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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)： | 32/114頁(yè) |
| 文件大小： | 577K |
| 代理商： | MD8412B |
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MD8412B
20
FUJIFUILM MICRODEVICES CO., LTD.
Ver 1.10
3-2-10 ATRetries Register
Index
24h
Initial value
0000 0001h
There is a function of performing automatic retry when asynchronous packet transmission is attempted by the MD8412B
node and Busy Acknowledge is returned from this destination node. The number of retries is set in this register. Once a
retry phase is assumed, a busy flag of the ATGo register is never negated until any Acknowledge other than Busy is
returned from the destination node or the preset number of retries is attained. In this state, the next packet transmission is
disabled.
Bit 3~0
MaxRetryCount
: Maximum Retry Count bit (RW- Initial value: 01h)
This register sets up the maximum number of retries for Busy Acknowledge from the destination node. If the
retry phase is not completed within this set value, a retry time-out status flag is given in the ATAck register to
complete the retry phase attempted by the MD8412B. Since then, packet data are flushed within the ATF buffer.
The maximum number that can be set is 15. When "0000" is set, the MD8412B does not assume a retry phase
automatically. In this case, packet data are flushed for Busy Acknowledge. When an error Acknowledge is
returned in the retry phase, retry is suspended at that time point and contents of the buffer are flushed. Further
operation is halted by presenting a flag (AckErr).
Bit 7~4
RetryCount
: Retry Count bit (R- Initial value: 00h)
The number of present retries is indicated in the middle of a retry attempted from MD8412B.
Bit 8
RetryStop
: Retry Stop Bit (RW- Initial value: 0b)
When the MD8412B automatically assumes the retry phase and the limit value is not attained yet during this
retry action, this bit is used to perform the forced end of this retry. When this bit is set at "1", it is automatically
cleared after the completion of the retry phase.
0: Normal condition
1: Forced end
7
6
5
4
3
2
1
0
RetryCount
MaxRetryCount
15
14
13
12
11
10
9
8
RetryStop
23
22
21
20
19
18
17
16
31
30
29
28
27
26
25
24
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