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Toshiba Corporation Digital Media Network Company
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11.8.35 Set Features (EFh)
COMMAND CODE
1 1 1 0 1 1 1 1
REGISTER
REGISTER SETTING NORMAL COMPLETION
DR DRIVE No. no change
CY no change
HD no change
SN no change
SC Mode Selection for Data Transfer(*2) no change
FT Features(*1) no change
(*1) Features: FT register defines following selections.
02H Enable write cache feature
03H Select data transfer mode
05H Enable advanced power management
55H Disable read look-ahead feature
66H Disable reverting to power on defaults by soft reset
82H Disable write cache feature
85H Disable advanced power management
AAH Enable read look-ahead feature
CCH Enable reverting to power on defaults by soft reset
others Invalid (reporting with Aborted Command Error)
(*2)Mode selection for data transfer is specified in sector count register. Upper 5 bits show transfer mode
and lower 3 bits show mode figure.
PIO default transfer mode 00000 000
PIO default transfer mode, disable IORDY 00000 001
PIO flow control transfer mode nnn 00001 nnn
Multiword DMA mode nnn 00100 nnn
Ultra DMA mode nnn 01000 nnn
Reserved 10000 nnn
PIO default mode is mode 4 flow control. DMA default mode is Multiword DMA mode 2.
The level of Advanced Power Management function is set in Sector count register.
C0h-FEh Mode0 (Power save up to Low Power Idle)
80h-BFh Mode1 (Power save up to Low Power Idle)
01h-7Fh Mode2 (Power save up to Standby)
00h,FFh Aborted
Transition time of power save is changed dynamically in Mode1 and Mode2 due to Adaptive power control
function. The function level is set to Mode1 when Advanced Power Management function is disabled.
If FT register has any other value, the drive rejects the command with Abort Command error.
Default settings after power on or hard reset are:
Data transfer mode of Multiword DMA mode 2, PIO mode 4 flow control,
4 bytes ECC, look-ahead read enabled, write cache enabled, advanced power management enabled,
READ/WRITE Multiple command enabled (16 sectors)
and reverting to power on defaults by soft reset disabled.