smc256af Numonyx, smc256af Datasheet - Page 46

• 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
8.6
8.7
8.8
8.8.1
8.8.2
8.8.3
8.8.4
8.8.5
46/82
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.
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.
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
Bit 7
This bit is set to ‘1’.
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:
Bit 5
This bit is set to ‘1’.
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.
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.
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.
Table
SMCxxxAF
42.