CY28RS480
Document #: 38-07638 Rev. *C
Page 2 of 15
Pin Description
Pin No.
Name
Type
Description
41,40,45,44
CPUT/C
O, DIF Differential CPU clock outputs. AMD K8 buffer (200 Mhz).
50
PCI0
O
33-MHz clock output.
37
IREF
I
A precision resistor attached to this pin is connected to the internal current
reference.
52, 53, 54
REF[2:0]
O, SE 14.318-MHz REF clock output. Intel Type-5 buffer.
7SCLK
I,PU
SMBus-compatible SCLOCK.This pin has an internal pull-up, but is tri-stated in
power-down.
8
SDATA
I/O,PU SMBus-compatible SDATA.This pin has an internal pull-up, but is tri-stated in
power-down.
27, 28, 30, 29
SRCST/C[1:0]
O, DIF Differentials Selectable serial reference clock. Intel Type-X buffer.
Includes overclock support through SMBUS
12, 13, 16,
17, 18, 19,
22, 23, 24,
25, 34, 33
SRCT/C[5:0]
O, DIF 100-MHz differential serial reference clock. Intel Type-X buffer.
10,11
CLKREQ#[0:1]
I, SE,
PD
Output Enable control for SRCT/C. Output enable control required by Minicard
specification. This pin has an internal pull-down.
0 = Selected SRC outputs are enabled, 1 = Selected SRC outputs are disabled
4
USB_48
O, SE 48-MHz clock output. Intel Type-3A buffer.
47
HTT66
O, SE 66-MHz clock output. Intel Type-5 buffer.
3
VDD_48
PWR 3.3V power supply for USB outputs
43
VDD_CPU
PWR 3.3V power supply for CPU outputs
51
VDD_PCI
PWR 3.3V power supply for PCI outputs
56
VDD_REF
PWR 3.3V power supply for REF outputs
48
VDD_HTT
PWR 3.3V power supply for Hyper Transport outputs
14, 21
VDD_SRC
PWR 3.3V power supply for SRC outputs
35
VDD_SRC1
PWR 3.3V power supply for SRC outputs
32
VDD_SRCS
PWR 3.3V power supply for SRCS outputs
39
VDDA
PWR 3.3V Analog Power for PLLs
5
VSS_48
GND Ground for USB outputs
42
VSS_CPU
GND Ground for CPU outputs
49
VSS_PCI
GND Ground for PCI outputs
55
VSS_REF
GND Ground for REF outputs
15, 20, 26
VSS_SRC
GND Ground for SRC outputs
36
VSS_SRC1
GND Ground for SRC outputs
31
VSS_SRCS
GND Ground for SRCS outputs
46
VSS_HTT
GND Ground for HyperTransport outputs
38
VSSA
GND Analog Ground
1
XIN
I
14.318-MHz Crystal Input
2
XOUT
O
14.318-MHz Crystal Output
6, 9
NC
No Connects
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