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9.9.5 Bit 3 (DRQ)
The Data Request is set when the Card requires information be transferred either to or from the host through the
Data register. The bit is cleared by the next command.
9.9.6 Bit 2 (CORR)
This bit is set when a Correctable data error has been encountered and the data has been corrected. This
condition does not terminate a multi-sector read operation.
9.9.7 Bit 1 (IDX)
This bit is always set to ‘0’.
9.9.8 Bit 0 (ERR)
This bit is set when the previous command has ended in some type of error. The bits in the Error register contain
additional information describing the error. In case of read or write access commands that end with an error, the
address of the first sector with an error is in the command block registers. This bit is cleared by the next
command.
Table 51: Status & Alternate Status Registe r
D7
BUSY
D6
RDY
D5
DWF
D4
DSC
D3
DRQ
D2
CORR
D1
0
D0
ERR
9.10 Device Control Register
The Device Control register is located at address 3F6h [376h], offset Eh.
This Write-only register is used to control the CompactFlash TM Memory Card interrupt request and to issue an ATA
soft reset to the Card. This register can be written even if the device is BUSY. The bits are defined as follows:
9.10.1 Bit 7 to 3
Don’t care. The host should reset this bit to ‘0’.
9.10.2 Bit 2 (SW Rst)
This bit is set to 1 in order to force the CompactFlash TM Storage Card to perform an AT Disk controller Soft Reset
operation. This clears Status Register and writes Diagnostic Code in Error register after a Write or Read Sector error.
The Card remains in Reset until this bit is reset to ‘0.’
9.10.3 Bit 1 (-Ien)
When the Interrupt Enable bit is set to ‘0’, - IREQ interrupts are enabled. When the bit is set to ‘1’, interrupts from
the Card are disabled. This bit also controls the Int bit in the Card Configuration and Status Registe r. It is set to ‘0’
at Power On.
9.10.4 Bit 0
This bit is set to ‘0’.
Table 52: Device Control Register
D7
X(0)
D6
X(0)
D5
X(0)
D4
X(0)
D3
X(0)
D2
SW Rst
D1
-Ien
D0
0
9.11 Card (Drive) Address Register
The Card (Drive) Address register is located at address 3F7h [377h], offset Fh.
This read-only register is provided for compatibility with the AT disk drive interface and can be used for
confirming the drive status. It is recommended that this register is not mapped into the host’s I/O space be cause
of potential conflicts on Bit 7. The bits are defined as follows:
9.11.1 Bit 7
This bit is don’t care.
Swissbit AG
Industriestrasse 4
Swissbit reserves the right to change products or specifications without notice.
Revision: 1.00
CH-9552 Bronschhofen
Switzerland
www.swissbit.com
industrial@swissbit.com
C-440_data_sheet_CF-HxBU_Rev100.doc
Page 54 of 102
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