PCI1221 datasheet(109/123 Pages) TI

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socket control register

Bit

Name

Socket control

Type

Default

Bit

Name

Socket control

Type

R/W

Default

Socket control

Type:

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

Offset:

CardBus socket address + 10h

Default:

0000 0000h

Description: The socket control register provides control of the voltages applied to the socket and

instructions for CB CLKRUN protocol. The PCI1221 ensures that the socket is powered up

only at acceptable voltages when a CardBus card is inserted. See Table 57 for a complete

description of the register contents.

Table 57. Socket Control Register

BIT

SIGNAL

TYPE

FUNCTION

31–8

RSVD

Reserved. Bits 31–8 are read only and return 0s when read.

STOPCLK

R/W

CB CLKRUN protocol instructions.

0 = CB CLKRUN protocol can only attempt to stop/slow the CB clock if the socket is idle and

the PCI CLKRUN protocol is preparing to stop/slow the PCI bus clock.

1 = CB CLKRUN protocol can attempt to stop/slow the CB clock if the socket is idle.

6-4

VCCCTRL

R/W

VCC control. Bits 6-4 are used to request card VCC changes.

000 = Request power off (default)

001 = Reserved

010 = Request VCC = 5 V

011 = Request VCC = 3.3 V

100 = Request VCC = X.X V

101 = Request VCC = Y.Y V

110 = Reserved

111 = Reserved

RSVD

Reserved. Bit 3 is read only and returns 0 when read.

2-0

VPPCTRL

R/W

VPP control. Bits 2-0 are used to request card VPP changes.

000 = Request power off (default)

001 = Request VPP = 12 V

010 = Request VPP = 5 V

011 = Request VPP = 3.3 V

100 = Request VPP = X.X V

101 = Request VPP = Y.Y V

110 = Reserved

111 = Reserved

PCI1221 Datasheet(PDF) 109 Page - Texas Instruments

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