M7010R View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'M7010R' PDF : 67 Pages View PDF
M7010R
Mixed-sized Searches on Tables Configured with Different Width Using an M7010R Device
This subsection will cover mixed searches (x68,
x136, and x272) with tables of different widths
(x68, x136, and x272). The sample operation
shown is for a single device with CFG = 10010000,
containing three tables of x68, x136, and x272
widths. The operation can be generalized to a
block of 8 to 31 devices using four blocks; the tim-
ing and the pipeline operation is the same as de-
scribed previously for fixed searches on a table of
one-width-size.
Figure 34, page 47 shows three sequential
searches; first, a 68-bit SEARCH on a table con-
figured as x68, then a 136-bit SEARCH on a table
configured as x136, and finally a 272-bit SEARCH
on the table configured as x272. Each results in a
hit.
Note: The DQ[67:66] will be “00” in each of the two
A and B Cycles of the x68-bit SEARCH (Search1).
DQ[67:66] is “01” in each of the A and B Cycles of
the x136-bit SEARCH (Search2). DQ[67:66] is
“10” in each of the A, B, C, and D Cycles of the
x272-bit SEARCH (Search3). By having table des-
ignation bits, the M7010R device enables the cre-
ation of many tables of different widths in a bank of
search engines.
Figure 33 shows the sample table. Two bits in
each 68-bit entry need to be designated as table
number bits. One example choice might be: the
“00” values for the table configured as x68, “01”
values for tables configured as x136, and “10” val-
ues for tables configured as x272. For the above
explanation, it is further assumed that bits for
DQ[67:66] for each entry will be designed as such
table designation bits.
Figure 33. Multiwidth Configuration Example
68
8K
2K
136
1K
272
CFG = 10010000
AI07046
46/67
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