User Manual

ATA Drive Register Set Definition and Protocol

CompactFlash

Table 4-6. Data Register

Data Register CE2- CE1- A0 Offset Data Bus

Word Data Register 0 0 X 0,8,9 D15-D0

Even Data Register 1 0 0 0,8 D7-D0

Odd Data Register 1 0 1 9 D7-D0

Odd Data Register 0 1 X 8,9 D15-D8

Error/Feature Register 1 0 1 1, Dh D7-D0

Error/Feature Register 0 1 X 1 D15-D8

Error/Feature Register 0 0 X Dh D15-D8

4.5.2. Error Register (Address—1F1[171]; 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. The bits are defined as follows:

D7 D6 D5 D4 D3 D2 D1 D0

BBK UNC 0 IDNF 0 ABRT 0 AMNF

This register is also accessed on data bits D15-D8 during a write operation to offset 0 with -CE2 low and -CE1 high.

Bit 7 (BBK) This bit is set when a Bad Block is detected.

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 Memory 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.

4.5.3. Feature Register (Address—1F1[171]; Offset 1, 0Dh Write Only

This register provides information regarding features of the CompactFlash Memory Card that the host can utilize.

This register is also accessed on data bits D15-D8 during a write operation to Offset 0 with -CE2 low and -CE1

high.

4.5.4. Sector Count Register (Address—1F2[172]; Offset 2)

This register contains the number of sectors of data requested to be transferred on a read or write operation between

the host and the CompactFlash Memory Card. If the value in this register is zero, a count of 256 sectors is specified.

If the command was successful, this register is zero at command completion. If not successfully completed, the