Inconsistency between MMC-4, MMC-5, and MMC-6 on READ (12) opcode

Ralph Weber Ralph.Weber at wdc.com
Tue Mar 4 10:50:46 PST 2014


Formatted message: <a href="http://www.t10.org/cgi-bin/ac.pl?t=r&f=r1403043_f.htm">HTML-formatted message</a>

Depending on where one looks, MMC-6 r02g associates READ (12) with three
different op codes.
  *   28h once
  *   A8h ~7 times
  *   AAh ~ twice
There is also at least one Aah as the WRITE (12) op code.
Pity the poor soul sent to drain this swamp.
All the best,
.Ralph
________________________________
From: owner-t10 at t10.org [owner-t10 at t10.org] on behalf of John Lohmeyer
[lohmeyer at t10.org]
Sent: Tuesday, March 04, 2014 11:22 AM
To: T10 Reflector
Subject: Re: Inconsistency between MMC-4, MMC-5, and MMC-6 on READ (12)
opcode
Sorry everyone. I accidentally reversed the opcode values in my first posting
|from what Z JAN said. The exact words in the email to me were:
In [ mmc6r02g.pdf 6.15 ] and [ mmc5r04.pdf 6.16 ], the OperationCode of
READ(12) command had error value of 28h, but it should be A8h.
The value in mmc4r05a.pdf is right.
For reference:
The final working draft of MMC-4:
  http://www.t10.org/cgi-bin/ac.pl?t=f&f=mmc4r05a.pdf
PDF Page 334, Table 335 - READ (12) CDB has operation code (A8h)
The final working draft of MMC-5:
  http://www.t10.org/cgi-bin/ac.pl?t=f&f=mmc5r04.pdf
PDF Page 428, Table 347 - READ (12) CDB has operation code (28h)
The final working draft of MMC-6:
  http://www.t10.org/cgi-bin/ac.pl?t=f&f=mmc6r02g.pdf
PDF Page 400, Table 336 - READ (12) CDB has operation code (28h)
I think that Z JAN is correct and both MMC-5 and MMC-6 are in error.
By the way, only T10 members will be able to access the above links to the
final working drafts of the MMC standards.
John
--
John Lohmeyer		       Email: lohmeyer at t10.org
LSI Corp.		       Voice: +1-719-533-7560
4420 ArrowsWest Dr.		Cell: +1-719-338-1642
Colo Spgs, CO 80907



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