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4.4 Various Processes
C156-E205-01EN 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.
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UNIT ATTENTION is generated.
!
ATA software reset
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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).
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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.