DM562P
V.90 Integrated Data/ Fax/Voice/Speakerphone
Modem Device Single Chip with Memory Built in
Power Management Control/Status(Xxxxxx54h~PMCSR)
PMCSR
Offset=54H
R/W
R/W
0
0
0
0
0
0
9
0
0
0
0
0
0
2
R/W
15 14
8
7
1
0
Bit
Default
Type
Description
31:16
0000h
RO
Reserved
PME_Status
15
0
R/C
_WR
This bit is set when the function would normally assert the PME# signal
independent of the state of the PME_En bit. Writing a “1” to this bit will
clear it.
This bit defaults to “0” if the function does not support PME# generation
from D3(cold).
If the function supports PME# from D3(cold) then this bit is sticky and
must be explicitly cleared by the operating system each time the
operating system is initially loaded.
14:9
8
000000
0
RO
Reserved.
It means that the DM6588 does not support reporting power
consumption.
PME_En
RW
_WR
Write “1” to enables the function to assert PME#, write “0” to disable
PME# assertion.
This bit defaults to “0” if the function does not support PME# generation
from D3(cold).
If the function supports PME# from D3(cold) then this bit is sticky and
must be explicitly cleared by the operating system each time the
operating system is initially loaded.
7:2
1:0
000000
00
RO
Reserved
RW
_WR
_RD
Power State.
This two bits field is both used to determine the current power state of a
function and to set the function into a new power state. The definitionis
given below.
00 : D0
11 : D3(hot)
PME_Status bit , Ring Detect ,and Ring to PME
PCI function power management state
circuit.
The DM6588 supports PCI function power states D0,
D3(hot), D3(cold). Additional PCI signal PME# to pin
A19 of the standard PCI connector.
PCI MODEM Power Management Operation
During a true power-on situation (no auxiliary and
normal power), PME_En = 0 to avoid to assert PME#.
When assert RST#, the pci configuration space is set
to default value except PME context which must
preserve.
PME Context
PME (power Management Event) context is defined
as the functional state information and logic required
to generate power management events(PMEs),
report PME status, and enable PMEs.
For MODEM, PME context consists of PME_En bit,
32
Final
Version: DM562P-DS-F01
February 02, 2004
DAVICOM [ DAVICOM SEMICONDUCTOR, INC. ]
