W83194R-630/-630A
5.3
I
2
C Control Interface
SYMBOL
PIN
I/O
FUNCTION
*SDATA
*SDCLK
23
24
I/O
IN
Serial data of I
2
C 2-wire control interface
Serial clock of I
2
C 2-wire control interface
5.4 Fixed Frequency Outputs
SYMBOL
PIN
I/O
FUNCTION
3.3V, 14.318MHz reference clock output .
REF0X2 / *FS3
2
I/O
Internal 250kΩ pull-up.
Latched input for FS3 at initial power up for H/W
selecting the output frequency of CPU, SDRAM and
PCI clocks.
3.3V , 14.318MHz reference clock output.
SEL2.5_3.3# controls the Vdd of CPU. If logic 0 at
power on, VddLCPU=3.3V. If logic 1, VddLCPU=2.5
24MHz or 48MHz selected by I2C for Super I/O.
Internal 250kΩ pull-up.
48MHz / *FS0
26
I/O
Latched input for FS0 at initial power up for H/W
selecting the output frequency of CPU, SDRAM and
PCI clocks. 48MHz output for USB during normal
operation.
REF1
24_48MHz/
SEL2.5_3.3#
48
25
I/O
I/O
5.5 Power Pins
SYMBOL
PIN
FUNCTION
Vdd
VddLCPU
VddP
VddSD
Vss
1
47
6,15
19,27,30,36,42
Power supply for REF crystal and core logic.
Power supply for CPUCLK_F and CPUCLK[0:1], either
2.5V or 3.3V.
Power supply for PCI outputs.
Power supply for SDRAM and 48/24NHz outputs.
3,10,16,22,33,39,44 Circuit Ground.
-6-
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