SBPH400-3 查看數據表（PDF） - STMicroelectronics
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SBPH400-3 Datasheet PDF : 43 Pages
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SBPH400-3
The Write Request is used to write to a register in the device. It is 17 bits long and is specified
in Table 2.9.
Table 2.9 Write register request format
Bit(s)
0
1-3
4-7
8-15
16
Name
Start_Bit
Request_Type
Address
Data
Stop_Bit
Description
Indicates the start of transfer. Always 1.
101b (Register write)
Indicates the address of the physical register to be written.
Indicates the data to be written to the specified physical register.
Indicates end of transfer. Always 0.
The Accelerate Control Request is used to control the use of arbitration acceleration in order
to prevent Cycle Start packet starvation. It is 6 bits long and is specified in Table 2.10
Table 2.10 Accelerate control request format
Bit(s)
0
1-3
4
5
Name
Start_Bit
Request_Type
Acceleration_Select
Stop_Bit
Description
Indicates the start of transfer. Always 1.
110b (AccCtrl)
0 = Decelerate
1 = Accelerate
Indicates end of transfer. Always 0.
The Request Speed field in the bus request is encoded as specified in Table 2.11:
Table 2.11 Request speed field
LR[4:6]
000
001
010
011
100
101
110
111
Data Rate
S100
not supported (S1600)
S200
not supported (S3200)
S400
reserved
not supported (S800)
reserved
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