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CY28323PVC
... Document #: 38-07004 Rev. *B Page Page 3 of 21 of 21
PWR_DWN#
42
I
Power Down Control: 3.3V LVTTL-compatible input that places the device in
power-down mode when held LOW.
SCLK
26
I
SMBus Clock Input: Clock pin for serial interface.
SDATA
25
I/O
SMBus Data Input: Data pin for serial interface.
RST#
20
O
(open-
drain)
System Reset Output: Open-drain system reset output.
IREF
35
I
Current Reference for CPU Output: A precision resistor is attached to this pin
which is connected to the internal current reference.
VTT_PWRGD#
19
I
Powergood from Voltage Regulator Module (VRM): 3.3V LVTTL input.
VTT_PWRGD# is a level-sensitive strobe used to determine when FS0:4 and
MULTSEL0:1 inputs are valid and OK to be sampled (Active LOW). Once
VTT_PWRGD# is sampled LOW, the status of this input will be ignored.
VDD_REF,
VDD _PCI,
VDD_48MHz,
VDD_3V66,
VDD_CPU
2, 9, 18, 24,
32, 39, 46
P
3.3V Power Connection: Power supply for CPU outputs buffers, 3V66 output
buffers, PCI output buffers, reference output buffers and 48-MHz output buffers.
Connect to 3.3V.
GND_PCI,
GND_48MHz,
GND_3V66,
GND_CPU,
GND_REF,
5, 13, 21, 29,
36, 43, 47
G
Ground Connection: Connect all ground pins to the common system ground
plane.
VDD_CORE
34
P
3.3V Analog Power Connection: Power supply for core logic, PLL circuitry.
Connect to 3.3V.
GND_CORE
33
G
Analog Ground Connection: Ground for core logic, PLL circuitry.
Pin Definitions (continued)
Pin Name
Pin No.
Pin
Type
Pin Description
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