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参数资料
型号： M7020R-083ZA1T
厂商： 意法半导体
英文描述： 32K x 68-bit Entry NETWORK SEARCH ENGINE
中文描述： 32K的× 68位进入网络搜索引擎
文件页数： 63/150页
文件大小： 996K
代理商： M7020R-083ZA1T
63/150
M7020R
The logical 136-bit search operation is shown in
Figure 43, page 65. The entire table of 136-bit en-
tries is compared to a 136-bit word K (presented
on the DQ Bus in 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 the GMR Index in the
command’s Cycle A. The 136-bit word K (present-
ed on the DQ Bus in Cycles A and B of the com-
mand) 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
comparand register stored in an even location,
and the odd comparand register stored in an adja-
cent odd location. The word K (presented on the
DQ Bus in Cycles A and B of the command) is
compared with each entry in the table starting at
location “0.” The first matching entry’s location ad-
dress, “L,” is the winning address that is driven as
part of the SRAM address on the SADR[21:0] lines
(see SRAM ADDRESSING, page 126).
Note:
The matching address is always going to an
even address for a 136-bit SEARCH.
The SEARCH command is a pipelined operation
that executes searches at half the rate of the fre-
quency of CLK2X for 136-bit searches in x136-
configured tables. The latency of SADR, CE_L,
ALE_L, WE_L, SSV, and SSF from the 136-bit
SEARCH command cycle (two CLK2X cycles) is
shown in Table 33, page 65.
For a single device in the table with TLSZ = 00, the
latency of the SEARCH from command to SRAM
access cycle is 4. In addition, SSV and SSF shift
further to the right for different values of HLAT, as
specified in Table 34, page 65.
Figure 41. Hardware Diagram for a Table with 1 Device
DQ[67:0]
CMDV, CMD[8:0]
SSF, SSV
SRAM
BHI[2:0]
BHO[2:0]
LHO[1]
LHI
3
2
1
0
M7020R
LHO[0]
6
5
4
AI06329
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