VT82C686B Resets And Clocks - ETC-unknow

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VT82C686B

Manufacturer Part Number
VT82C686B
Description
Manufacturer
ETC-unknow
Datasheet
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Signal Name
PWRGD
PCIRST#
RSTDRV
BCLK
OSC
RTCX1
RTCX2
SLOWCLK / GPO0
Signal Name
VCC
GND
VCCS
VBAT
VREF
VCCH
GNDH
VCCU
GNDU
Revision 1.71 June 9, 2000
7HFKQRORJLHV ,QF
F7, F10, F12-F14,
F6, F11, F15, G6,
K12, L6, L9-L12,
H6, H15, J6, J15,
R7-R8, R11, R14
G15, J9-J12, K9-
P6, P15, R6, R15
M15, N6, N15,
L15, M9-M12,
K6, K15, M6,
R9-R10
Pin #
Pin #
B16
T13
R12
R13
W6
W5
H5
Y5
Y6
E4
T8
F9
F8
J1
I/O
I/O
O
O
O
O
O
P
P
P
P
P
P
P
P
P
I
I
I
Signal Description
Power Good. Connected to the PWRGOOD signal on the Power Supply.
PCI Reset. Active low reset signal for the PCI bus. The VT82C686B will
assert this pin during power-up or from the control register.
Reset Drive. Reset signal to the ISA bus. Connect through an inverter to the
chipset north bridge RESET# input and to PCI bus RESET#.
Bus Clock. ISA bus clock.
Oscillator. 14.31818 MHz clock signal used by the internal Timer.
Slow Clock. .Frequency selectable if PMU function 4 Rx54[1-0] is nonzero
(set to 01, 10, or 11).
Signal Description
Core Power. 3.3V nominal (3.15V to 3.45V). This supply is turned on only
when the mechanical switch on the power supply is turned on and the
PWRON signal is conditioned high. This pin should be connected to the
same voltage as the CPU I/O circuitry. Internally connected to hardware
monitoring system voltage detection circuitry for 3.3V monitoring.
Ground. Connect to primary motherboard ground plane.
Suspend Power. 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 VCC. Signals powered by or referenced to this plane are:
PWRGD, RSMRST#, PWRBTN#, SMBCLK, SMBDATA, SUSCLK,
SUSA# / GPO1, SUSB# / GPO2, SUSC#, SUSST1# / GPO6, GPI1 / IRQ8#,
GPI2 / BATLOW#, GPI3 / LID, GPI5 / PME#, GPI6 / SMBALRT#, GPI7 /
RING#, GPO0
RTC Battery. Battery input for internal RTC (RTCX1, RTCX2)
Voltage Reference (5V 5%). For thermal sensing and 5V input tolerance.
Hardware Monitor Power.
(voltage monitoring, temperature monitoring, and fan speed monitoring).
Connect to VCC through a ferrite bead.
Hardware Monitor Ground. Connect to GND through a ferrite bead.
USB Differential Output Power.
(USBP0+, P0-, P1+, P1-, P2+, P2-, P3+, P3-). Connect to VCC through a
ferrite bead.
USB Differential Output Ground. Connect to GND through a ferrite bead.
RTC Crystal Input: 32.768 KHz crystal or oscillator input. This input is
RTC Crystal Output: 32.768 KHz crystal output
Power and Ground

Resets and Clocks

used for the internal RTC and for power-well power management logic.
-26-
Power for hardware monitoring subsystem
Power for USB differential outputs
VT82C686B
Pinouts

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