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| 型號： | PXB4340E |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | ICs for Communications |
| 中文描述： | 通信集成電路 |
| 文件頁數(shù)： | 49/66頁 |
| 文件大?。?/td> | 869K |
| 代理商： | PXB4340E |
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3;%)
Data Sheet
6-49
07.2000
,QWHUIDFH'HVFULSWLRQ
In summary, the condition for the CAME to become active at the end of an error-free search
cycle is:
If the Slave receives 00 for “Mismatch” on CI(1..0) and recognizes an internal “Single Match” or
“Multimatch” condition it may respond to the master; it must not respond in all other cases.
A master will not respond at the end of the current command cycle only if it detects an internal
“Mismatch” condition and the slave reports at CI(1..0) with 01 no “Mismatch”; in all other cases
the master responds.
In the case of a communication fault at the beginning of a request, the determination of which
chip may respond is not performed. The reason may be a parity error. To avoid bus conflicts, the
slave always must be controlled by the master chip for data output in case of reading. This is
done by the master with the CO(2) signal.
If the slave outputs the codes 10 (no request processed) or 11 (request #4..6 processed) at
CO(1..0) while the master processes a search request, the overall status “cascade error” is
reported by the master.
If the master processes one of the requests without searching, then only if the slave outputs the
code 10 (no request processed) is the overall status “cascade error”. In the other cases, no error
is recognized. The code 00 from a slave is accepted intentionally, even if it pretends a search
operation, because, for non-cascaded applications, the CI(2..0) inputs are connected to ground.
Finally, if the master holds the internal status “data bus parity error” or “command cycle error,”
no request is processed by the master. In this case, the slave status is ignored.
This behavior is summarized in
WDEOH
. The master will always report the cascade, parity, and
command cycle errors.
7DEOH
5HVSRQGLQJ'HYLFHDQG2YHUDOO5HVXOWDIWHU6HDUFK2SHUDWLRQ
0DVWHU'HYLFH
Mismatch
Master.CO(1..0) = 00
Single Match
Master.CO(1..0) = 01
Multimatch
Master.CO(1..0) = 01
6ODYH'HYLFH
Mismatch
Slave.CO(1..0) = 00
Master: Mismatch
Slave: inactive
Master: Single Match
Slave: inactive
Master: Multimatch
Slave: inactive
Single Match
Slave.CO(1..0) = 01
Master: inactive
Slave: Single Match
Master: Multimatch
Slave: inactive
Master: Multimatch
Slave: inactive
Multimatch
Slave.CO(1..0) = 01
Master: inactive
Slave: Multimatch
Master: Multimatch
Slave: inactive
Master: Multimatch
Slave: inactive
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