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Toshiba 4006GAH Manual Do Utilizador

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360050398 
 
Toshiba Corporation Digital Media Network Company 
 
Page 98 of 157 
© 2005, Copyright TOSHIBA Corporation All Rights Reserved 
 
10.8.35  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.