M7010R datasheet(41/67 Pages) STMICROELECTRONICS

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M7010R

136-bit Logical SEARCH

The logical, 136-bit SEARCH operation is shown

in Figure 29. The entire table of 136-bit entries is

compared to a 136-bit word K (presented on the

DQ Bus in both Cycles A and B of the command)

using the GMR and the local mask bits. The GMR

is the 136-bit word specified by the even and odd

global mask pair selected by GMR Index in the

command’s Cycle A. The 136-bit word K (present-

ed on the DQ Bus in both Cycles A and B of the

command) is also stored in both even and odd

comparand register pairs selected by the Com-

parand Register Index in the command’s Cycle B.

The two comparand registers can subsequently

be used by the LEARN command with the even-

numbered comparand register stored in an even-

numbered location, and the odd-numbered com-

parand register stored in an adjacent, odd-num-

bered location. The word K (presented on the DQ

Bus inCycles A andB of thecommand)is com-

pared with each entry in the table starting at loca-

tion “0.” The first matching entry’s location,

address “L,” is the winning address that is driven

as part of the SRAM address on the SADR[21:0]

lines.

Note: The matching address is always going to be

even-numbered

address

for

136-bit

SEARCH.

Figure 29. x136 Table with One Device

Comparand Register (even)

Comparand Register (odd)

CFG = 01010101

16382

(136-bit Configuration)

Location

address

135

GMR

Even

Odd

135

AI07042

(First matching entry)

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