Datasheet

5−7
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.
Bit 7 6 5 4 3 2 1 0
Name ExCA power control
Type RW R R RW RW R RW RW
Default 0 0 0 0 0 0 0 0
Register: ExCA power control
Offset: CardBus socket address + 802h; Card A ExCA offset 02h
Card B ExCA offset 42h
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 PCI1520. 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 0 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 0s when read.
1−0 EXCAVPP RW
PC Card V
PP
power control. Bits 1 and 0 are used to request changes to card V
PP
. The PCI1520 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
Table 5−5. ExCA Power Control Register Description—82365SL-DF 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 PCI1520. This bit is encoded as:
0 = 16-bit PC Card outputs disabled (default)
1 = 16-bit PC Card outputs enabled
6−5 RSVD R Reserved. Bits 6 and 5 return 0s when read.
4−3 EXCAVCC RW
V
CC
. Bits 4 and 3 are used to request changes to card V
CC
. This field is encoded as:
00 = 0 V (default)
01 = 0 V reserved
10 = 5 V
11 = 3.3 V
2 RSVD R Reserved. Bit 2 returns 0 when read.
1−0 EXCAVPP RW
V
PP
. Bits 1 and 0 are used to request changes to card V
PP
. The PCI1520 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