Interface
(6)Cylinder High Field (exp)
The contents of this field indicates
At the end of a command, the contents of this field are updated to the current cylinder number. The
Under the LBA mode, this field indicates LBA bits 23 to 16. Under the LBA mode of the EXT system command, LBA bits 47 to 40 are set in the Cylinder High Field, and LBA bits 23 to 16 are set in the Cylinder High Field (exp).
(7)Device/Head Field
The contents of this field indicate the device and the head number.
When executing INITIALIZE DEVICE PARAMETERS command, the contents of this field defines “the number of heads minus 1” (a maximum head No.).
Bit 7 | Bit 6 | Bit 5 | Bit 4 | Bit 3 | Bit 2 | Bit 1 | Bit 0 |
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X | L | X | X | HS3 | HS2 | HS1 | HS0 |
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-Bit 7: Unused
-Bit 6: L 0 for CHS mode and 1 for LBA mode.
-Bit 5: Unused
-Bit 4: Unused
- Bit 3: | HS3 | CHS mode head address 3 (23). bit 27 for LBA mode. |
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| Unused under the LBA mode of the EXT command. |
- Bit 2: | HS2 | CHS mode head address 2 (22). bit 26 for LBA mode. |
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| Unused under the LBA mode of the EXT command. |
- Bit 1: | HS1 | CHS mode head address 1 (21). bit 25 for LBA mode. |
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| Unused under the LBA mode of the EXT command. |
- Bit 0: | HS0 | CHS mode head address 0 (20). bit 24 for LBA mode. |
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| Unused under the LBA mode of the EXT command. |