
SD Host Controller Programming Model
225
September 2005
SCPS110
12.19 Power-Management Control and Status Register
The power-management control and status register implements the control and status of the SD host
controller. This register is not affected by the internally-generated reset caused by the transition from the D3hot
to D0 state. See Table 1214 for a complete description of the register contents.
Function 3 register offset: 84h
Register type:
Read/Clear, Read/Write, Read-only
Default value:
0000h
BIT NUMBER
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
RESET STATE
0
Table 1214. Power-Management Control and Status Register Description
BIT
FIELD NAME
TYPE
DESCRIPTION
15
PME_STAT
RCU
PME status. This bit defaults to 0b.
1413
DATA_SCALE
R
Data scale. This field returns 00b when read, because the SD host controller does not use the data
register.
129
DATA_SELECT
R
Data select. This field returns 0h when read, because the SD host controller does not use the data
register.
8
PME_EN
RW
PME enable. Enables PME signaling.
72
RSVD
R
Reserved. Bits 72 return 000000b when read.
10
PWR_STATE
RW
Power state. This 2-bit field determines the current power state and sets the SD host controller to a new
power state. This field is encoded as follows:
00 = Current power state is D0
01 = Current power state is D1
10 = Current power state is D2
11 = Current power state is D3hot
One or more bits in this register are cleared only by the assertion of GRST.
12.20 Power-Management Bridge Support Extension Register
The power-management bridge support extension register provides extended power-management features
not applicable to the SD host controller; thus, it is read-only and returns 00h when read.
Function 3 register offset: 86h
Register type:
Read-only
Default value:
00h
BIT NUMBER
7
6
5
4
3
2
1
0
RESET STATE
0
12.21 Power-Management Data Register
The power-management bridge support extension register provides extended power-management features
not applicable to the SD host controller; thus, it is read-only and returns 00h when read.
Function 3 register offset: 87h
Register type:
Read-only
Default value:
00h
BIT NUMBER
7
6
5
4
3
2
1
0
RESET STATE
0