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參數(shù)資料
| 型號： | AN1816 |
| 廠商： | 飛思卡爾半導體(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為實施分布式系統(tǒng)接口（DSI）協(xié)議 |
| 文件頁數(shù)： | 9/24頁 |
| 文件大?。?/td> | 332K |
| 代理商： | AN1816 |
AN1816
9
HARDWARE DESIGN
The MC33790 Bus Transceiver is an analogue SmartMOS device,
which serves as the physical interface to the two-wire DSI bus. It uses a
combination of pulse length encoded voltage levels for transmit data to
slave nodes and current return signals for receive data at the same time.
Figure 9 MC68HC55 frame and output signals with respect to MC33790 DSIx0 signal
When the MC33790 receives data for transmission to the slave nodes
from the MC68HC55, its bus transmitter circuit converts the 0 to 5 volt
inputs from the MC68HC55’s DSIxF (frame) and DSIxS (signal) to a
voltage level on the output DSIxO which connects to BUS_IN of the first
slave node. The value output on DSIxO of the MC33790 depends on the
values of DSIxF and DSIxS as shown in
Table 1 DSIxO Truth Table
.
See also
Figure 9 MC68HC55 frame and output signals with respect to
MC33790 DSIx0 signal
.
When the MC33790 is receiving data from the slave nodes, it samples
the current responses on the rising edge of the final third of bit time. The
current response is then compared against a reference point, which
determines whether a low or high has been returned.
DSIxF (frame)
from MC68HC55
DSIxS (signal)
from MC68HC55
DSIxO
from MC33790
Idle
Idle
High
Low
DSIxF
DSIxS
DSIxR
DSIxO
0
0
Return Data
Low (1.5V)
0
1
Return Data
High (4.5V)
1
0
0
High Impedance
1
1
0
Idle
Table 1 DSIxO Truth Table
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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