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W144

更新时间: 2024-11-04 22:14:55
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赛普拉斯 - CYPRESS /
页数 文件大小 规格书
14页 158K
描述
440BX AGPset Spread Spectrum Frequency Synthesizer

W144 数据手册

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PRELIMINARY  
W144  
440BX AGPset Spread Spectrum  
Frequency Synthesizer  
Table 1. Mode Input Table  
Features  
• Maximized EMI suppression using Cypress’s Spread  
Spectrum technology  
• Single chip system frequency synthesizer for Intel  
440BX AGPset  
Mode  
Pin2  
0
1
PCI_STOP#  
REF0  
®
• Two copies of CPU output  
• Six copies of PCI output  
• One 48-MHz output for USB  
• One 24-MHz output for SIO  
• Two buffered reference outputs  
• One IOAPIC output  
Table 2. Pin Selectable Frequency  
Input Address  
CPU_F, CPU1  
FS3 FS2 FS1 FS0  
(MHz)  
PCI_F, 1:5 (MHz)  
33.3 (CPU/4)  
31 (CPU/4)  
37.5 (CPU/4)  
35 (CPU/4)  
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
133.3  
124  
150  
140  
105  
110  
115  
120  
100  
133.3  
112  
103  
66.8  
83.3  
75  
• Thirteen SDRAM outputs provide support for 3 DIMMs  
• Supports frequencies up to 150 MHz  
2
35 (CPU/3)  
• I C™ interface for programming  
36.7 (CPU/3)  
38.3 (CPU/3)  
40 (CPU/3)  
• Power management control inputs  
Key Specifications  
33.3 (CPU/3)  
44.43 (CPU/3)  
37.3 (CPU/3)  
34.3 (CPU/3)  
33.4 (CPU/2)  
41.7 (CPU/2)  
37.5 (CPU/2)  
41.3 (CPU/3)  
CPU Cycle-to-Cycle Jitter: ......................................... 250 ps  
CPU to CPU Output Skew: ........................................ 175 ps  
PCI to PCI Output Skew: ............................................ 500 ps  
V
V
: .................................................................... 3.3V±5%  
: .................................................................... 2.5V±5%  
DDQ3  
DDQ2  
SDRAMIN to SDRAM0:11 Delay: ..........................3.7 ns typ.  
SDRAM0:11 (leads) to SDRAM_F Skew: ..............0.4 ns typ.  
124  
Logic Block Diagram  
Pin Configuration  
VDDQ3  
VDDQ3  
REF0/(PCI_STOP#)  
GND  
48  
47  
46  
45  
44  
43  
42  
41  
40  
39  
38  
37  
36  
35  
34  
33  
32  
31  
30  
29  
28  
27  
26  
25  
VDDQ2  
1
REF0/(PCI_STOP#)  
REF1/FS2  
IOAPIC  
2
3
REF1/FS2*  
X1  
X2  
XTAL  
OSC  
X1  
GND  
4
PLL Ref Freq  
X2  
5
CPU_F  
VDDQ2  
IOAPIC  
VDDQ3  
PCI_F/MODE  
PCI1/FS3  
GND  
6
CPU1  
VDDQ2  
Stop  
Clock  
I/O Pin  
Control  
7
Control  
8
CLK_STOP#  
SDRAM_F  
GND  
SDRAM0  
SDRAM1  
VDDQ3  
SDRAM2  
SDRAM3  
GND  
SDRAM4  
SDRAM5  
VDDQ3  
SDRAM6  
SDRAM7  
VDDQ3  
48MHz/FS0*  
24MHz/FS1*  
9
CLK_STOP#  
PCI2  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
VDDQ2  
PCI3  
Stop  
Clock  
Control  
PCI4  
CPU1  
PCI5  
PLL 1  
÷2,3,4  
CPU_F  
VDDQ3  
SDRAMIN  
GND  
VDDQ3  
PCI_F/MODE  
SDRAM11  
SDRAM10  
VDDQ3  
SDRAM9  
SDRAM8  
GND  
PCI1/FS3  
PCI2  
Stop  
Clock  
PCI3  
Control  
PCI4  
PCI5  
2
SDATA  
SCLK  
I C  
Logic  
I2C  
{
SDATA  
SCLK  
VDDQ3  
48MHz/FS0  
PLL2  
Note:  
÷2  
1. Internal pull-up resistors should not be relied upon for setting  
I/O pins HGH. Pin function with parentheses determined by  
MODE pin resistor strapping. Unlike other I/O pins, input FS3  
has an internal pull down resistor.  
24MHz/FS1  
VDDQ3  
SDRAM0:11  
Stop  
Clock  
Control  
SDRAMIN  
12  
SDRAM_F  
Intel is a registered trademark of Intel Corporation. I2C is a trademark of Philips Corporation.  
Cypress Semiconductor Corporation  
3901 North First Street  
San Jose  
CA 95134  
408-943-2600  
November 2, 1999, rev. **  

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