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參數(shù)資料
| 型號： | MC33793 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | Distributed System Interface (DSI) Sensor Interface(分布式系統(tǒng)接口（DSI）傳感器接口) |
| 中文描述： | 分布式系統(tǒng)接口（DSI）傳感器接口（分布式系統(tǒng)接口（DSI）的傳感器接口） |
| 文件頁數(shù)： | 12/24頁 |
| 文件大小： | 640K |
| 代理商： | MC33793 |
33793
12
Go to: www.freescale.com
OPERATION
A device may be permanently programmed one time with an
address using a two-command sequence. The first step is
satisfied on the reception of an Initialization command with
address set to zero, the PA[3:0] set to the address to be
programmed, and the NV bit set. This will cause the address
contained in the PA[3:0] bits to be stored in the address register
and the bus switch closed. The second step is taken when a
Read/Write NVM command is received with the PA[3:0] bits
matching the A[3:0] bits and also matching the bits stored in the
33793 address register. This will cause the 33793 to
permanently store this address into an internal NVM area.
Messages
The messages follow the format defined in the Distributed
Systems Interface Specification rev 1.0 unless otherwise noted.
DSI Bus Commands
This device can recognize and respond to both long-word
and short-word commands. A command word summary is
shown in
Table 1
. SW in the “Size” column of the table indicates
short-word commands and LW indicates long-word commands.
Short-word commands may also be sent in the long-word
format. However, when these commands are sent in the long-
word format, it is recommended that the data byte be sent as
$00 to maintain future compatibility. All commands marked
reserved should not be sent to 33793 slaves.
Table 1. DSI Bus Commands
Command
Size
Description
Data
C3
C2
C1
C0
D7
D6
D5
D4
D3
D2
D1
D0
0
0
0
0
LW
Initialization
NV
BS
G1
G0
PA3
PA2
PA1
PA0
0
0
0
1
SW
Request Status
–
–
–
–
–
–
–
–
0
0
1
0
SW
Request Value 0
–
–
–
–
–
–
–
–
0
0
1
1
LW
I/O Control
L3
L2
L1
L0
DR3
DR2
DR1
DR0
0
1
0
0
SW
Request ID Information
–
–
–
–
–
–
–
–
0
1
0
1
SW
Request Value 1
–
–
–
–
–
–
–
–
0
1
1
0
SW
Request Value 2
–
–
–
–
–
–
–
–
0
1
1
1
SW
Clear
–
–
–
–
–
–
–
–
1
0
0
0
SW
Request Value 3
–
–
–
–
–
–
–
–
1
0
0
1
LW
Read/Write NVM
1
1
1
1
PA3
PA2
PA1
PA0
1
0
1
0
Reserved
1
0
1
1
Reserved
1
1
0
0
SW
Clear Logic Out
–
–
–
–
–
–
–
–
1
1
0
1
SW
Set Logic Out
–
–
–
–
–
–
–
–
1
1
1
0
Reserved
1
1
1
1
LW
Reverse Initialization
NV
BS
G1
G0
PA3
PA2
PA1
PA0
Legend
BS = Controls closing of the Bus Switch (1 = close).
DR[3:0] = Direction of I/O. 1 = Output.
G[1:0] = Group assignment (the 33793 does not use these bits).
L[3:0] = Level to output on I/O if configured as outputs.
LO = Logic Out level.
PA[3:0] = Bus Address to set the device to.
NV = Allows nonvolatile address programming if set to "1".
F
Freescale Semiconductor, Inc.
For More Information On This Product,
n
.
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