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SBPH400-3 датащи(PDF) 18 Page - STMicroelectronics

номер детали SBPH400-3
подробное описание детали  IEEE1394 3-Port 400Mbps Physical Layer
PDF  43 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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SBPH400-3 датащи(HTML) 18 Page - STMicroelectronics

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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.
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
The Request Speed field in the bus request is encoded as specified in Table 2.11:
Table 2.9
Write register request format
Bit(s)
Name
Description
0
Start_Bit
Indicates the start of transfer. Always 1.
1-3
Request_Type
101b (Register write)
4-7
Address
Indicates the address of the physical register to be written.
8-15
Data
Indicates the data to be written to the specified physical register.
16
Stop_Bit
Indicates end of transfer. Always 0.
Table 2.10
Accelerate control request format
Bit(s)
Name
Description
0
Start_Bit
Indicates the start of transfer. Always 1.
1-3
Request_Type
110b (AccCtrl)
4
Acceleration_Select
0 = Decelerate
1 = Accelerate
5
Stop_Bit
Indicates end of transfer. Always 0.
Table 2.11
Request speed field
LR[4:6]
Data Rate
000
S100
001
not supported (S1600)
010
S200
011
not supported (S3200)
100
S400
101
reserved
110
not supported (S800)
111
reserved
2



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