參數(shù)資料
型號(hào)： AN1816
廠商： 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述： USING THE HC912B32 TO IMPLEMENT THE DISTRIBUTED SYSTEMS INTERFACE (DSI) PROTOCOL
中文描述： 使用本HC912B32為實(shí)施分布式系統(tǒng)接口（DSI）協(xié)議
文件頁(yè)數(shù)： 5/24頁(yè)
文件大?。?/td> 332K
代理商： AN1816
AN1816
5
Distributed Systems Interface (DSI) Overview
Command and
Control Messages
The long word command and control message encoding is shown in
Figure 4 Long Word Command and Control Message
.
The message consists of 8 bits of data, the encoded 4-bit address of the
intended slave device, a 4-bit encoded command, and the calculated
4-bit CRC.
The short word command and control message encoding is shown in
Figure 5 Short Word Command and Control Message
.
The message consists of the encoded 4-bit address of the intended
slave device, a 4-bit encoded command, and the calculated 4-bit CRC.
Response
Messages
A long word response message is sent from the slave to the master in
response to a long word command and control message to the slave’s
address. The response is transmitted during the next command and
control message. The long word response message encoding is shown
in
Figure 6 Long Word Response Message
.
The message consists of two 8-bit data bytes and the calculated 4-bit
CRC
A short word response message is sent from the slave to the master in
response to a short word command and control message to the slave’s
address. The response is transmitted during the next command and
DATA
ADDRESS
COMMAND
CRC
D7
D6
D5
D4
D3
D2
D1
D0
A3
A2
A1
A0
C3
C2
C1
C0
X3
X2
X1
X0
Figure 4 Long Word Command and Control Message
ADDRESS
COMMAND
CRC
A3
A2
A1
A0
C3
C2
C1
C0
X3
X2
X1
X0
Figure 5 Short Word Command and Control Message
DATA BYTE 1
DATA BYTE 2
CRC
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
X3
X2
X1
X0
Figure 6 Long Word Response Message
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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