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SMC032AF bảng dữ liệu(PDF) 50 Page - Numonyx B.V

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SMC032AF bảng dữ liệu(HTML) 50 Page - Numonyx B.V

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CF-ATA registers
SMCxxxAF
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8.11
Card (drive) address register (address 3f7h [377h]; offset Fh)
This read-only register is provided for compatibility with the AT disk drive interface and can
be used for confirming the drive status. It is recommended that this register is not mapped
into the host’s I/O space because of potential conflicts on bit 7. The bits are defined as
follows:
8.11.1
Bit 7
This bit is Don’t care.
8.11.2
Bit 6 (–WTG)
This bit is ‘0’ when a write operation is in progress, otherwise, it is ‘1’.
8.11.3
Bit 5 (–HS3)
This bit is the negation of bit 3 in the drive/head register.
8.11.4
Bit 4 (–HS2)
This bit is the negation of bit 2 in the drive/head register.
8.11.5
Bit 3 (–HS1)
This bit is the negation of bit 1 in the drive/head register.
8.11.6
Bit 2 (–HS0)
This bit is the negation of bit 0 in the drive/head register.
8.11.7
Bit 1 (–nDS1)
This bit is ‘0’ when drive 1 is active and selected.
8.11.8
Bit 0 (–nDS0)
This bit is ‘0’ when the drive 0 is active and selected.
Table 45.
Card (drive) address register
D7
D6
D5
D4
D3
D2
D1
D0
X
–WTG
–HS3
–HS2
–HS1
–HS0
–nDS1
–nDS0



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