PCI1221 datasheet(86/123 Pages) TI

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ExCA power-control register (index 02h)

Bit

Name

ExCA power control

Type

R/W

Default

ExCA power control

Type:

Read only, read/write (see individual bit descriptions)

Offset:

CardBus socket address + 802h; Card A ExCA offset 02h

Card B ExCA offset 42h

Default:

00h

Description: This register provides PC Card power control. Bit 7 of this register controls the 16-bit outputs

on the socket interface, and can be used for power management in 16-bit PC Card

applications. See Table 41 for a complete description of the register contents.

Table 41. ExCA Power-Control Register (Index 02h)

BIT

SIGNAL

TYPE

FUNCTION

COE

R/W

Card output enable. Bit 7 controls the state of all of the 16-bit outputs on the PCI1221. 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 6–5 are read only and return 0s when read. Write transactions have no effect.

4-3

EXCAVCC

R/W

VCC. Bits 4-3 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 V

RSVD

Reserved. Bit 2 is read only and returns 0 when read. Write transactions have no effect.

1-0

EXCAVPP

R/W

VPP. Bits 1-0 are used to request changes to card VPP. The PCI1221 ignores this field unless VCC to the

socket is enabled (i.e., 5 V or 3.3 V). This field is encoded as:

00 = 0 V (default)

01 = VCC

10 = 12 V

11 = 0 V reserved

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