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W83792AG 参数 Datasheet PDF下载

W83792AG图片预览
型号: W83792AG
PDF下载: 下载PDF文件 查看货源
内容描述: H / W监测IC (公务员事务局版) [H/W Monitoring IC (CSB Version)]
分类和应用: 模拟IC信号电路监控
文件页数/大小: 97 页 / 1032 K
品牌: WINBOND [ WINBOND ]
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W83792AD/AG/D/G  
(b) Serial bus read from a register  
0
7
8
0
7
8
SCL  
SDA  
0
1
0
1
1
0
1
R/W  
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
Start By  
Master  
Ack  
by  
792D  
Ack  
by  
792D  
Frame 1  
Serial Bus Address Byte  
Frame 2  
Internal Index Register Byte  
0
8
0
0
7
0
7
8
1
0
1
1
0
1
R/W  
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
Nak  
Ack  
by  
792D  
Stop by  
Master  
by  
Frame 3  
Serial Bus Address Byte  
Repeat  
Frame 4  
Data Byte  
Master  
start  
by  
Master  
0
Figure 2. Serial Bus Read from Internal Address Register  
7.4 Address Resolution Protocol (ARP) Introduction  
As the W8792D/G is a slave device existing on the System Management Bus, it must have a unique  
address to prevent itself from conflicting with the other devices existing on the same bus. In order to  
solve the problem of address conflicts, SMBus version 2.0 introduces the concept of dynamically  
assigned address called Address Resolution Protocol (ARP). By such mechanism, each device  
existing on the SMBus will be given with an unique slave address if it is a ARP-capable device. Thus,  
to meet the new spec, W83792D/G uniquely provides ARP compliant function to acquire an unique  
slave address.  
The typical process of ARP contains several steps, including Prepare to ARP, Reset Device, Get  
UDID, Assign Address, and so on. Whenever the slave device accepts the command of ARP master,  
it must reply an Acknowledgement to the ARP master, thus the ARP master is able to carry on the  
next step. In order to provide a mechanism to isolate device for the purpose of address assignment,  
each device must implement a unique device identifier (UDID). The UDID is a 128-bit number  
comprised of several field, including Device Capabilities, Version Revision, Vendor ID, Device ID,  
Interface, Subsystem Vendor ID, Subsystem Device ID, and Vendor Specific ID. After the UDID of the  
device is sent to the ARP master, the ARP master will then assign an address not in the Used  
Address Pool to the device.  
Generally speaking, there are eleven possible commands to read /write the data of SMBus device,  
and a slave device may use any or all of the eleven protocols to communicate. These protocols are  
Quick Command, Send Byte, Receive Byte, Write Byte, Write Word, Read Byte, Read word, Process  
Call, Block Write, and Block Write-Block Read Process Call. W83792D/G itself supports the Block  
Write-Block Read Process with PEC to communicate with ARP Master. Following is a description of  
the SMBus packet protocol diagrams element key. Not all protocol elements will be present in every  
command, that is, not all packets are required to include the Packet Error Code.  
Publication Release Date: April 26, 2006  
- 13 -  
Revision 0.9