參數(shù)資料
型號(hào): 33793
廠商: Motorola, Inc.
英文描述: Distributed System Interface (DSI) Sensor Interface
中文描述: 分布式系統(tǒng)接口(DSI)傳感器接口
文件頁(yè)數(shù): 20/24頁(yè)
文件大?。?/td> 640K
代理商: 33793
33793
20
Go to: www.freescale.com
Set Logic Out Response
This response message is sent during the next message
following a valid Set Logic Out command to the addressed
device. The response is shown in
Table 21
. No response is
generated if the command address field was $0.
Reverse Initialization
The Reverse Initialization is similar to the Initialization
command and will only work under the condition that it has not
already been initialized. The command may be used three
ways. The first is to initialize a programmable address device.
The second is the first step in assigning a pre-programmed
address. The third is to initialize a pre-programmed device.
For the first case this command is sent to address zero with
the NV bit set to zero. The command will be received by the next
daisy chain device with its bus switch open. Reception of this
command will assign the device address and the group number.
Reception of this command will also cause the bus switch to
close if BS = 1 and no fault is detected.
For the second case the Initialization command is sent the
same as the first except that the NV bit is set to one. Reception
of the command will assign the device address and the group
number and cause the bus switch to close if BS = 1 and there
are no faults. A Read/Write NVM command then may be sent to
complete the setting of a pre-programmed address.
A pre-programmed device must be initialized by putting its
address in both PA3:PA0 and A3:A0 fields.
Once a device has received a reverse initialization
command, it will ignore further reverse initialization commands
or initialization commands unless it has received a Clear
command or undergone a power-up reset.
The command format is found in
Table 22
.
Table 21. Set Logic Out Response Format
High Byte
Low Byte
CRC
A3
A2
A1
A0
0
0
0
0
NV
U
LO
BS
IO3
IO2
IO1
IO0
X3
X2
X1
X0
Legend
A[3:0] - Address bits. The slave address.
BS = Bus Switch Position (1=closed)
IO[3:0] = Values at logic I/Os.
LO = Logic out driven level.
NV = Nonvolatile Memory Write. The value of the NV bit in the slave.
U = Undervoltage indicated true by a “1”.
X[3:0] = Cyclic Redundancy Check (CRC). The CRC as calculated by
the slave.
Table 22. Reverse Initialization Command Format
Data
Address
Command
CRC
NV
BS
G1
G0
PA3
PA2
PA1
PA0
A3
A2
A1
A0
1
1
1
1
X3
X2
X1
X0
Legend
A[3:0] = Address bits. These bits are the slave address. For
programmable devices these bits are all set to zero. For pre-
programmed devices these bits contain the pre-programmed
address and must match the PA[3:0] bits.
G[1:0] = Group bits. These bits are the group number for the
slave. These bits are not used by this device and should be
set to “0”.
PA[3:0] = Program Address bits. These bits are the address
that is to be stored into the slave’s address register.
NV = Nonvolatile Memory Write. When set to a one, this bit allows a
subsequent NVM command to store a nonvolatile address. When
set to a zero, NVM programming is disallowed. Once a permanent
address has been stored in the device, setting the NV bit to a one
has no effect.
X[3:0] = Cyclic Redundancy Check (CRC). The CRC as calculated
by the master.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
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