smc256af Numonyx, smc256af Datasheet - Page 50

• Manufacturer Part Number: smc256af
• Description: 32 Mbyte, 64 Mbyte, 128 Mbyte, 256 Mbyte And 512 Mbyte 3.3 V / 5 V Supply Compactflash? Card
• Manufacturer: Numonyx

CF-ATA registers
8.11
8.11.1
8.11.2
8.11.3
8.11.4
8.11.5
8.11.6
8.11.7
8.11.8
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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:
Bit 7
This bit is Don’t care.
Bit 6 (–WTG)
This bit is ‘0’ when a write operation is in progress, otherwise, it is ‘1’.
Bit 5 (–HS3)
This bit is the negation of bit 3 in the drive/head register.
Bit 4 (–HS2)
This bit is the negation of bit 2 in the drive/head register.
Bit 3 (–HS1)
This bit is the negation of bit 1 in the drive/head register.
Bit 2 (–HS0)
This bit is the negation of bit 0 in the drive/head register.
Bit 1 (–nDS1)
This bit is ‘0’ when drive 1 is active and selected.
Bit 0 (–nDS0)
This bit is ‘0’ when the drive 0 is active and selected.
Table 45.
D7
X
Card (drive) address register
–WTG
D6
–HS3
D5
–HS2
D4
–HS1
D3
–HS0
D2
–nDS1
D1
SMCxxxAF
–nDS0
D0