FUJITSU MCM3064AP - Manual (Page 83)

4.4 Various Processes
C156-E227-01EN 4-13
4.4 Various Processes
4.4.1 Reset response
There are four types of resets.
• Power-on reset
−
The ODD performs initialization such as initial diagnostics and default
setting. If any media is mounted, it also spins up media.
• Hardware reset
−
The ODD is reset when the RESET- signal is asserted. The ODD
initializes the interface controller by setting default values.
• ATA software reset
−
The ODD is reset when the SRST bit of the Device Control register is set.
−
The device driver should not use the SRST bit to reset the ODD (except
for restore from sleep mode).
−
After ATA software reset, the ODD initializes the task file as shown
below.
Status = 00h
Error = (Depending on the SRST sequence)
Sector Count = 01h
Sector number = 01h
Cylinder Low = 14h
Cylinder High = EBh
Drive/Head = 00h
−
DRDY is set to 1 with the first command after ATA reset.
−
If ATA software reset is issued while the ODD is selected and a
command is being executed (BSY = 1 or DRQ = 1), the command is
interrupted. Otherwise, the ODD continues command processing.
−
The contents set with the MODE SELECT and Set Features commands
remain unchanged.
• ATAPI reset
−
The ODD is reset with a DEVICE RESET command. The ODD
interrupts the current command.