參數(shù)資料
型號： M7020R
廠商： 意法半導體
英文描述： 32K x 68-bit Entry NETWORK SEARCH ENGINE
中文描述： 32K的× 68位進入網(wǎng)絡搜索引擎
文件頁數(shù)： 37/150頁
文件大?。?/td> 996K
代理商： M7020R
37/150
M7020R
The logical 68-bit SEARCH operation is shown in
Figure 21, page 39. The entire table consisting of
68-bit entries is compared to a 68-bit word K (pre-
sented on the DQ Bus in both Cycles A and B of
the command) using the GMR and the local mask
bits. The effective GMR is the 68-bit word speci-
fied by the identical value in both even and odd
GMR pairs selected by the GMR Index in the com-
mand’s Cycle A. The 68-bit word K (presented on
the DQ Bus in both Cycles A and B of the com-
mand) is also stored in both even and odd com-
parand register pairs selected by the Comparand
Register Index in the command’s Cycle B. In a x68
configuration, only the even comparand register
can be subsequently used by the LEARN com-
mand. The word K (presented on the DQ Bus in
both 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 address, “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).
The SEARCH command is a pipelined operation
and executes a SEARCH at half the rate of the fre-
quency of CLK2X for 68-bit searches in x68-con-
figured tables. The latency of SADR, CE_L,
ALE_L, WE_L, SSV, and SSF from the 68-bit
SEARCH command cycle (two CLK2X cycles) is
shown in Table 25, page 39.
The latency of a SEARCH from command to
SRAM access cycle is 4 for a single device in the
table and TLSZ = 00. In addition, SSV and SSF
shift further to the right for different values of
HLAT, as specified in Table 26, page 39.
Figure 19. Hardware Diagram for a Table with One Device
DQ[67:0]
CMDV, CMD[8:0]
SSF, SSV
SRAM
BHI[2:0]
BHI[2:0]
LHO[1]
3
2
1
0
M7020R
LHO[0]
6
5
4
AI05664
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