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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(yè)數(shù)： | 86/114頁(yè) |
| 文件大小： | 577K |
| 代理商： | MD8412B |
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MD8412B
74
FUJIFUILM MICRODEVICES CO., LTD.
Ver 1.10
5-3-4-1-1
Transmission buffer
When data are sent from the host to a buffer in transmission phase and ATGo is issued, the data contained in the AFT are
regarded as 1 packet. If there is still an empty in the ATF buffer after the issuing of ATGo, the host can write data of the
next sending packet in this ATF. In this manner, the MD8412B performs reciprocal control of ATF in one-packet unit on
host side and transmitter side. If the buffer status is not of Empty, the quantity of data the host can write next may be arbi-
trarily controlled according to the ATF size set by the BufferSizeSet register and the packet size presently being handled
for transmission by ATGo. Therefore, even though the BufferStatus register is not supervised, the host can identify
vacancy in buffers at any time.
The packet data presently transmitted are kept buffered in the ATF until Ack code of complete or pending is returned from
the related destination node. When the Ack code is Busy, the data buffered in the middle of retry phase are repeatedly trans-
mitted according to the frequency of retry. When a retry count value is exceeded the max value, or complete or pending Ack
code is returned during the operation, the area in the ATF, where the packet is contained, is automatically flushed. If an error
Ack code is received in the retry phase, this phase is stopped at that time point and flushing is effected regardless of whether
the retry maximum value is attained. In this case, even if the host has already written the next sending packet in a vacant area
of ATF in the buffer, there is no influence on the data.
When ATF reset is effected with ResetATF bit in the Reset register, the ATF is restored to its initial condition and all data
contained therein are lost, thus making the Empty flag active.
Figure 5-3-12 Concept of ATF Operation
Packet1
ATGo
Command
Packet2
Packet3
Packet1
Packet1
Packet2
Packet2
Packet2
Packet2
Packet3
Packet2
Packet2
Packet3
ATGo
Command
ATGo
Command
(a)
(c)
(e)
(b)
(d)
(f)
(g)
Host(write)
ATF
Link(Tranceiver)
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