5.4 Command Protocol
C141-E088-01EN 5-83
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.
• RECABLIBRATE
• SEEK
• READY VERIFY SECTOR(S)
• EXECUTE DEVICE DIAGNOSTIC
• INITIALIZE DEVICE PARAMETERS
• SET FEATURES
• SET MULTIPLE MODE
• SET MAX ADDRESS
• READ NATIVE MAX ADDRESS
• IDLE
• IDLE IMMEDIATE
• STANDBY
• STANDBY IMMEDIATE
• CHECK POWER MODE
• SECURITY ERASE PREPARE
• SECURITY FREEZE LOCK
• FLUSH CACHE
Figure 5.6 shows the protocol for the command execution without data transfer.