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參數(shù)資料
| 型號(hào)： | AN1816 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)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 |
| 文件頁數(shù)： | 6/24頁 |
| 文件大小： | 332K |
| 代理商： | AN1816 |
AN1816
6
Application Note
control message. The short word response message encoding is shown
in
Figure 7 Short Word Response Message
.
The message consists of one 8-bit data byte and the calculated 4-bit
CRC.
Long words are always sent in response to long word commands and
short words are always sent in response to short word commands. When
the word format changes between successive commands, the first
response sent during the new format will be invalid since it will not have
the proper number of bits.
Error Checking
The master and slaves calculate a CRC on the information portion of their
received messages. The message is valid only if the calculated CRC
matches the CRC sent as part of the message. An error bit is set in the
master when it receives an invalid message. The slaves discard and ignore
all invalid received messages and in addition do not respond to them.
Slave Device
Addressing
Freescale Semiconductor, Inc.
Each slave device on the bus must be given a unique 4-bit address (from
1 (0001) to 15 (1111)) and assigned to one of four groups. Address 0
(0000) is used to address all 15 slave nodes at once.
Programmable
Devices
After system power up the master must set the address of all daisy chain
slave devices with programmable addresses before network
communications can commence. These devices have a bus switch on
the power/signal line. At power up the programmable device bus
switches are open and only close once an initialisation message has
been received.
With the first bus switch open, the bus only goes as far as the first slave.
When the master sends a slave initialisation command, the first slave
device stores its address information and closes its bus switch. The
second daisy chain slave is now connected to the network. When the
master initialises the second slave’s address, the first device responds
with an initialisation response message. The response message echoes
the programming information back to the master so that it knows that the
address was successfully established. Each slave sends the
initialisation response message only once after receiving a program
address command message.
DATA
CRC
D7
D6
D5
D4
D3
D2
D1
D0
X3
X2
X1
X0
Figure 7 Short Word Response Message
F
For More Information On This Product,
Go to: www.freescale.com
n
.
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