CY28323PVC

Rev 1.0, November 24, 2006

Page 2 of 21

Pin Definitions

Pin Name

Pin No.

Pin

Type

Pin Description

X1

3

I

Crystal Connection or External Reference Frequency Input: This pin has dual

functions. It can be used as an external 14.318-MHz crystal connection or as an

external reference frequency input.

X2

4

O

Crystal Connection: Connection for an external 14.318-MHz crystal. If using an

external reference, this pin must be left unconnected.

REF0/MULTSEL0

48

I/O

Reference Clock 0/Current Multiplier Selection 0: 3.3V 14.318-MHz clock

output. This pin also serves as a power-on strap option to determine the current

multiplier for the CPU clock outputs. The MULTSEL1:0 definitions are as follows:

MULTSEL1:0

00 = Ioh is 4 x IREF

01 = Ioh is 5 x IREF

10 = Ioh is 6 x IREF

11 = Ioh is 7 x IREF

REF1/MULTSEL1

1

I/O

Reference Clock 1/Current Multiplier Selection 1: 3.3V 14.318-MHz clock

output. This pin also serves as a power-on strap option to determine the current

multiplier for the CPU clock outputs. The MULTSEL1:0 definitions are as follows:

MULTSEL1:0

00 = Ioh is 4 x IREF

01 = Ioh is 5 x IREF

10 = Ioh is 6 x IREF

11 = Ioh is 7 x IREF

CPU0:1, CPU0:1#

41, 38, 40,

37

O

CPU Clock Outputs: Frequency is set by the FS0:4 inputs or through serial input

interface.

CPU_ITP,

CPU_ITP#

44, 45

I/O

CPU Clock Output for ITP: Frequency is set by the FS0:4 inputs or through

serial input interface.

3V66_0:3

31, 30, 28,

27

O

66-MHz Clock Outputs: 3.3V fixed 66-MHz clock.

PCI_F0/FS2

6

I/O

Free-running PCI Output 0/Frequency Select 2: 3.3V free-running PCI output.

This pin also serves as a power-on strap option to determine device operating

frequency as described in the Frequency Selection Table.

PCI_F1/FS3

7

I/O

Free-running PCI Output 1/Frequency Select 3: 3.3V free-running PCI output.

This pin also serves as a power-on strap option to determine device operating

frequency as described in the

Table 4.

PCI_F2

8

I/O

Free-running PCI Output 2: 3.3V free-running PCI output.

PCI0/FS4

10

I/O

PCI Output 0/Frequency Select 4: 3.3V PCI output. This pin also serves as a

power-on strap option to determine device operating frequency as described in

Table 4.

PCI1:6

11, 12, 14,

15, 16, 17

O

PCI Clock Output 1 to 6: 3.3V PCI clock outputs.

48MHz/FS0

22

I/O

48-MHz Output/Frequency Select 0: 3.3V fixed 48-MHz, non-spread spectrum

output. This pin also serves as a power-on strap option to determine device

operating frequency as described in

Table 4.

This output will be used as the reference clock for USB host controller in Intel 845

(Brookdale) platforms. For Intel Brookdale - G platforms, this output will be used

as the VCH reference clock.

24_48MHz/FS1

23

I/O

24- or 48-MHz Output/Frequency Select 1: 3.3V fixed 24-MHz or 48-MHz

non-spread spectrum output. This pin also serves as a power-on strap option to

determine device operating frequency as described in

Table 4.

This output will be used as the reference clock for SIO devices in Intel 845

(Brookdale) platforms. For Intel Brookdale - G platforms, this output will be used

as the reference clock for both USB host controller and SIO devices. We

recommend system designer to configure this output as 48 MHz and “HIGH

Drive” by setting Byte [5], Bit [0] and Byte [9], Bit [7], respectively.