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CY28349B 参数 Datasheet PDF下载

CY28349B图片预览
型号: CY28349B
PDF下载: 下载PDF文件 查看货源
内容描述: FTG的Intel㈢ Pentium㈢ 4的CPU和芯片组 [FTG for Intel㈢ Pentium㈢ 4 CPU and Chipsets]
分类和应用:
文件页数/大小: 20 页 / 222 K
品牌: SPECTRALINEAR [ SPECTRALINEAR INC ]
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CY28349B  
Pin Definitions  
Pin  
Type  
Pin Name  
Pin No.  
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  
44, 45  
O
CPU Clock Outputs: Frequency is set by the FS0:4 inputs or through serial input  
interface.  
CPU_ITP, CPU_ITP#  
I/O  
CPU Clock Output for ITP: Frequency is set by the FS0:4 inputs or through serial  
input interface.  
3V66_0:2  
31, 30, 28  
6
O
66-MHz Clock Outputs: 3.3V fixed 66-MHz clock.  
PCI_F0/FS2  
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 Table 4.  
PCI_F2  
8
I/O  
I/O  
Free-running PCI Output 2: 3.3V free-running PCI output.  
PCI0/FS4  
10  
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_0/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.  
3V66_3/48MHz_1  
27  
O
48-MHz or 66-MHz Output: 3.3V output.  
Rev 1.0,November 20, 2006  
Page 2 of 20  
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