
Smart Card Controller Programming Model
238
September 2005
SCPS110
13.19 Power-Management Control and Status Register
The power-management control and status register implements the control and status of the Smart Card
controller. This register is not affected by the internally-generated reset caused by the transition from the D3hot
to D0 state. See Table 1312 for a complete description of the register contents.
Function 4 register offset: 48h
Register type:
Read/Clear/Update, 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 1312. Power-Management Control and Status Register Description
BIT
FIELD NAME
TYPE
DESCRIPTION
15
PME_STAT
RCU
PME status. This bit is set when the function would normally assert the PME signal independent of the
state of PME_EN bit. Writing a 1b to this bit clears it and causes the function to stop asserting a PME
(if enabled). Writing a 0b has no effect. This bit is initialized by GRST only when the PME_D3cold bit
is 1b.
149
RSVD
R
Reserved. Bits 149 return 00 0000b when read.
8
PME_EN
RW
PME enable. This bit is initialized by GRST only when PME_D3cold bit is 1b.
72
RSVD
R
Reserved. Bits 72 return 00 0000b when read.
10
DSTATE
RW
Device state: This bit field controls device power-management state. Invalid state assignments are
ignored. (ex. Current state 10b
→ writing 01b. This is rejected and stays 10b. See the latest PCI Local
Bus Specification.) This bit field is initialized by GRST only when PME_D3cold bit is 1b.
One or more bits in this register are cleared only by the assertion of GRST.
13.20 Power-Management Bridge Support Extension Register
The power-management bridge support extension register provides extended power-management features
not applicable to the Smart Card controller; thus, it is read-only and returns 00h when read.
Function 4 register offset: 4Ah
Register type:
Read-only
Default value:
00h
BIT NUMBER
7
6
5
4
3
2
1
0
RESET STATE
0
13.21 Power-Management Data Register
The power-management bridge support extension register provides extended power-management features
not applicable to the Smart Card controller; thus, it is read-only and returns 0 when read.
Function 4 register offset: 4Bh
Register type:
Read-only
Default value:
00h
BIT NUMBER
7
6
5
4
3
2
1
0
RESET STATE
0