6.6 Socket Power Management Register

This register provides power management control over the socket through a mechanism for slowing or stopping the clock on the card interface when the card is idle. See Table 6−7 for a complete description of the register contents.

Bit

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Name

 

 

 

 

 

 

Socket power management

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type

R

R

R

R

R

R

R

R

R

R

R

R

R

R

R

RW

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Default

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

Bit

15

 

14

13

12

11

10

9

 

8

7

 

6

 

5

4

 

3

 

2

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Name

 

 

 

 

 

 

 

 

Socket power management

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type

R

 

R

R

 

R

R

R

R

 

R

R

 

R

 

R

 

R

 

R

 

R

R

RW

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Default

0

 

0

0

0

0

0

0

 

0

0

 

0

 

0

0

 

0

 

0

0

0

 

 

Register:

Socket power management

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Offset:

 

CardBus Socket Address + 20h

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type:

 

Read-only, Read/Write

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Default:

 

0000 0000h

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 6−7. Socket Power Management Register Description

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BIT

 

SIGNAL

TYPE

 

 

 

 

 

 

 

 

FUNCTION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

31−26

 

RSVD

 

R

 

Reserved. These bits return 0s when read.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Socket access status. This bit provides information on whether a socket access has occurred. This bit is

25 ‡

 

SKTACCES

R

 

cleared by a read access.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

= No PC Card access has occurred (default).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

= PC Card has been accessed.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Socket mode status. This bit provides clock mode information.

 

 

 

 

 

 

 

 

 

24 ‡

 

SKTMODE

R

 

0 = Normal clock operation

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

= Clock frequency has changed.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

23−17

 

RSVD

 

R

 

These bits return 0s when read.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CardBus clock control enable. This bit, when set, enables clock control according to bit 0 (CLKCTRL).

16

 

CLKCTRLEN

RW

 

0 = Clock control disabled (default)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

= Clock control enabled

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15−1

 

RSVD

 

R

 

These bits return 0s when read.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CardBus clock control. This bit determines whether the CardBus

CLKRUN

protocol attempts to stop or

0

 

CLKCTRL

RW

 

slow the CardBus clock during idle states. The CLKCTRLEN bit enables this bit.

 

 

 

 

 

0

= Allows the CardBus CLKRUN protocol to attempt to stop the CardBus clock (default)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

= Allows the CardBus CLKRUN protocol to attempt to slow the CardBus clock by a factor of 16

This bit is cleared only by the assertion of GRST.

6−8

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Texas Instruments PCI7411, PCI7611, PCI7621, PCI7421 manual Socket Power Management Register, Socket power management