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| 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)： | 101/114頁 |
| 文件大?。?/td> | 577K |
| 代理商： | MD8412B |
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MD8412B
Ver 1.10
FUJIFUILM MICRODEVICES CO., LTD.
89
5-8
Asynchronous stream transfer flow
The MD8412B is provided with the various functions by which the asynchronous stream can be transferred. During trans-
mission or reception, the following controls are carried out.
5-8-1
Asynchronous stream transmission
During transmission, the asynchronous stream packet is sent to the ATF buffer as shown in the table below. At that time,
1Quadlet of the identification data, which is the asynchronous stream packet, is inserted before the isochronous packet for-
mat and ATGo is then issued. In this manner, the following packet is transmitted as an asynchronous stream packet. In this
case, however, the relationship of tCode=0xA is required to hold. The data being transmitted actually are those of 2Quadlet
and thereafter. For the asynchronous stream packet transmission, arbitration is carried out in the same manner as for ordi-
nary asynchronous performance, and data are transmitted to a party other than the IsochronousCycle.
The header CRC and the payload CRC are automatically generated inside the MD8412B and both are added before trans-
mission.
5-8-2
Asynchronous stream reception
When a packet, which coincides with the channel of the asynchronous stream, is detected during reception, the
MD8412B stores it in the ARF buffer. The data format is as specified below. At that time, the relationship of tCode=0xA
holds. The last AckSent indicates the status of reception at the MD8412B. The same value as that for the asynchronous
reception is stored. If the ARF buffer is full in this case, the ARFFlush interrupt occurs and no data are stored in the ARF
buffer. (This is not an interrupt of the isochronous system.)
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
spd
tCode
reserved
dataLength
tag
channel
sy
Asynchronous Stream data
padding (if necessary)
Table 5-8-1 Asynchronous Stream Transmit format
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
dataLength
tag
channel
tCode
sy
Asynchronous Stream data
spd
errCode
Table 5-8-2 Asynchronous Stream Receive format
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