參數(shù)資料
型號(hào): MD8412B
廠商: Electronic Theatre Controls, Inc.
英文描述: LINK(IEEE 1394)
中文描述: 鏈接(1394)
文件頁數(shù): 72/114頁
文件大小: 577K
代理商: MD8412B
MD8412B
60
FUJIFUILM MICRODEVICES CO., LTD.
Ver 1.10
5-2-3
Request
As a request to access a register of the PHY-chip or a PHY-LINK bus, MD8412B sends a short serial stream to the LREC
terminal. The stream involves information about the type requested, speed of the packet transferred, and the reading/writ-
ing command.
Figure 5-2-3 LREQ Stream
5-2-3-1
LREQ
A request for PHY-LINK bus is placed in LREQ by a format with the length of 7 bits as shown in Table 5-2-3.
A request for PHY-chip register read-out is placed in LREQ by a format with the length of 9 bits as shown in Table 5-2-
5. A request for PHY-chip register writing is placed in LREQ by a format with the length of 17 bits as shown in Table 5-2-
6.
Bit(s)
Type
Contents
0
Start Bit
Showing the start of transfer. "1"is always transferred.
1~3
Request Type
Indicating a requested type as specified in Table 5-2-6.
4~5
Request Speed
Indicating the transfer speed of the requesting PHY-chip.
6
Stop Bit
Showing the end of transfer. "0" is always transferred.
Table 5-2-3 Request Format
LREQ[4:5]
Data Rate
00
100Mbps
01
200Mbps
10
400Mbps
11
>400Mbps
Table 5-2-4 Speed Format
LR0
LR1
LR2
LR3
LR4
LR
n-1
LR
n
LRn = LREQn
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