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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  
Pin Description (continued)  
Pin  
Name  
VSSIREF  
PWR  
I/O  
Description  
41  
26  
PWR Current reference programming input for CPU buffers. A resistor is  
connected between this pin and IREF. This pin should also be returned  
to device VSS.  
VDDA  
PWR Analog power input. Used for PLL and internal analog circuits. It is also  
specifically used to detect and determine when power is at an acceptable  
level to enable the device to operate.  
Serial Data Interface  
Data Protocol  
To enhance the flexibility and function of the clock synthesizer,  
a two-signal serial interface is provided. Through the Serial  
Data Interface, various device functions, such as individual  
clock output buffers, can be individually enabled or disabled.  
The registers associated with the Serial Data Interface  
initializes to their default setting upon power-up, and therefore  
use of this interface is optional. Clock device register changes  
are normally made upon system initialization, if any are  
required. The interface can also be used during system  
operation for power management functions.  
The clock driver serial protocol accepts block write and block  
read operations from the controller. For block write/read  
operation, the bytes must be accessed in sequential order  
from lowest to highest byte (most significant bit first) with the  
ability to stop after any complete byte has been transferred.  
The block write and block read protocol is outlined in Table 2.  
The slave receiver address is 11010010 (D2h).  
Table 2. Block Read and Block Write Protocol  
Block Write Protocol  
Block Read Protocol  
Bit  
1
Description  
Bit  
1
Description  
Start  
Start  
2:8  
9
Slave address – 7 bits  
Write = 0  
2:8  
9
Slave address – 7 bits  
Write = 0  
10  
Acknowledge from slave  
10  
Acknowledge from slave  
11:18  
Command Code – 8 bit  
‘00000000’ stands for block operation  
11:18  
Command Code – 8 bit  
‘00000000’ stands for block operation  
19  
20:27  
28  
Acknowledge from slave  
Byte Count – 8 bits  
Acknowledge from slave  
Data byte 1 – 8 bits  
Acknowledge from slave  
Data byte 2 – 8 bits  
Acknowledge from slave  
......................  
19  
20  
Acknowledge from slave  
Repeat start  
21:27  
28  
Slave address – 7 bits  
Read = 1  
29:36  
37  
29  
Acknowledge from slave  
Byte count from slave – 8 bits  
Acknowledge  
38:45  
46  
30:37  
38  
....  
39:46  
47  
Data byte from slave – 8 bits  
Acknowledge  
....  
Data Byte (N–1) –8 bits  
Acknowledge from slave  
Data Byte N –8 bits  
Acknowledge from slave  
Stop  
....  
48:55  
56  
Data byte from slave – 8 bits  
Acknowledge  
....  
....  
....  
Data bytes from slave/Acknowledge  
Data byte N from slave – 8 bits  
Not Acknowledge  
....  
....  
....  
....  
Stop  
Rev 1.0,November 20, 2006  
Page 3 of 19  
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