OXCF950_06 Datasheet, PDF (21/66 Pages) Oxford Semiconductor – low cost asynchronous 16-bit PC card or Compact Flash UART device

OXFORD SEMICONDUCTOR, INC.
OXCF950 rev B DATA SHEET
5.5.2 Configuration Status Register ‘CSR’ (Offset 0xFA)
The Configuration and Status Register is an optional register, supported by the OXCF950. The register allows additional control
over a function’s configuration and reports status related to the function’s configuration.
D7
D6
D5
D4
D3
D2
D1
D0
Changed
SigChg
IOIs8
RFU
Audio
PwrDwn
Intr
IntrAck
Field
Changed
Type
Description
R
If a PCMCIA/CF card is using the I/O interface, the function’s Pin Replacement
register is present and one or more of the state change signals in the Pin
Replacement Register are set to one(1), or one Event bits in the Extended Status
Register are set (1) and the corresponding Enable bit is set (1), the function shall
set this field to one (1).
SigChg¹
If a PCMCIA/CF card is not using the I/O interface or the function’s Pin
Replacement register is not present, this field is undefined and should be
ignored.
R/W
This field serves as a gate for STSCHG#
If a PCMCIA/CF card is using the I/O interface and both the Changed and
SigChg fields are set to one (1), the function shall assert STSCHG#.
If a PCMCIA/CF card is using the I/O interface and this field is reset to zero (0),
the function shall not assert STSCHG#.
IOIs8
RFU
Audio²
PwdDwn³
If a PCMCIA/CF card is not using the I/O interface or the function’s Pin
Replacement register is not present, this field is undefined and should be
ignored.
R/W
The host sets this field to one (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 zero (0).
R/W
This bit is set to one (1) to enable audio information on SPKR# when the card is
configured.
R/W
When the host sets this field to one (1), the function shall enter a power-down
state, if such a state exists.
If a PCMCIA/CF card function does not have a power-down state, the function
shall ignore 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 PCMCIA/CF card.
The function shall set this field to one (1) when it is requesting interrupt service.
The function shall set this field to zero (0) when it is not requesting interrupt
service.
Writes to this field are ignored when the IntrAck field of all Configuration and
Status Registers on the PCMCIA/CF card are reset to zero (0).
IntrAck
R/W
Single function cards ignore this field on writes and always return zero (0).
Table 18: Configuration Status Register
Note 1
DS-0027 Feb 06
External—Free Release
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