欢迎访问ic37.com |
会员登录 免费注册
发布采购

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 ]
 浏览型号CY28349B的Datasheet PDF文件第1页浏览型号CY28349B的Datasheet PDF文件第2页浏览型号CY28349B的Datasheet PDF文件第3页浏览型号CY28349B的Datasheet PDF文件第4页浏览型号CY28349B的Datasheet PDF文件第6页浏览型号CY28349B的Datasheet PDF文件第7页浏览型号CY28349B的Datasheet PDF文件第8页浏览型号CY28349B的Datasheet PDF文件第9页  
CY28349B  
Data Protocol  
Serial Data Interface  
The clock driver serial protocol accepts Byte Write, byte read,  
Block Write and Block Read operation 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. For Byte Write and Byte Read operations,  
the system controller can access individual indexed bytes. The  
offset of the indexed byte is encoded in the command code,  
as described in Table 1.  
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, etc. can be individually enabled or  
disabled.  
The register associated with the Serial Data Interface  
initializes to its 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 Block Write and Block Read protocol is outlined in Table 2  
while Table 3 outlines the corresponding byte write and byte  
read protocol.  
The slave receiver address is 11010010 (D2h).  
Table 1. Command Code Definition  
Bit  
Descriptions  
0 = Block Read or Block Write operation  
1 = Byte Read or Byte Write operation  
7
Byte offset for Byte Read or Byte Write operation. For Block Read or Block Write operations,  
these bits should be ‘0000000’.  
6:0  
Table 2. Block Read and Block Write Protocol  
Block Write Protocol  
Block Read Protocol  
Description  
Bit  
1
Description  
Bit  
1
Start  
Start  
2:8  
9
Slave address – 7 bits  
Write  
2:8  
9
Slave address – 7 bits  
Write  
10  
Acknowledge from slave  
10  
Acknowledge from slave  
Command Code – 8 bits  
‘00000000’ stands for block operation  
Command Code – 8 bits  
‘00000000’ stands for block operation  
11:18  
11:18  
19  
20:27  
28  
Acknowledge from slave  
Byte Count – 8 bits  
19  
20  
Acknowledge from slave  
Repeat start  
Acknowledge from slave  
Data byte 0 – 8 bits  
21:27  
28  
Slave address – 7 bits  
Read  
29:36  
37  
Acknowledge from slave  
Data byte 1 – 8 bits  
29  
Acknowledge from slave  
Byte count from slave – 8 bits  
Acknowledge  
38:45  
46  
30:37  
38  
Acknowledge from slave  
Data Byte N/Slave Acknowledge...  
Data Byte N – 8 bits  
Acknowledge from slave  
Stop  
...  
39:46  
47  
Data byte from slave – 8 bits  
Acknowledge  
...  
...  
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  
Table 3. Byte Read and Byte Write Protocol  
Byte Write Protocol  
Byte Read Protocol  
Description  
Bit  
1
Description  
Bit  
1
Start  
Slave address – 7 bits  
Start  
2:8  
2:8  
Slave address – 7 bits  
Rev 1.0,November 20, 2006  
Page 5 of 20  
 复制成功!