MiTAC 8355 service manual VT8235 South Bridge-9, Power and Ground Continue

8355 N/B MAINTENANCE

5.3 VT8235 South Bridge-9

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	B23,E22	P	USB 2.0 PLL Analog Ground. Connect to GND through a
PLL			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#/		AF12		O		ROM Chip Select (Rx51[0]=1).Chip Select o the BIOS
strap						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		IO		XD Bus. For input of BIOS ROM data or data from to
	13,					her on-board I/O or memory devices.
		AF13,AD
	14,
		AE14,AF
	14,
		AC13,AC
	14
SA[19-16]/GPO[19		AC11,AD		O	PD	System Address 19-16.Strap states are passed to North
-16]	11,					Bridge via VAD[3-0].Functions as SA[19-16]if
/sraps		AE11,AF				RxE4[5]=0.
	11
SA[15-0]/SDD[15-		(see	pin	O		System Address 15-0.
0]		lis )

System Management Bus (SMB)Interface (I 2 CBus)

Signal Name	Pin #	I/O	Signal Description
SMBCK1	AB3	IO	SMB /I2 C Channel 1 Clock.
SMBCK2	AE1	IO	SMB /I2 C Channel 2 Clock.Rx95[2]=0
/GPI27/GPO27
SMBDT1	AC2	IO	SMB /I2C Channel 1 Data.
SMBDT2	AD1	IO	SMB /I3C Channel 2 Data.Rx95[2]=0
/GPI26/GPO26
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.

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