mitac 8355.pdf - tim.id.au

5.3 VT8235 South Bridge-8
Internal Keyboard Controller
Signal Name Pin # I/O PU Signal Description
MSCK /IRQ1 W2 IO/I PU MultiFunction Pin (Internal mouse controller enabled by
Rx51[1]) Rx51[1]=1 Mouse Clock. From internal mouse
controller. Rx51[1]=0 Interrupt Request 1 .Interrupt
input 1.
MSDT /IRQ12 W1 IO/I PU MultiFunction Pin (Internal mouse controller enabled by
Rx51[1]) Rx51[1]=1 Mouse Data. From internal mouse
controller. Rx51[1]=0 Interrupt Request 12. Interrupt
input 12.
KBCK /KA20G V3 IO /I PU MultiFunction Pin (Internal keyboard controller enabled
by Rx51[0]) Rx51[0]=1 Keyboard Clock. From internal
keyboard controller Rx51[0]=0 Gate A20.Input from
external keyboard controller.
KBDT /KBRC V2 IO/I PU MultiFunction Pin (Internal keyboard controller enabled
by
Rx51[0])
Rx51[0]=1 Keyboard Data. From internal keyboard
controller.
Rx51[0]=0 Keyboard Reset. From external keyboard
controller (KBC)for CPURST# generation
KBCS#/ROMCS#/srap AF12 O/O Keyboard Chip Select (Rx51[0]=0).To external
keyboard controller chip. Strap high o enable LPC ROM:
Note: KBCK,KBDT,MSCK,and MSDT are powered by the VSUS33 suspend voltage plane.
AC97 Audio /Modem Interface
Signal Name Pin # I/O Signal Description
ACRST# R3 O AC97 Reset.
ACBTCK T3 I AC97 Bit Clock.
ACSYNC T1 O AC97 Sync.
ACSDO U1 O AC97 Serial Data Out.
ACSDIN0 (VSUS33) T2 I AC97 Serial Data In 0.
ACSDIN1 (VSUS33) U3 I AC97 Serial Data In 1.
ACSDIN2 /GPIO20 /PCS0# U2 I AC97 Serial Data In2.RxE4[6]=0,E5[1]=0,PMIO
Rx4C[20]=1
ACSDIN3/GPIO21
V1 I AC97 Serial Data In 3.RxE4[6]=0,E5[2]=0,PMIO
/PCS1#/SLPBTN#
Rx4C[21]=1
The supply voltage for ACSDIN0-1 is VSUS33 so these inputs can support wake-up on modem ring
8355 N/B MAINTENANCE
Power and Ground
Signal Name Pin # I/O Signal Description
VCC33 (see pin list)v P I/O Power.3.3V ±5%
VCC (see pin list) P Core Power.2.5V ±5%.This supply is turned on only when he
mechanical switch on the power supply is turned on and he
PWRON signal is conditioned high .
Note: The VT8235L core voltage is 2.5V so board designs that
are intended t all w use of either VT8235 or VT8235L should
take this difference into account and allow the core voltage to
be selected as either 2.5V (for the VT8235)or 3.3V (for the
VT8235L).
GND (see pin list) P Ground. Connect o primary motherboard ground plane.
VSUS33 AA4,AB4,
AC4,AC5
P Suspend Power.3.3V ±5%.Always available unless the
mechanical switch of the power supply is turned off. If the
“soft-off”state is not implemented, then this pin can be
Connected to VCC33.Signals powered by or referenced o this
plane are:PWRGD, RSMRST#,PWRBTN#,SMBCK1/2,
SMBDT1/2,GPO0,SUSA#/GPO1,SUSB#/ GPO2,SUSC#,
SUSST1#/GPO3,SUSCLK /GPO4,GPI1,GPI2/EXTSMI#,GPI3
/RING#,GPI4 /LID,GPI5 /BATLOW#,GPI6 /PME#,
SMBALRT#
VSUS25 T4,U4 P Suspend Power.2.5V ±5%.
VSUSUSB D15 P USB Suspend Power.2.5V ±5%.
VBAT AE4 P RTC Battery. Battery input for internal RTC
(RTCX1,RTCX2)
VLVREF J23 P V-Link Voltage Reference.0.9V ±5%.0.34 xVCC25to0.38
xVCC25.
VCCVK (see pin list) P V-Link Compensation Circuit Voltage.2.5V ±5%
MIIVCC D11,D12,
E11,E12
P LAN MII Power.3.3V ±5%.Power for LAN Media
Independent Interface (interface to external PHY).Connect o
VCC33 through a ferrite bead.
MIIVCC25 D13,E13 P LAN MII Suspend Power.2.5V ±5%.
RAMVCC E7 P LAN RAM Power.2.5V ±5%.Power for LAN internal RAM.
Connect to VCC through a ferrite bead.
RAMGND E8 P LAN RAM Ground. Connect o GND through a ferrite bead.
USBVCC (see pin list) P USB 2.0 Differential Output Power.3.3V ±5%.Power for
USB differential outputs (USBP0+,P0 –,P1+,P1 –,P2+,
P2 –, P3+, P3 –,P4+,P4 –,P5+,P5 –).Connect o VSUS33
through a ferrite bead.
USBGND (see pin list) P USB 2.0 Differential Output Ground. Connect to GND
through a ferrite bead.
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