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Command Specifications
258 C141-C013
4.4.2 RECEIVE DIAGNOSTIC RESULTS (1C)
Bit
Byte
7 6 5 4 3 2 1 0
0 X'1C'
1 0 0 0 0 0 0 0 0
2 0 0 0 0 0 0 0 0
3 Transfer Byte Length (MSB)
4 Transfer Byte Length (LSB)
5 0 0 0 0 0 0 0 0
This command transfers data (response data) which show the results of executing
the SEND DIAGNOSTIC command from the HDD to the INIT. The format and
content of response data are determined by the parameter list (page code)
specified by the INIT in the SEND DIAGNOSTIC command.
The "Transfer byte length" field in the CDB shows the maximum number of bytes of
response data that can be received by the INIT by this command. The HDD transfers
the number of bytes of data specified by this field or all the bytes of the effective
response data, whichever is smaller in length. Also, when zero is specified in this
field, this command is terminated without anything being transferred.
Exercise caution in the following points when using this command.
1. In order to avoid damage to the results of SEND DIAGNOSTIC
command execution (response data) from a command issued by
another INIT during the interval until this command is issued,
either this command should be executed after the HDD is
reserved.
2. Response data are valid only when "0" is specified in the
"SelfTest (self test)" bit and after a SEND DIAGNOSTIC
command which specifies a specific operation in the parameter
list is executed, with the HDD transferring response data
showing the execution results of the latest SEND
DIAGNOSTIC command. Also, even if this command is
executed, the response data in not cleared, and remains valid
until the next SEND DIAGNOSTIC command is executed.
3. If this command is issued when valid response data do not exist,
the HDD transfers a maximum of 4 bytes of X '00' data to the INIT.
Table 4.56 lists the format of response data transferred to the INIT from the HDD
by this command. The response data are configured from a 4-byte "Page header"
and the "Page parameters" which follow it.