DM562P
V.90 Integrated Data/ Fax/Voice/Speakerphone
Modem Device Single Chip with Memory Built in
DM6588 can not assert PME# from D0. But can
Assert PME# from D3(hot) and D3(cold). Hence the
Ring to PME# circuit must check the power state. If
ring comes at D0 power state, it can not assert
PME#.
When host detect PME# asserted, it will power up
PCI bus and assert RST# to initialize pci modem. At
the same time, it write 1 into PME_En bit or
PME_Status bit to stop PME#.
Before enter D3(hot) state, host must :
5. Write 1 into PME_Status bit to clear previous
PME status
Software will enable its use by setting the PME_En
bit in the PMCSR.
It must continue to assert PME# until software either
clears the PME_En bit or clears the PME_Status bit.
Before enter D3(cold) state, host must :
1. Write 1 into PME_Status bit to clear previous
PME status
6. Write 1 into PME_En bit to enable PME
function.
7. Write 3 into Power_state
When Ring come, Ring to PME# circuit check if
PME_EN=1 and Power_staus <>0. If yes, assert
PME# and set PME_Status=1.
When host detect PME# asserted, it will re-initialize
pci modem and set Power_State=0 to return D0 state.
At the same time, it write 1 into PME_En bit or
PME_Status bit to stop PME#.
2. Write 1 into PME_En bit to enable PME
function.
3. Write 3 into Power_state
4. Power off PCI bus.
When Ring comes, Ring to PME# circuit check if
PME_EN=1 and Power_staus <>0. If yes, assert
PME# and set PME_Status=1.
PCI MODEM Board Power Management
VDD
VDD
Vsb
VDD : PCI +3.3V power
Vsb : auxilily +3.3V power
Power
Switch
Power on/off
VCC_AUX
VCC = VDD if poweron
VCC = floating if power off
Ring
30.24MHz
Detector
SCLK
DM6580
DIT
RxIN
TxA1
TxA2
VCC_AUX
PCI to ISA
RI to PME#
DOT
TFS
DIR
PCI Bus
TX DSP
Line
DAA
DOR
Analog
DM6588A
RFS
Front End
Speaker
Driver
Micro Control
Unit
SPKR
TXSCLK*2
RXSCLK
CLKIN
RX DSP
TXDCLK
Microphone
Driver
RXDCLK
Final
33
Version: DM562P-DS-F01
February 02, 2004
DAVICOM [ DAVICOM SEMICONDUCTOR, INC. ]
