Datasheet

5−6
5.3 ExCA Power Control Register
The ExCA power control register provides PC Card power control. Bit 7 (COE) of this register controls the 16-bit output
enables on the socket interface, and can be used for power management in 16-bit PC Card applications. See
Table 5−4 and Table 5−5 for a complete description of the register contents.
The controller supports both the 82365SL and 82365SL-DF register models. Bits 3−0 (365REV) of the ExCA
identification and revision register (ExCA offset 00h, see Section 5.1) control which register model is supported.
Bit 7 6 5 4 3 2 1 0
Default 0 0 0 0 0 0 0 0
Register: ExCA power control—82365SL support
Offset: CardBus socket address + 802h; ExCA offset 02h
Type: Read-only, Read/Write
Default: 00h
Table 5−4. ExCA Power Control Register Description—82365SL Support
BIT SIGNAL TYPE FUNCTION
7 COE RW
Card output enable. Bit 7 controls the state of all of the 16-bit outputs on the controller. This bit is
encoded as:
0 = 16-bit PC Card outputs disabled (default)
1 = 16-bit PC Card outputs enabled
6 RSVD R Reserved. Bit 6 returns 0b when read.
5 AUTOPWRSWEN RW
Auto power switch enable.
0 = Automatic socket power switching based on card detects is disabled
1 = Automatic socket power switching based on card detects is enabled
4 CAPWREN RW
PC Card power enable.
0 = V
CC
= No connection
1 = V
CC
is enabled and controlled by bit 2 (EXCAPOWER) of the system control register
(PCI offset 80h, see Section 4.29)
3−2 RSVD R Reserved. Bits 3 and 2 return 00b when read.
1−0 EXCAVPP RW
PC Card V
PP
power control. Bits 1 and 0 request changes to card V
PP
. The controller ignores this field
unless V
CC
to the socket is enabled. This field is encoded as:
00 = No connection (default)
01 = V
CC
10 = 12 V
11 = Reserved