PXB4360F Datasheet, PDF (48/66 Pages) Infineon Technologies AG – ICs for Communications

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determines which chip performs the operations and may send back the results to ALP.
Therefore, the chip not selected chip must also wait for the end of the current request before a
new request may be started. In search cycles, both CAME chips start searching in parallel. Only
one chip will respond to ALP, determined by the search result. Only for test request #6 must an
extra bit, TESTMODE(9), be spent in the instruction word for selection between master and
slave.
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Search - Requests #1..3
Refer to table 4
Write - Request #4
0 ≤ LCI ≤ 8191
Read - Request #5
0 ≤ LCI ≤ 8191
Test - Request #6
TESTMODE(9) = 0
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8192 ≤ LCI ≤ 16383
8192 ≤ LCI ≤ 16383
TESTMODE(9) = 1
With two cascaded CAME chips, each CAME first searches alone. When the match state of
master and slave is known, the master reports his local result to the slave. It is only necessary
to report “mismatch” or “not mismatch” conditions. The same is done by the slave. Both chips
determine their reaction and the overall status according to WDEOH , which includes all
combinations of local master and slave search results. The fields of this table contain the overall
status of the result for which device returns the result to ALP and which stays inactive.
For example, if both chips detect a single match, the slave knows about its own state and the
detection of at least an additional match in the master (Master.CO(2..0) = Slave.CI(2..0)) and
knows that a global multimatch results. As the slave in this case, it must not respond to ALP. The
master also detects a global multimatch the same way (Slave.CO(2..0) = Master.CI(2..0)) and
responds to ALP.
Data Sheet
6-48
07.2000