OXCB950
OXFORD SEMICONDUCTOR LTD.
6.2 Configuration space
The device dependant region of the PCI configuration
space contains the cardbus/pci Power Management
Extended Capability register set and (for the cardbus mode
only) the Tuples making up the Cardbus Information
Structure.
The OXCB950 is a single function device, with one PCI
configuration space (and for the default cardbus mode, one
cardbus information structure).
The format of the PCI configuration space, for cardbus and
pci modes, is as shown in the Table below.
All the required fields in the predefined PCI header region
have been implemented. This includes those fields in the
cardbus PC Card Standard that are termed “allocated” and
“reserved” for cardbus applications. This implementation is
a specific requirement for cardbus support in Windows 9x.
In general, writes to any registers that are not implemented
are ignored, and all reads from unimplemented registers
return 0.
6.2.1 Cardbus / PCI Configuration Space Register map
Configuration Register Description
Offset
Address
00h
31
16
15
0
Device ID
Status
Vendor ID
Command
04h
Class Code
Header Type
Revision ID
Reserved
08h
1
BIST
Reserved
0Ch
Base Address Register 0 (BAR0) – UART Function in I/O space
Base Address Register 1 (BAR 1) - UART Function in Memory space
10h
14h
Base Address Register 2 (BAR 2) – Local Configuration Registers in IO space
Base Address Register 3 (BAR3) – Local Configuration Registers in Memory space
Base Address Register 4 (BAR4) – Cardbus Status Registers in Memory Space
Function Event : Offset +0
18h
1Ch
20h
Function Event Mask : Offset +4
Function Present State : Offset +8
Function Force Event : Offset +12
Reserved (Bar 5)
24h
28h
2Ch
30h
34h
38h
3Ch
Cardbus CIS Pointer
Subsystem ID
Subsystem Vendor ID
Cap_Ptr
Reserved
Reserved
Reserved
Reserved
Reserved
Interrupt Pin
Interrupt Line
Predefined PCI Header Region
Device Dependent PCI Region
Power Management Capabilities (PMC)
Next Ptr
Cap_ID
40h
44h
48h
4Ch
Reserved
Reserved
PMC Control/Status Register (PMCSR)
Tuple Byte3*
Tuple Byte 2*
Tuple Byte1*
Tuple Byte 0*
Tuple Byte n*
…
Tuple Byte (n+1)*
* Tuples are available for the Cardbus mode only. These fields return all 0’s for the PCI mode of the device.
Table 2: Cardbus/PCI Configuration space
DS-0033 Sep 05
External-Free Release
Page 14
OXFORD [ OXFORD SEMICONDUCTOR ]
