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SMC032AF Datasheet(PDF) 46 Page - Numonyx B.V |
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SMC032AF Datasheet(HTML) 46 Page - Numonyx B.V |
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46 / 82 page  CF-ATA registers SMCxxxAF 46/82 8.6 Cylinder Low (LBA 15-8) register (address 1F4h [174h]; offset 4) This register contains the least significant 8 bits of the starting cylinder address or bits 15 to 8 of the logical block address. 8.7 Cylinder High (LBA 23-16) register (address 1F5h [175h]; offset 5) This register contains the most significant bits of the starting cylinder address or bits 23 to 16 of the logical block address. 8.8 Drive/Head (LBA 27-24) register (address 1F6h [176h]; offset 6) The Drive/Head register is used to select the drive and head. It is also used to select LBA addressing instead of cylinder/head/sector addressing. The bits are defined in Table 42. 8.8.1 Bit 7 This bit is set to ‘1’. 8.8.2 Bit 6 (LBA) LBA is a flag to select either Cylinder/Head/Sector (CHS) or Logical Block Address mode (LBA). When LBA is set to ‘0’, Cylinder/Head/Sector mode is selected. When LBA is set to ’1’, Logical Block Address mode is selected. In Logical Block Address mode, the logical block address is interpreted as follows: ● LBA7-LBA0: Sector Number register D7 to D0. ● LBA15-LBA8: Cylinder Low register D7 to D0. ● LBA23-LBA16: Cylinder High register D7 to D0. ● LBA27-LBA24: Drive/Head register bits HS3 to HS0. 8.8.3 Bit 5 This bit is set to ‘1’. 8.8.4 Bit 4 (DRV) DRV is the drive number. When DRV is ‘0’, drive/card 0 is selected (master). When DRV is ‘1’, drive/card 1 is selected (slave). The card is set to card 0 or 1 using the copy field (Drive #) of the PCMCIA Socket & Copy configuration register. 8.8.5 Bit 3 (HS3) When operating in the Cylinder, Head, Sector mode, this is bit 3 of the head number. It is bit 27 in the Logical Block Address mode. |
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