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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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SMC032AF 데이터시트(PDF) 50 Page - Numonyx B.V |
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SMC032AF 데이터시트(HTML) 50 Page - Numonyx B.V |
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50 / 82 page  CF-ATA registers SMCxxxAF 50/82 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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