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Note:
For transfer of a sector of data, the host needs to read Status register (X'1F7') in order to clear
INTRQ (interrupt) signal. The Status register should be read within a period from the DRQ
setting by the device to 50 µs after the completion of the sector data transfer. Note that the
host does not need to read the Status register for the first and the last sector to be transferred.
If the timing to read the Status register does not meet above condition, normal data transfer
operation is not assured guaranteed.
When the host issues the command even if the drive requests the data transfer (DRQ bit is set),
or when the host executes resetting, the device correct operation is not guaranteed.
5.4.3 Commands without data transfer
Execution of the following commands does not involve data transfer between the host and the
device.
• RECALIBRATE
• SEEK
• READY VERIFY SECTOR(S)
• EXECUTE DEVICE DIAGNOSTIC
• INITIALIZE DEVICE PARAMETERS
• SET FEATURES
• SET MULTIPLE MODE
• IDLE
• IDLE IMMEDIATE
• STANDBY
• STANDBY IMMEDIATE
• CHECK POWER MODE
• SMART: except for SMART Read Attribute values and SMART Read Attribute Thresholds
Figure 5.6 shows the protocol for the command execution without data transfer.
Status read
Command
BSY
INTRQ
DRDY
~
Parameter write
Figure 5.6 Protocol for the command execution without data transfer