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C141-E090-01EN5 - 38
Regarding software reset, the mode set prior to software reset is retained after software reset.
The parameters for the multiple commands which are posted to the host system when the
IDENTIFY DEVICE command is issued are listed below. See Subsection 5.3.2 for the
IDENTIFY DEVICE command.
Word 47 = 8010:
Word 59 = 0000:
= 01xx:
Maximum number of sectors that can be transferred per interrupt by the
READ MULTIPLE and WRITE MULTIPLE commands are 16 (fixed).
The READ MULTIPLE and WRITE MULTIPLE commands are
disabled.
The READ MULTIPLE and WRITE MULTIPLE commands are
enabled. "xx" indicates the current setting for number of sectors that can
be transferred per interrupt by the READ MULTIPLE and WRITE
MULTIPLE commands.
e.g. 0110 = Block count of 16 has been set by the SET MULTIPLE
MODE command.
(16) EXECUTE DEVICE DIAGNOSTIC (X'90')
This command performs an internal diagnostic test (self-diagnosis) of the device. This
command usually sets the DRV bit of the Drive/Head register is to 0 (however, the DV bit is
not checked). If two devices are present, both devices execute self-diagnosis.
If device 1 is present:
• Both devices shall execute self-diagnosis.
• The device 0 waits for up to 5 seconds until device 1 asserts the PDIAG- signal.
• If the device 1 does not assert the PDIAG- signal but indicates an error, the device 0 shall
append X‘80’ to its own diagnostic status.
• The device 0 clears the BSY bit of the Status register and generates an interrupt. (The
device 1 does not generate an interrupt.)
• A diagnostic status of the device 0 is read by the host system. When a diagnostic failure
of the device 1 is detected, the host system can read a status of the device 1 by setting the
DV bit (selecting the device 1).
When device 1 is not present:
• The device 0 posts only the results of its own self-diagnosis.
• The device 0 clears the BSY bit of the Status register, and generates an interrupt.
Table 5.7 lists the diagnostic code written in the Error register which is 8-bit code.
If the device 1 fails the self-diagnosis, the device 0 "ORs" X‘80’ with its own status and sets
that code to the Error register.