spd6722qcce Intel Corporation, spd6722qcce Datasheet - Page 41
spd6722qcce
Manufacturer Part Number
spd6722qcce
Description
Isa-to-pc-card Pcmcia Controllers
Manufacturer
Intel Corporation
Datasheet
1.SPD6722QCCE.pdf
(138 pages)
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6.0
6.1
Datasheet
Register Name: Index
Index: n/a
Device Index
RW:0
Bit 7
Socket Index
Operation Registers
The PD67XX internal registers are accessed through a pair of Operation registers — an Index
register and a Data register. The Index register is accessed at address 03E0h, and the Data register
is accessed at 03E1h.
Index
The Data register is accessed at 03E1h.
Bits 5:0 — Register Index
These bits determine which of the 64 possible socket-specific registers will be accessed when the
Data register is next accessed by the processor. Note that some values of the Register Index field
are reserved (see
Bit 6 — Socket Index
This bit determines which set of socket-specific registers is currently selected. When this bit is ‘0’,
a Socket A register is selected. When this bit is ‘1’, a Socket B register is selected. Note that the
PD6710 supports one socket, and the PD6722 supports two sockets.
Bit 7 — Device Index
In systems where two PD67XXs are used, this bit differentiates between them.
The Index register value determines which internal register should be accessed (read or written) in
response to each CPU access of the Data register. Each of the possible PC Card sockets is allocated
64 of the 256 locations in the internal register index space
RW:0
Bit 6
Table 11 on page
Bit 5
Bit 4
42).
ISA-to-PC-Card (PCMCIA) Controllers — PD6710/’22
Bit 3
Register Index
RW:000000
Bit 2
Register Compatibility Type: 365
Bit 1
Register Per: chip
Bit 0
41
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