SPI question - IU Transfers Enabled

BANTHER,MICHAEL (HP-UnitedKingdom,ex2) michael.banther at hp.com
Mon Sep 22 06:23:40 PDT 2003


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Sub-clause 10.5.2.3 of SPI-5r05, states:

If the first message received by the SCSI target port during the MESSAGE
OUT phase is not a TARGET RESET message or a PPR message the SCSI target
port shall change to a MESSAGE IN phase and issue a MESSAGE REJECT
message then originate WDTR negotiation (see 4.12.7.5) with the TRANSFER
WIDTH EXPONENT field set to 00h.

If the initiator has been reset or has otherwise forgotten the
negotiated transfer parameters, it makes sense for the target to go into
wide negotiation, but what is the reasoning behind forcing the result of
the negotiation to narrow (Transfer Width Exponent field equal zero)?
By the way, this text exists at least as far back as SPI-3.

Thanks,
Michael Banther
Hewlett-Packard Ltd.
Telephone +44 (117) 312-9503
 

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 Message Sub-clause 10.5.2.3 of SPI-5r05, states:
 If the first message received by the SCSI target port during the MESSAGE OUT phase is not a TARGET RESET message or a PPR message the SCSI target port shall change to a MESSAGE IN phase and issue a MESSAGE REJECT message then originate WDTR negotiation (see 4.12.7.5) with the TRANSFER WIDTH EXPONENT field set to 00h.
 If the initiator has been reset or has otherwise forgotten the negotiated transfer parameters, it makes sense for the target to go into wide negotiation, but what is the reasoning behind forcing the result of the negotiation to narrow (Transfer Width Exponent field equal zero)?  By the way, this text exists at least as far back as SPI-3. Thanks,
 Michael Banther
 Hewlett-Packard Ltd.
 Telephone +44 (117) 312-9503
  


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