PCI1251B Datasheet, PDF (86/126 Pages) Texas Instruments – PC CARD CONTROLLER

PCI1251B GFN/GJG
PC CARD CONTROLLER
SCPS043A – OCTOBER 1998
ExCA address window enable register (index 06h)
Bit
7
6
5
4
3
2
1
0
Name
ExCA address window enable
Type
R/W
R/W
R
R/W
R/W
R/W
R/W
R/W
Default
0
0
0
0
0
0
0
0
Register: ExCA address window enable
Type:
Read-only, Read/Write (see individual bit descriptions)
Offset:
CardBus socket address + 806h: Card A ExCA offset 06h
Card B ExCA offset 46h
Default: 00h
Description: This register enables/disables the memory and I/O windows to the 16-bit PC Card. By default,
all windows to the card are disabled. The PCI1251B does not acknowledge PCI memory or I/O
cycles to the card if the corresponding enable bit in this register is 0, regardless of the
programming of the memory or I/O window start/end/offset address registers. Refer to
Table 56 for a complete description of the register contents.
Table 56. ExCA Address Window Enable Register (Index 06h)
BIT
SIGNAL
TYPE
FUNCTION
I/O window 1 enable. Bit 7 enables/disables I/O window 1 for the PC Card. This bit is encoded as:
7
IOWIN1EN R/W
0 = I/O window 1 disabled (default)
1 = I/O window 1 enabled
I/O window 0 enable. Bit 6 enables/disables I/O window 0 for the PC Card. This bit is encoded as:
6
IOWIN0EN R/W
0 = I/O window 0 disabled (default)
1 = I/O window 0 enabled
5
RSVD
R
Reserved. Bit 5 returns 0 when read. Writes have no effect.
Memory window 4 enable. Bit 4 enables/disables memory window 4 for the PC Card. This bit is
4
MEMWIN4EN R/W
encoded as:
0 = Memory window 4 disabled (default)
1 = Memory window 4 enabled
Memory window 3 enable. Bit 3 enables/disables memory window 3 for the PC Card. This bit is
3
MEMWIN3EN R/W
encoded as:
0 = Memory window 3 disabled (default)
1 = Memory window 3 enabled
Memory window 2 enable. Bit 2 enables/disables memory window 2 for the PC Card. This bit is
2
MEMWIN2EN R/W
encoded as:
0 = Memory window 2 disabled (default)
1 = Memory window 2 enabled
Memory window 1 enable. Bit 1 enables/disables memory window 1 for the PC Card. This bit is
1
MEMWIN1EN R/W
encoded as:
0 = Memory window 1 disabled (default)
1 = Memory window 1 enabled
Memory window 0 enable. Bit 0 enables/disables memory window 0 for the PC Card. This bit is
0
MEMWIN0EN R/W
encoded as:
0 = Memory window 0 disabled (default)
1 = Memory window 0 enabled
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