CL-PD6833
PCI-to-CardBus Host Adapter
9.1
I/O Window Mapping Registers
I/O Window Control
9.1.1
Register Name: I/O Window Control
I/O Index: 07h
Register Per: socket
Register Compatibility Type: 365
Memory Offset: 807h
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Timing
Register
Select 1
Timing
Register
Select 0
Compatibility Auto-Size I/O I/O Window 1
Compatibility Auto-Size I/O I/O Window 0
Bit
Window 1
R/W:0
Size
Bit
Window 0
R/W:0
Size
R/W:0
R/W:0
R/W:0
R/W:0
R/W:0
R/W:0
Bit 0 — I/O Window 0 Size
8-bit data path to I/O Window 0.
16-bit data path to I/O Window 0.
0
1
When bit 1 of this register is ‘0’, this bit determines the width of the data path for I/O Window 0
accesses to the card. When bit 1 is ‘1’, this bit is ignored.
Bit 1 — Auto-Size I/O Window 0
0
1
I/O Window 0 Size (see bit 0 of this register) determines the data path for I/O Window 0 accesses.
The data path to I/O Window 0 is determined by the IOIS16# signal returned by the card.
This bit determines the width of the data path for I/O Window 0 accesses to the card. Note that
when this bit is ‘1’, the IOIS16# signal determines the width of the data path to the card.
Bit 2 — Compatibility Bit
Bit 3 — Timing Register Select 0
0
1
Accesses made with timing specified in Timer Set 0 registers.
Accesses made with timing specified in Timer Set 1 registers.
This bit determines the access timing specification for I/O Window 0.
Bit 4 — I/O Window 1 Size
0
8-bit data path to I/O Window 1.
16-bit data path to I/O Window 1.
1
When bit 5 of this register is ‘0’, this bit determines the width of the data path for I/O Window 1
accesses to the card. When bit 5 is ‘1’, this bit is ignored.
Bit 5 — Auto-Size I/O Window 1
0
1
I/O Window 1 Size (see bit 4 of this register) determines the data path for I/O Window 1 accesses.
The data path to I/O Window 1 is determined based on IOIS16# returned by the card.
This bit determines the width of the data path for I/O Window 1 accesses to the card. Note that
when this bit is ‘1’, the IOIS16# signal determines the width of the data path to the card.
June 1998
105
ADVANCE DATA BOOK v0.3
WINDOW MAPPING REGISTERS
CIRRUS [ CIRRUS LOGIC ]
