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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(yè)數(shù)： | 80/114頁(yè) |
| 文件大?。?/td> | 577K |
| 代理商： | MD8412B |
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MD8412B
68
FUJIFUILM MICRODEVICES CO., LTD.
Ver 1.10
5-3
Buffer access
5-3-1
Buffer configuration
The MD8412B incorporates a memory buffer with a total capacity of 2K-bytes in 512x32word configuration. To achieve
rate absorption in terms of host access rate and serial bus transfer rate, the buffer is temporarily used between host bus and
transmitter.
The buffer control block of MD8412B divides this buffer into a maximum of 4 blocks, and control is effected in the unit
of divided sub-buffer.
Two blocks are assigned to asynchronous transmission and reception. (Referred to as ATF for asynchronous transmission
buffer and ARF for asynchronous reception buffer)
When performing isochronous transmission or reception, the relevant buffers are assigned to the remaining two blocks.
According to the contents of IsoMode setting register in the control register, however, combination of these two blocks is
defined if they are to be used for transmit/receive, or receive/receive, or receive only. In the Isochronous mode other than
IsoMode="011" or "101" two sub-buffers are assigned for isochronous transmission and reception, respectively. When Iso-
Mode="011" two isochronous channels are limited to reception only, and hence isochronous transmission is impossible to
achieve. When IsoMode ="101" only one sub-buffer for receive.
For these reasons, one of the two sub-buffers is changed over for isochronous reception when isochronous transfer is
attempted, and the other is changed over for transmission and reception through IsoMode setting. (Referred to as ATF/IRF
for asynchronous transmission/isochronous reception buffer and IRF for isochronous reception buffer hereafter)
From the host, access is made to ATF from the ATF register, ARF from the ARF register, IRF from the IRF register, and
ITF/IRF from the ITF/IRF register.
Figure 5-3-1 Buffer Assignment in Cases Other than IsoMode="011b"
ATF Register
ARF Register
ITF/IRF Register
IRF Register
Asynchronous
Transmitter Buffer(ATF)
Asynchronous
Receiver Buffer(ARF)
Isochronous
Transmitter Buffer(ITF)
Isochronous
Receiver Buffer(IRF)
Register
Memory Buffer
512*32word=2Kbyte
Host
Transmitter
Receiver
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