参数资料
型号: SMC032BFY6E
厂商: NUMONYX
元件分类: PROM
英文描述: 4M X 8 FLASH 3.3V PROM CARD, 300 ns, UUC50
封装: LEAD FREE, CARD-50
文件页数: 49/90页
文件大小: 1863K
代理商: SMC032BFY6E
SMCxxxBF
CF-ATA registers
9.11
Card (drive) address register
The card (drive) address register is located at 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.
9.11.1
Bit 7
This bit is don’t care.
9.11.2
Bit 6 (–WTG)
This bit is ‘0’ when a write operation is in progress, otherwise, it is ‘1’.
9.11.3
Bit 5 (–HS3)
This bit is the negation of bit 3 in the drive/head register.
9.11.4
Bit 4 (–HS2)
This bit is the negation of bit 2 in the drive/head register.
9.11.5
Bit 3 (–HS1)
This bit is the negation of bit 1 in the drive/head register.
9.11.6
Bit 2 (–HS0)
This bit is the negation of bit 0 in the drive/head register.
9.11.7
Bit 1 (–nDS1)
This bit is ‘0’ when drive 1 is active and selected.
9.11.8
Bit 0 (–nDS0)
This bit is ‘0’ when the drive 0 is active and selected.
Table 47.
Card (drive) address register
D7
D6
D5
D4
D3
D2
D1
D0
X
–WTG
–HS3
–HS2
–HS1
–HS0
–nDS1
–nDS0
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