FUJITSU MCJ3230AP - Manual (Page 96)

Host Interface
4-24 C156-E205-01EN
When the ODD receives this command, it responds to the command regardless of
the DEV bit value; this means that the drive is unit 0 or 1.
When the ODD is device 0 (master), its response after the command is received
depends on whether device 1 (slave) is connected.
When no device 1 is connected
The ODD sets 01h in the Error register and terminates the command.
When device 1 is connected
The ODD monitors the PDIAG- signal sent from device 1 for six seconds. If
device 1 asserts the PDIAG- signal within this time, the ODD recognizes that the
device 1 self-diagnostic test ends successfully. Otherwise, the ODD recognizes
that the device 1 self-diagnostic test ended abnormally and the ODD makes OR-
operation to its self-diagnostics results of unit 0 (Device 0) with 80h and sets it in
the Error register. If device 1 ends abnormally, the ODD sets the CHECK bit of
the Status register.
When the ODD is device 1
The ODD asserts the PDIAG- signal within five seconds. It sets 01h in the Error
register and ends the command.
Table 4.22 Self-diagnosis detailed code
Detailed code Meaning
01h Normally end
02h-7Fh Hardware error
(For power-on and hardware reset only)
8xh Device 1 ended abnormally. (For device 0 only)