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8355 N/B MAINTENANCE
8355 N/B MAINTENANCE
114
System Management Bus (SMB)Interface (I 2 CBus)
Signal Name Pin # I/O Signal Description
SMBCK1 AB3 IO SMB /I
2
C Channel 1 Clock.
SMBCK2
/GPI27/GPO27
AE1 IO SMB /I
2
C Channel 2 Clock.Rx95[2]=0
SMBDT1 AC2 IO SMB /I
2
C Channel 1 Data.
SMBDT2
/GPI26/GPO26
AD1 IO SMB /I
3
C Channel 2 Data.Rx95[2]=0
SMBALRT# AB2 I SMB Alert.(enabled by System Management Bus I/O space
Rx08[1]When the chip is enabled to allow it, assertion
generates an IRQ SMI interrupt or a power management resume
event. Connect o a ohm pull up to VSUS33 if not used.
Power and Ground Continue
Signal Name Pin # I/O Signal Description
VCCUPLL A23,D22 P
USB 2.0 PLL Analog Voltage.2.5V
±5%.Connect to VCC
through a ferrite bead.
GNDU
PLL
B23,E22 P USB 2.0 PLL Analog Ground. Connect to GND through a
ferrite bead.
PLLVCC P22 P
PLL Analog Power.2.5V
±5%.Connect to VCC through a
ferrite bead.
PLLGND P23 P PLL Analog Ground. Connect o GND through a ferrite bead.
ISA Subset /Parallel BIOS ROM Interface
Signal Name Pin # I/O PU Signal Description
ROMCS#/KBCS#/
strap
AF12 O ROM Chip Select (Rx51[0]=1).Chip Select o the BIOS
ROM. Strap high to enable LPCROM.
SPKR /srap AE9 O Speaker. Strap low to enable (high o disable)CPU
frequency strapping.
MEMR# AE12 O
Memory Read.
MEMW# AF10 O
Memory Write.
IOR# AC10 O
I/O Read.
IOW# AD9 O
I/O Write.
IORDY /GPI19 AD10 I I/O Ready. Used to insert wait states in I/O or memory
cycles. RxE5[0]=0
SOE#/s rap AD12 O XD Bus Tranceiver Output Enable. Strap low to enable
auto reboot.
XD[7-0] AD13,AE
13,
AF13,AD
14,
AE14,AF
14,
AC13,AC
14
IO XD Bus. For input of BIOS ROM data or data from to
her on-board I/O or memory devices.
SA[19-16]/GPO[19
-16]
/sraps
AC11,AD
11,
AE11,AF
11
O PD System Address 19-16.Strap states are passed to North
Bridge via VAD[3-0].Functions as SA[19-16]if
RxE4[5]=0.
SA[15-0]/SDD[15-
0]
(see pin
lis )
O System Address 15-0.
5.3 VT8235 South Bridge-9