power on sequence signal.pdf

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PSON# Hi
ATX
TOP VIEW
+5
+5
-5
+ 12
5VSB
PWOK
5VSB to 3VSB
Linear Reg.
5VSB
1
Cap./
Res.
PWRBTN
3VSB
1/0
1
PANNEL
GND GND
GND + 5
0
GND GND
PSON + 5
GND GND
- 12V + 3V
+ 3V
+ 3V
ASIC
IT8282
PSON Pull low circuit
PWRBTN
0
PSON
0
Super I/O
South
Bridge
98
ASUS Confidential
PSON# Low
+5
+5
-5
+ 12
5VSB
PWOK
CPU SOCKET
(2)
GND GND
GND + 5
GND GND
PSON + 5
GND GND
- 12V + 3V
+ 3V
+ 3V
CPURST
(5)
PG1
IDERST
Circuit
PWROK
(3)
(4)
PCIRST
IDE SLOT
North Bridge
PCI SLOT
Circuit
PSON
(1)
PANNEL
PWRBTN
South Bridge
99
ASUS Confidential
Power On Sequence with Reset (P5GD1 Sample)
CPURST#
(10)
GMCH
PWROK
(7)
PLTRST#
(8)
User press
Ctrl+Alt+Del
User press
Power button
Power
PSON
(6)
PLTRST#
(9)
PWRBTN#
(3)
PWRBTN#_SB
Super IO
IDE
RSMRST# IO_PWRBTN#
SLP_S3# SLP_S4#
PWROK
(2)
(4)
(5)
(7)
(5)
PCIRST#
(8)
ICH6
PCI
User Clear
CMOS
RTCRST#
(1)
CPU
CPUPWRG
D
GB L
Lan
FWH
1394
100
PLTRST#
( )
(8)
PCI-EX16
PLTRST#
(9)
1. When +5VSB is good, SIO send out RSMRST#.
2. When RSTCON#_SIO is sent, SIO send
,
PWRGD/PWROK to notice SB.
3. When SLP_S3# is sent by SB, SIO will drive PSON#
High, then Power Supply will cut off main power.
PCI-EX1
ASUS Confidential
RAID
Power On Sequence (P5Q3 Sample)
101
ASUS Confidential
Power On Sequence (P6T Sample)
102
ASUS Confidential

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