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| 型號： | 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)： | 87/114頁 |
| 文件大小： | 577K |
| 代理商： | MD8412B |
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MD8412B
Ver 1.10
FUJIFUILM MICRODEVICES CO., LTD.
75
5-3-4-1-2
Reception buffer
Handling of the ARF for asynchronous reception buffer is basically the same as for transmission. When all contents of
the received packet have been written in the ARF by the receiver, the host can read out the packet from the ARF. At that
time, even though the host does not read out the packet from the ARF, writing operation into the ARF of the next packet
from the receiver is effected, provided that there is still another vacancy in the ARF buffer. In this fashion, reciprocal con-
trol is effected even in the ARF. For example, assuming that the ARF presently contains one packet that can already be
read out by the host and the next packet written from the receiver, the timing to permit writing of a new packet from the
receiver into the ARF is defined as when the host has read out all contents of one packet. Therefore, under the condition
that data of one packet plus a are remaining in the ARF, the receiver cannot write a new packet in the ARF. As a result, a
BusyAck code is returned to the source node and a request is made for another transmission of the packet. When the host
reads out a received packet from the MD8412B and concludes according to the contents that the header and successive data
are not required for a certain reason, the host can flush all the data from the ARF using the ARFFlush bit in the BufferCon-
trol register, without performing wasteful reading of these data. Even when writing of a packet by the receiver has been
already finished into the ARF, there is no influence on these data.
When ARF reset is effected with ResetARF bit in the Reset register, the ARF is restored to its initial condition and all
data contained therein are lost. If the Full bit has been active, it is turned non-active.
Figure 5-3-13 Concept of ARF Operation
Packet2
Packet2
Packet2
Packet2
Packet3
(f)
(g)
(h)
Packet3
Packet3
Packet5
Packet5
Packet1
Packet2
Packet4
Packet1
Packet1
Packet2
Packet2
(a)
(c)
(e)
(b)
(d)
Link(Receiver)
ARF
Host(Read)
Packet3
Packet3
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