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6.20.6
DIAGNOSTIC 65 -- SET READ ERROR HANDLING OPTIONS
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The selected drive is set in the special error recovery mode
established by the contents of byte 05.
The error handling mode
is set to the default value by a hard SCSI reset condition, a
power on reset,
and by a SEND DIAGNOSTIC command specifying the
default error handling value.
Byte
o
1
2
3
4
5
Contents
The Error Handling options are specified below:
00 H
Default value.
A correctable error will be corrected and all data transfer
will be completed.
No check status will be presented.
If
the error is not correctable, the controller will transfer
the uncorrected data
and post an error code of
ll~
with the
address valid bit set.
The address will be the loglcal block
address of the bad block.
If an ECC error occurs on the first read of a data field, the
data transfer operation will be halted after transfer of the
bad data block.
A check condition will be presented.
The
error code will be 18 with the address valid bit set.
The
failing block address will be in the logical block address
field of the sense information.
A correctable error will be corrected and the corrected data
transferred.
The operation will then stop and present check
status and an error code of 18 H as described in option 01. An
uncorrectable error will be handled as in option 00.
6.20.7
DIAGNOSTIC 66 -- INITIATE TRACE
A high-level state trace facility is provided in the ACB-5500.
The purpose is to provide the user with a tool to analyze complex
multi-host SCSI interactions.
500504-00
6-47
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