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C9812DYB 参数 Datasheet PDF下载

C9812DYB图片预览
型号: C9812DYB
PDF下载: 下载PDF文件 查看货源
内容描述: 低EMI时钟发生器为Intel 810E芯片组的系统 [Low EMI Clock Generator for Intel 810E Chipset Systems]
分类和应用: 时钟发生器
文件页数/大小: 18 页 / 270 K
品牌: CYPRESS [ CYPRESS ]
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APPROVED PRODUCT  
C9812  
Low EMI Clock Generator for Intel 810E Chipset Systems  
Serial Control Registers  
NOTE: The Pin# column lists the affected pin number where applicable. The @Pup column gives the state at true  
power up. Bytes are set to the values shown only on true power up.  
Following the acknowledge of the Address Byte, two additional bytes must be sent:  
1) “Command Code “ byte, and  
2) “Byte Count” byte.  
Although the data (bits) in these two bytes are considered “don’t care”; they must be sent and will be acknowledged.  
After the Command Code and the Count bytes have been acknowledged, the below described sequence (Byte 0, Byte 1,  
and Byte2) will be valid and acknowledged.  
Byte 0: CPU Clock Register (1=Enable, 0=Disable, Default=07)  
Byte 1: SDRAM Clock Register (1=Enable, 0=Disable, Default=FF)  
Bit  
7
6
5
4
3
2
1
0
@Pup  
Pin#  
-
-
-
-
Description  
Reserved  
Reserved  
Reserved  
Reserved  
Spread spectrum mode  
DOT  
Bit  
7
6
5
4
3
2
1
0
@Pup  
Pin#  
36  
37  
39  
40  
42  
43  
45  
46  
Description  
SDRAM7  
SDRAM6  
SDRAM5  
SDRAM4  
SDRAM3  
SDRAM2  
SDRAM1  
SDRAM0  
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
-
26  
25  
49  
USB  
CPU2_ITP  
Byte 2: PCI Clock Register (1=Enable, 0=Disable, Default=FE)  
Byte 3: Reserved Register (Default=00)  
Byte 4: Reserved Register (Default=00)  
Byte 5: SSCG Control Register (Default=00)  
Bit  
7
@Pup  
Pin#  
20  
19  
18  
16  
15  
13  
12  
-
Description  
PCI7  
1
1
1
1
1
1
1
0
6
PCI6  
5
PCI5  
4
PCI4  
Bit  
7
@Pup  
Pin#  
Description  
Spread Mode (0=down, 1=center)  
Ref. Table 4  
Ref. Table 4  
Reserved  
3
PCI3  
0
0
0
0
0
0
0
0
-
-
-
-
-
-
-
-
2
PCI2  
6
5
4
1
PCI1  
0
Reserved  
3
Reserved  
2
Reserved  
1
Reserved  
0
Reserved  
Cypress Semiconductor Corporation  
525 Los Coches St.  
Document#: 38-07053 Rev. **  
05/03/01  
Milpitas, CA 95035. Tel: 408-263-6300, Fax: 408-263-6571  
http://www.cypress.com  
Page 7 of 18  
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