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RC7106
PRODUCT SPECIFICATION
4
Pin Descriptions
Pin Name
CPU0:2
Pin Number
40,38,37
Type
OUT
Pin Function Description
CPU Clock Outputs: The frequency of these three CPU clocks are
determined by the 4 select pins FS0:3 or via the I
2
C interface.
CPU/2 Clock Output: The frequency of this clock is determined by
the 4 select pins FS0:3 or via the I
2
C interface.
PCI BUS Clock Outputs: These seven PCI clock outputs run
synchronously to the CPU.
I/O Dual Function FS0 and PCI_F pin: See table for frequency
selection. After power-on, this pin becomes a free-running PCI
clock.
I/O Dual Function FS1:3 and PCI1:3 pin: See table for frequency
selection. After power-on, these pins become normal PCI clock.
3V66 Clock Outputs: See table for frequency selection
REF Clock Output: This output provides a 14.318MHz high drive
clock .
I/O Dual Function SEL24_48# and REF1 Pin: During power-up, if
the input is “0”, 48MHz would be selected on pin 26. If the input is
latched “1”, 24MHz would be selected. After power-on, this pin
becomes a REF1 output. There is an internal pull-up resistor on this
pin.
IOAPIC Clock Outputs: See table for frequency selection.
I/O Dual Function 24_48MHz and Freq_APIC pin: See table for
frequency selection. After power-on the pin becomes a normal
24MHz or 48MHz clock depending on pin 3 during power-up.
I/O Dual Function 48MHz and FS3 pin: See table for frequency
selection. After power-on the pin becomes a normal 48MHz clock.
Crystal Connection: An input connection for an external14.318MHz
crystal. Connect to either a 14.318MHz crystal or other reference
signal.
Crystal Connection: If using an external reference, this pin must be
left unconnected.
Power-down Input pin: This pin shuts down the clock PLL bring all
clocks to a low state.
I
2
C Clock Pin: The I
2
C clock should be applied to this input as
described in the I
2
C section of this datasheet.
I
2
C Data Pin: Data should be presented to this input as described
by the I
2
C section of this datasheet. There is an internal pull-up
resistor on this pin.
3.3V Power Pins:
CPU/2
42
OUT
PCI4:10
14,15,17,18,
20,21,22
8
OUT
FS0/PCI_F
IN/OUT
FS1:3/
PCI1:3
3V66-0:2
REF0
9,11,12
IN/OUT
34,33,32
1
OUT
OUT
SEL24_48#/
REF1
3
IN/OUT
IOAPIC0:2
24_48MHz/
FREQ_APIC
47,46,44
26
OUT
OUT/IN
48MHz/
SEL_3V66
X1
27
OUT/IN
5
IN
X2
6
OUT
PWRDWN#
24
IN
SCLK
29
IN
SDATA
30
IN/OUT
VDD
4,10,16,23,
28,35
39,43,48
1,7,13,19,25,
31,36,41,45
POWER
VDDL
VSS
POWER
POWER
2.5V Power Pins:
Ground Pins: