4.4 Various Processes

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.

UNIT ATTENTION is generated.

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.

C156-E205-01EN

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Fujitsu MCJ3230AP manual Various Processes, Reset response