MSG, C/D,
    and I/O signals, and
    2) asserting the SEL signal a minimum of two system deskew delays after
     asserting the MSG signal
    and negating the C/D and I/O signals.
    The target shall begin the training pattern no sooner than two system
    deskew delays after (strikethrough: negating) asserting the
    SEL signal. The target shall transmit the following training pattern:
    1) disable precompensation;
    2) assert REQ and P_CRCA signals;
    3) wait 32 transfer periods (e.g., 200 ns at fast-160);
    4) negate REQ and P_CRCA signals;
    5) wait 32 transfer periods (e.g., 200 ns at fast-160);
    6) set precompensation to negotiated state;
    7) negate SEL signal;
     ...



    Bye for now,
    George Penokie

    Dept Z9V  114-2 N212
    E-Mail:    gop at us.ibm.com
    Internal:  553-5208
    External: 507-253-5208   FAX: 507-253-2880


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