19 power management control and status register – Texas Instruments Dual/Single Socket CardBus and UntraMedia Controller PCI7621 User Manual
Page 284
13−12
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 D3
hot
to D0 state. See
Table 13−12 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 control and status
Type
RCU
R
R
R
R
R
R
RW
R
R
R
R
R
R
RW
RW
Default
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Register:
Power management control and status
Offset:
48h
Type:
Read/Clear/Update, Read/Write, Read-only
Default:
0000h
Table 13−12. 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 1 to this bit clears it and causes the function to stop asserting a PME
(if enabled). Writing a 0 has no effect. This bit is initialized by GRST only when the PME_D3cold bit
is 1.
14−9
RSVD
R
Reserved. Bits 14−9 return 0s when read.
8 ‡
PME_EN
RW
PME enable. This bit is initialized by GRST only when PME_D3cold bit is 1.
7−2
RSVD
R
Reserved. Bits 7−2 return 0s when read.
1−0 ‡
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 1.
‡ 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 0 when read.
Bit
7
6
5
4
3
2
1
0
Name
Power management bridge support extension
Type
R
R
R
R
R
R
R
R
Default
0
0
0
0
0
0
0
0
Register:
Power management bridge support extension
Offset:
4Ah
Type:
Read-only
Default:
00h