360050398
10.8.35 Set Features | (EFh) |
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| COMMAND CODE |
| 1 1 1 0 1 1 1 1 | REGISTER | |
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| REGISTER SETTING | NORMAL COMPLETION | ||
| DR |
| DRIVE No. | no change | |
| CY |
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| no change |
| HD |
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| no change |
| SN |
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| 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 |
66H | Disable reverting to power on defaults by soft reset |
82H | Disable write cache feature |
85H | Disable advanced power management |
AAH | Enable read |
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.
…… | Mode0 (Power save up to | Low Power Idle) | ||
…… | Mode1 | (Power save up to | Low Power Idle) | |
…… | Mode2 | (Power save up to | Standby) | |
00h,FFh | …… | Aborted |
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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,
and reverting to power on defaults by soft reset disabled.
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