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C141-E090-01EN 5 - 9
[Diagnostic code]
X'01': No Error Detected.
X'02': HDC Register Compare Error
X'03': Data Buffer Compare Error.
X'05': ROM Sum Check Error.
X'80': Device 1 (slave device) Failed.
Error register of the master device is valid under two devices (master and slave)
configuration. If the slave device fails, the master device posts X’80’ OR (the
diagnostic code) with its own status (X'01' to X'05').
However, when the host system selects the slave device, the diagnostic code of the
slave device is posted.
(3) Features register (X'1F1')
The Features register provides specific feature to a command. For instance, it is used with SET
FEATURES command to enable or disable caching.
(4) Sector Count register (X'1F2')
The Sector Count register indicates the number of sectors of data to be transferred in a read or
write operation between the host system and the device. When the value in this register is
X'00', the sector count is 256.
When this register indicates X'00' at the completion of the command execution, this indicates
that the command is completed successfully. If the command is not completed successfully,
this register indicates the number of sectors to be transferred to complete the request from the
host system. That is, this register indicates the number of remaining sectors that the data has
not been transferred due to the error.
The contents of this register has other definition for the following commands; INITIALIZE
DEVICE PARAMETERS, FORMAT TRACK, SET FEATURES, IDLE, STANDBY and SET
MULTIPLE MODE.
(5) Sector Number register (X'1F3')
The contents of this register indicates the starting sector number for the subsequent command.
The sector number should be between X'01' and [the number of sectors per track defined by
INITIALIZE DEVICE PARAMETERS command.
Under the LBA mode, this register indicates LBA bits 7 to 0.