KE5BLME064 View Datasheet(PDF) - KAWASAKI MICROELECTRONICS
Part Name
Description
MFG CO.
'KE5BLME064' PDF : 53 Pages View PDF
Kawasaki LSI
64K Longest Match Search Engine (KE5BLME064)
Notes:
PRELIMINARY
l Even if the signal of the CCMPN pin becomes low level on the completion of
the Insert command, the inserted data is not stored in the search table and the
Entry Counter is not increased when the search table is full (the signal of FLN
pin is low).
l The entry counter does not increase when IP address and PL (prefix length -1)
of the inserted data are the same as that of the retrieval table on the
completion of the Insert command.
l These status are known as the value of STAT1 register.
LME064 is capable of storing the exact data match, i.e., the entry data hitting only when
all the 40 bits coincide with the input key data. When inserting exact match data, set
39 to WR2 (PL[5:0]) because this device considers the prefix length to be a range of the
retrieval. This particular function is useful for storing the host address in the table.
4.5. Search
To conduct a longest match search, apply data to INP [39:0], and set a SRCHN pin Low
(see Fig.4.1). At the 18th clock after starting a search, MDONEN will be changed to
Low, allowing both MLE [5:0] and HON to output. MLE [5:0] output should be equal to
the match length minus one. That is to say, MLE [5:0] is the maximum value of the
match length of a search key minus 1. The HON status indicates a lookup result, with
Low a hit, and High as a miss hit. MDONEN will revert from High to Low after 4 clock
cycles, while both MLE [5:0] and HON will be held until the next lookup result.
At the 37th clock after starting a search, ODONEN will be changed into Low, allowing
OUT [17:0] to output associated data. If the search results in a miss match, the value
pre-registered at the default associated data will be returned and MLE[5:0] output is 00h.
ODONEN will revert from High to Low after 4 clock cycles, whereas OUT [17:0] will be
held until the next result. For instance, let us assume the presence of the following
data in the table:
0.133.5.0.0/24 [associated data: 01111h]
0.133.5.16.0/32 [associated data: 02222h]
Cf. Default associated data: 00000h
Version 2.5.4
Proprietary and Confidential
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