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CY28346ZC-2 参数 Datasheet PDF下载

CY28346ZC-2图片预览
型号: CY28346ZC-2
PDF下载: 下载PDF文件 查看货源
内容描述: 时钟合成器,差分CPU输出 [Clock Synthesizer with Differential CPU Outputs]
分类和应用: 晶体外围集成电路光电二极管时钟
文件页数/大小: 19 页 / 169 K
品牌: SPECTRALINEAR [ SPECTRALINEAR INC ]
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CY28346-2  
Byte 7: Watchdog Time Stamp Register  
Bit  
7
@Pup  
Name  
Description  
0
0
0
0
0
0
0
0
Reserved  
Reserved  
Reserved  
Reserved  
Reserved  
Reserved  
Reserved  
Reserved  
6
5
4
3
2
1
0
Byte 8: Dial-a-Frequency Control Register N (all bits are read and write functional)  
Bit  
7
@Pup  
Name  
Description  
0
0
0
0
0
0
0
0
N7, MSB  
N6  
6
5
N5  
4
N4  
3
N3  
2
N2  
1
N3  
0
N0, LSB  
Byte 9: Dial-a-Frequency Control Register R (all bits are read and write functional)  
Bit  
7
@Pup  
Name  
Description  
0
0
0
0
0
0
0
0
R6 MSB  
R5  
6
5
R4  
4
R3  
3
R2  
2
R1  
1
R0, LSB  
0
R and N register load gate 0 = gate closed (data is latched), 1 = gate open  
(data is loading from SMBus registers into R and N)  
Dial-a-Frequency Feature  
Dial-a-dB Features  
SMBus Dial-a-Frequency feature is available in this device via  
Byte8 and Byte9. See our App Note AN-0025 for details on our  
Dial-a-Frequency feature.  
SMBus Dial-a-dB feature is available in this device via Byte8  
and Byte9.  
Spread Spectrum Clock Generation (SSCG)  
P is a large value PLL constant that depends on the frequency  
selection achieved through the hardware selectors (S1, S0).  
P value may be determined from Table 3.  
Spread Spectrum is a modulation technique used to  
minimizing EMI radiation generated by repetitive digital  
signals. A clock presents the greatest EMI energy at the center  
frequency it is generating. Spread Spectrum distributes this  
energy over a specific and controlled frequency bandwidth  
therefore causing the average energy at any one point in this  
band to decrease in value. This technique is achieved by  
modulating the clock away from its resting frequency by a  
certain percentage (which also determines the amount of EMI  
reduction). In this device, Spread Spectrum is enabled by  
setting specific register bits in the SMBus control Bytes.  
Table 4 is a listing of the modes and percentages of Spread  
Spectrum modulation that this device incorporates.  
Table 3. P Value  
S(1:0)  
0 0  
P
32005333  
48008000  
96016000  
64010667  
0 1  
1 0  
1 1  
Rev 1.0,November 20, 2006  
Page 6 of 19  
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