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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 17/43頁 |
| 文件大小： | 285K |
| 代理商： | SBPH400-3 |
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SBPH400-3
17/43
2.8.4 Link device request (LREQ)
The link layer device requests the bus or accesses a register in the SBPH400 by sending a
short serial stream on the
LREQ
pin. The information sent includes the type of bus request,
the speed at which the packet is to be sent, or a read or write command. The length of the
request stream depends on whether it is a bus request (8 bits), a read register request (9 bits),
a write register request (17 bits), or an accelerate control request (6 bits).
The request stream always commences with a start bit (value 1b) and terminates with a stop
bit (0b). Bit 0 is transmitted first on the serial request stream.
The LREQ timing and the definition of the bits in the transfer are shown in Figure 2.10
Figure 2.10
LREQ timing
The
Bus Request
is 8 bits long and is specified in Table 2.7. (Note that this is backwards
compatible with the 7-bit format as specified in IEEE 1394-1995, which is also supported by
the SBPH400.)
The
Read Request
is used to read a register in the device. It is 9 bits long and is specified in
Table 2.8.
Table 2.7
Bus request format
Bit(s)
0
1-3
Name
Start_Bit
Request_Type
Description
Indicates start of transfer. Always 1.
Indicates the type of bus request being performed. See Table 2.12 for the
encoding of this field.
Indicates the speed at which the SBPH400 will be sending the packet for
this request. This fieldhas the same encoding asthe speed code fromthe
first symbol of the receive packet. See Table 2.11 for the encoding of this
field.
Indicates end of transfer. Always 0.
4-6
Request_Speed
7
Stop_Bit
Table 2.8
Read register request format
Bit(s)
0
1-3
4-7
8
Name
Start_Bit
Request_Type
Address
Stop_Bit
Description
Indicates the start of transfer. Always 1.
100b (Register read)
Indicates the address of the physical register to be read.
Indicates end of transfer. Always 0.
LR0
LR1
LR2
LR3
LR(n-2)
LR(n-1)
2
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