13.18 Power Management Capabilities Register

The power management capabilities register indicates the capabilities of the Smart Card controller related to PCI power management. See Table 13−11 for a complete description of the register contents.

Bit

15

 

14

13

 

12

11

10

9

8

7

6

5

4

3

2

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Name

 

 

 

 

 

 

 

 

Power management capabilities

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type

RU

 

R

R

 

R

R

R

R

R

R

R

R

R

R

R

R

R

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Default

0

 

1

1

 

1

1

1

1

0

0

0

0

0

0

0

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Register:

Power management capabilities

 

 

 

 

 

 

 

 

 

Offset:

 

46h

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type:

 

Read/Update, Read-only

 

 

 

 

 

 

 

 

 

 

 

Default:

 

7E02h

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 13−11. Power Management Capabilities Register Description

BIT

FIELD NAME

TYPE

 

 

 

 

DESCRIPTION

 

 

 

 

 

 

 

 

 

15

PME_D3COLD

RU

 

 

 

 

support from D3cold. This bit can be set to 1 or cleared to 0 via bit 4 (D3_COLD) in the general

 

PME

 

 

 

 

 

control register at offset 4Ch in the PCI configuration space (see Section 13.22). When this bit is set

 

 

 

to 1, it indicates that the controller is capable of generating a PME wake event from D3cold. This bit state

 

 

 

 

is dependent upon the PCI7x21/PCI7x11 VAUX implementation and may be configured by using bit 4

 

 

 

 

(D3_COLD) in the general control register (see Section 13.22).

 

 

 

 

 

 

 

 

14

PME_D3HOT

R

 

 

 

 

support. This 4-bit field indicates the power states from which the Smart Card interface may

 

PME

 

 

 

 

 

assert PME. This field returns a value of 1111b by default, indicating that

PME

may be asserted from

13

PME_D2

R

 

 

the D3hot, D2, D1, and D0 power states.

 

 

 

 

12

PME_D1

R

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11

PME_D0

R

 

 

 

 

 

 

 

 

 

 

 

 

 

10

D2_SUPPORT

R

 

D2 support. Bit 10 is hardwired to 1, indicating that the Smart Card controller supports the D2 power

 

 

 

 

state.

 

 

 

 

 

 

9

D1_SUPPORT

R

 

D1 support. Bit 9 is hardwired to 1, indicating that the Smart Card controller supports the D1 power

 

 

 

 

state.

 

 

 

 

 

 

8−6

AUX_CURRENT

R

 

Auxiliary current. This 3-bit field reports the 3.3-VAUXauxiliary current requirements. When bit 15

 

 

 

 

(PME_D3COLD) is cleared, this field returns 000b; otherwise, it returns 001b.

 

 

 

 

000b = Self-powered

 

 

 

 

001b = 55 mA (3.3-VAUXmaximum current required)

5

DSI

R

 

Device-specific initialization. This function requires device-specific initialization.

 

 

 

 

 

 

4

RSVD

R

 

Reserved. Bit 4 returns 0 when read.

 

 

 

 

 

3

PME_CLK

R

 

 

 

 

clock. This bit returns 0 when read, indicating that the PCI clock is not required for the Smart Card

 

PME

 

 

 

 

controller to generate PME.

 

 

 

 

 

2−0

PM_VERSION

R

 

Power-management version. This field returns 010b when read, indicating that the Smart Card

 

 

 

 

controller is compatible with the registers described in the PCI Bus Power Management Interface

 

 

 

 

Specification (Revision 1.1).

 

 

 

 

 

 

 

 

 

 

13−11

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Texas Instruments PCI7421 11. Power Management Capabilities Register Description, PMED3HOT, PMED2, PMED1 PMED0 D2SUPPORT