SanDisk SDCFRX4-2048-901 Product Manual - Page 53
Card Drive Address Register con't
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SanDisk CompactFlash Card OEM Product Manual ATA Register Set and Protocol Card (Drive) Address Register (con't) Bit Name Description D7 X This bit is unknown. Implementation Note: Conflicts may occur on the host data bus when this bit is provided by a Floppy Disk Controller operating at the same addresses as the CompactFlash Memory Card. Following are some possible solutions to this problem for the PCMCIA implementation: 1. Locate the CompactFlash Memory Card at a non-conflicting address, i.e., Secondary address (377) or in an independently decoded Address Space when a Floppy Disk Controller is located at primary addresses. 2. Do not install a Floppy and a CompactFlash Memory Card in the system at the same time 3. Implement a socket adapter that can be programmed to (conditionally) tri-state D7 of I/0 address 3F7/377 when a CompactFlash Memory Card is installed and conversely to tri-state D6-D0 of I/O address 3F7/377 when a floppy controller is installed 4. Do not use the card's Drive Address Register. This may be accomplished by either a) If possible, program the host adapter to enable only I/O addresses 1F0-1F7, 3F6 (or 170-177, 176) to the card or b) if provided use an additional primary/secondary configuration in the card that does not respond to accesses to I/O locations 3F7 and 377. With either of these implementations, the host software must not attempt to use information in the Drive Address Register. D6 -WTG This bit is 0 when a write operation is in progress, otherwise, it is 1. D5 -HS3 This bit is the negation of bit 3 in the Drive/Head Register. D4 -HS2 This bit is the negation of bit 2 in the Drive/Head Register. D3 -HS1 This bit is the negation of bit 1 in the Drive/Head Register. D2 -HS0 This bit is the negation of bit 0 in the Drive/Head Register. D1 -nDS1 This bit is 0 when drive 1 is active and selected. D0 -nDS0 This bit is 0 when the drive 0 is active and selected. © 2007 SanDisk Corporation 4-9 Rev. 12.0, 02/07