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8.6.1 Word 0: General Configuration
This field indicates the general characteristics of the device.
The default value for Word 0 is set to 045Ah.
Some operating systems require Bit 6 of Word 0 to be set to ‘1’ (Non -removable device) to use the drive as
the root storage device.
8.6.2 Word 1: Default Number of Cylinders
This field contains the number of translated cylinders in the default translation mode. This value will be the
same as the number of cylinders.
8.6.3 Word 3: Default Number of Heads
This field contains the number of translated heads in the default translation mode.
8.6.4 Word 6: Default Number of Sectors per Track
This field contains the number of sectors per track in the default translation mode.
8.6.5 Word 7-8: Number of Sectors per Drive
This field contains the number of sectors per Drive. This double Word value is also the first invalid address
in LBA translation mode.
8.6.6 Word 10-19: Memory Drive Serial Number
The contents of this field are right justified and padded without spaces (20h).
8.6.7 Word 23-26: Firmware Revision
This field contains the revision of the firmware for this product.
8.6.8 Word 27-46: Model Number
This field contains the model number for this product and is left justified and padded with spaces (20h).
8.6.9 Word 47: Read/Write Multiple Sector Count
This field contains the maximum number of sectors that can be read or written per interrupt using the Read
Multiple or Write Multiple commands.
8.6.10 Word 49: Capabilities
Bit 13 Standby Timer: is set to ’0’ to indicate that the Standby timer operation is defined by the
manufacturer.
Bit 11: IORDY Supported
If bit 11 is set to 1 then this drive supports IORDY operation.
If bit 11 is set to 0 then this drive may support IORDY operation.
Bit 10: IORDY may be disabled
If bit 10 is set to 1 then IODRDY may be disabled.
Bit 9 LBA support: drive support LBA mode addressing.
Bit 8 DMA Support: Read/Write DMA commands are supported.
8.6.11 Word 51: PIO Data Transfer Cycle Timing Mode
This field defines the mode for PIO data transfer. For backward compatibility with BIOSs written before Word
64 was defined for advanced modes, a device reports in Word 51, the highest original PIO mode it can
support (PIO mode 0, 1 or 2). Bits 15-8: are set to 02H.
8.6.12 Word 53: Translation Parameter Valid
Bit 0: is set to ‘ 1 ’ to indicate that Words 54 to 58 are valid
Bit 1: is set to ‘1’ to indicate that Words 64 to 70 are valid
Bit 2 shall be set to 1 indicating that word 88 is valid and reflects the supported True IDE UDMA
Swissbit AG
Industriestrasse 4
Swissbit reserves the right to change products or specifications without notice.
Revision: 1.00
CH-9552 Bronschhofen
Switzerland
www.swissbit.com
industrial@swissbit.com
P-120_data_sheet_PA-QxBO_Rev100.doc
Page 42 of 76
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