PCI1520PDVG4 datasheet(102/140 Pages) TI

102 / 140 page

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

Name

ExCA power control

Type

Default

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

COE

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

RSVD

Reserved. Bit 6 returns 0 when read.

AUTOPWRSWEN

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.

CAPWREN

PC Card power enable.

0 = VCC = No connection

1 = VCC is enabled and controlled by bit 2 (EXCAPOWER) of the system control register

(PCI offset 80h, see Section 4.29).

3−2

RSVD

Reserved. Bits 3 and 2 return 0s when read.

1−0

EXCAVPP

PC Card VPP power control. Bits 1 and 0 are used to request changes to card VPP. The PCI1520 ignores

this field unless VCC to the socket is enabled. This field is encoded as:

00 = No connection (default)

01 = VCC

10 = 12 V

11 = Reserved

Table 5−5. ExCA Power Control Register Description—82365SL-DF Support

BIT

SIGNAL

TYPE

FUNCTION

COE

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

Reserved. Bits 6 and 5 return 0s when read.

4−3

EXCAVCC

VCC. Bits 4 and 3 are used to request changes to card VCC. This field is encoded as:

00 = 0 V (default)

01 = 0 V reserved

10 = 5 V

11 = 3.3 V

RSVD

Reserved. Bit 2 returns 0 when read.

1−0

EXCAVPP

VPP. Bits 1 and 0 are used to request changes to card VPP. The PCI1520 ignores this field unless VCC to

the socket is enabled. This field is encoded as:

00 = No connection (default)

01 = VCC

10 = 12 V

11 = Reserved

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