Texas Instruments OMAP5912 Reference Manual page 893

Table 51. CFC Status Register (CF_STATUS_REG)
Bit Name
15:3
2 Last read access
1 Last write access
0 Card detect
Table 52. CFC Configuration Register (CF_CFG_REG)
Bit Name
15:4
3 Chip-select 3
configuration
2 Chip-select 2
configuration
SPRU756A
Function
Unused
Bad read access (active low)
When a CompactFlash read access is performed and the
CompactFlash card is not correctly connected (Card Detect
is high), the CFC asserts this bit low.
Bad write access (active low)
When a CompactFlash write access is performed and the
CompactFlash card is not correctly connected (Card Detect
is high), the CFC asserts this bit low.
CompactFlash correctly connected
When CompactFlash is correctly connected, the card detect
is low and this bit is asserted low.
The status register represents the connected or disconnected states of the
CompactFlash. When a CompactFlash is written, an interrupt request is
generated.
After this interruption, the status register must be accessed through the TIPB
bus following an interrupt subroutine. The register contains data about the
CompactFlash connection (connected or not) and current data transfer (read
access, write access, or no access).
If a CompactFlash access is attempted while the CompactFlash card is not
correctly connected, the last access direction is written in the status register
to inform the system that the last transfer has not been completed.
Function
Unused
Chip-select is connected on chip-select 3 (active low).
Any transfer to CS_3 is a CompactFlash access.
Chip-select is actually connected on chip-select 2 (active
low).
Any transfer to CS_2 is a CompactFlash access.
CompactFlash Controller
Reset
0x1FFF
0x1
0x1
Undefined
Reset
0xFFF
0x1
0x1
Memory Interfaces 87