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Toshiba Corporation Digital Media Network Company
Page 85 of 157
© 2005, Copyright TOSHIBA Corporation All Rights Reserved
WORD 47:
bit 15 - 8 shall be set to 80h
bit 7 - 0 Maximum number of sectors that can be transferred per interrupt on READ/WRITE MULTIPLE
commands.
The default value for this WORD is 8010h.
WORD 48: Reserved
WORD 49: Capabilities
bit 15-14 0=Reserved
bit 13 1=Standby timer value shall be as specified in ATA-/ ATAPI-6 specification
0=Standby timer value are vendor specific
bit 12 Reserved (For advanced PIO mode support)
bit 11 1=IORDY is supported.
bit 10 1=IORDY function can be disabled.
bit 9 1=LBA supported
bit 8 1=DMA supported
bit 7- 0 Reserved
The value for this WORD is 2F00h.
WORD 50: Capabilities
bit 15 0 (Fixed)
bit 14 1 (Fixed)
bit 13-1 Reserved
bit 0 1=device has a minimum Standby timer value that is device specific.
Standby timer value is set to 5 minutes or more. The value for this WORD is 4000h.
WORD 51: PIO data transfer cycle timing mode
bit 15- 8 PIO data transfer cycle timing mode
bit 7- 0 Reserved
The value returned in Bits 15-8 should fall into one of the mode 0 through mode.
Note: For backwards compatibility with BIOS written before Word 64 was defined for advanced modes, a
device reports in Word 51 the highest original PIO mode (i.e. PIO mode 0, 1, or 2) it can support.
The value for this WORD is 0200h.
WORD 52: Reserved
WORD 53:
bit15- 3 Reserved
bit 2 1= the fields reported in word 88 is valid
bit 1 1= the fields reported in words 64 70 are valid
bit 0 1= the fields reported in words 54 58 are valid
If the number of heads and sectors exceed the drive parameter, bit 0 and related WORD 54-58 shall be
cleared to 0. The default value for this WORD is 0007h.
WORD 54: Number of current cylinders defined by INITIALIZE DEVICE PARAMETERS command
WORD 55: Number of current heads defined by INITIALIZE DEVICE PARAMETERS command
WORD 56: Number of current sectors/track defined by INITIALIZE DEVICE PARAMETERS command