OXCFU950_07 Datasheet, PDF (24/74 Pages) Oxford Semiconductor – USB/UART multi-function 16-bit PC Card device

OXFORD SEMICONDUCTOR, INC.
OXCFU950 DATA SHEET
6.7.2 Configuration Status Register—CSR (Offset 0x02)
The configuration and status register is an optional register supported by the OXCFU950. The register allows additional control
over function configuration and reports the configuration status.
D7
D6
D5
D4
D3
D2
D1
D0
Changed
SigChg
IOIs8
RFU
Audio
PwrDwn
Intr
IntrAck
Field
Changed
Type Description
R
If a 16-bit PC Card or CompactFlash/CF+ card is using the I/O interface, the pin replacement register for the
function is present & one or more of the state change signals in the pin replacement register are set to 1, or one of
the Event bits in the extended status register is 1 and the corresponding Enable bit is 1, the function sets this field
to 1.
SigChg
If a 16-bit PC Card or CompactFlash/CF+ card is not using the I/O interface or the pin replacement register for the
function is not present, this field is undefined and should be ignored.
R/W This field serves as a gate for STSCHG#
If a 16-bit PC Card or CompactFlash/CF+ card is using the I/O interface & both the Changed and SigChg fields are
set to 1, the function asserts STSCHG#.
If a 16-bit PC Card or CompactFlash/CF+ card is using the I/O interface and this field is reset to 0, the function
does not assert STSCHG#.
IOIs8
RFU
Audio¹
PwdDwn²
If a 16-bit PC Card or CompactFlash/CF+ card is not using the I/O interface or the pin replacement register for the
function is not present, this field is undefined and should be ignored.
R/W The host sets this field to 1 when it can provide I/O cycles only with an 8-bit D[7..0] data path. The card is
guaranteed that accesses to the 16-bit registers will occur as two byte accesses rather than as a single 16-bit
access.
-
Reserved. Must be 0.
R/W This bit is set to 1 to enable audio information on SPKR# when the card is configured. Not used: 0
R/W When the host sets this field to 1, the function enters a power-down state, if such a state exists. Not used: 0
If a 16-bit PC Card or CompactFlash/CF+ card function does not have a power-down state, the function ignores this
field.
Intr
R
Interrupt request/acknowledge – This field reports whether the function is requesting interrupt servicing and may be
used to acknowledge the host system is ready to process another interrupt request from the 16-bit PC Card or
CompactFlash/CF+ card.
The function shall set this field to 1 when it is requesting interrupt service. The function sets this field to 0 when it is
not requesting interrupt service.
IntrAck
Writes to this field are ignored when the IntrAck field of all configuration and status registers on the 16-bit PC Card
or CompactFlash/CF+ card are reset to 0.
R/W Single function cards ignore this field on writes and always return 0.
Table 7: Configuration Status Register
Note 1
Audio is not supported on the device.
Note 2
The OXCFU950 does not support a specific power-down mode, because it is a low power device that features a number of sleep
modes (see Section 6.7 for further details).
DS-0023 February 2007
External—Free Release
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