參數(shù)資料
型號(hào)： SBPH400-3
廠商： 意法半導(dǎo)體
英文描述： IEEE1394 3-Port 400Mbps Physical Layer
中文描述： IEEE1394連接3端口400Mbps的物理層
文件頁(yè)數(shù)： 18/43頁(yè)
文件大小： 285K
代理商： SBPH400-3
18/43
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)
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.
Table 2.10
Accelerate control request format
Bit(s)
0
1-3
4
Name
Start_Bit
Request_Type
Acceleration_Select
Description
Indicates the start of transfer. Always 1.
110b (AccCtrl)
0 = Decelerate
1 = Accelerate
Indicates end of transfer. Always 0.
5
Stop_Bit
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
2
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