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400X CompactFlash Card
Transcend Information Inc.
V1.0
54
CF-ATA Registers
The following section describes the hardware registers used by the host software to issue commands to the
CompactFlash device. These registers are often collectively referred to as the “task file.”
Data Register (Address - 1F0h[170h];Offset 0,8,9)
The Data Register is a 16 bit register, and it is used to transfer data blocks between the CompactFlash Storage
Card data buffer and the Host. This register overlaps the Error Register.
Error Register
(Address - 1F1h[171h]; Offset 1, 0Dh Read Only)
This register contains additional information about the source of an error when an error is indicated in bit 0 of the
Status register.
This register is also accessed in PC Card Modes on data bits D15-D8 during a read operation to offset 0 with
-CE2 low and -CE1 high.
Bit 7 (BBK/ICRC)
: this bit is set when a Bad Block is detected. This bit is also set when an interface CRC error is
detected in True IDE Ultra DMA modes of operation.
Bit 6 (UNC)
: this bit is set when an Uncorrectable Error is encountered.
Bit 5
: this bit is 0.
Bit 4 (IDNF)
: the requested sector ID is in error or cannot be found.
Bit 3
: this bit is 0.
Bit 2 (Abort)
This bit is set if the command has been aborted because of a CompactFlash Storage Card status
condition: (Not Ready, Write Fault, etc.) or when an invalid command has been issued.
Bit 1
This bit is 0.
Bit 0 (AMNF)
This bit is set in case of a general error.