參數(shù)資料
型號： M7020R-083ZA1T
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)： 89/150頁
文件大小： 996K
代理商： M7020R-083ZA1T
89/150
M7020R
The logical 272-bit SEARCH operation is shown in
Figure 65, page 91. The entire table of 272-bit en-
tries is compared to a 272-bit word K that is pre-
sented on the DQ Bus in Cycles A, B, C, and D of
the command using the GMR and local mask bits.
The GMR is the 272-bit word specified by the two
pairs of GMRs selected by the GMR Indexes in the
command’s Cycles A and C. The 272-bit word K
that is presented on the DQ Bus in Cycles A, B, C,
and D of the command is compared with each en-
try in the table starting at location “0.” The first
matching entry’s location address, “L,” is the win-
ning address that is driven as part of the SRAM
address on SADR[21:0] lines (see SRAM AD-
DRESSING, page 126).
Note:
The matching address is always going to be
location “0” in a four-entry page for a 272-bit
SEARCH (two LSBs of the matching index will be
'00').
The SEARCH command is a pipelined operation
and executes at one-fourth the rate of the frequen-
cy of CLK2X for 272-bit searches in x272-config-
ured tables. The latency of SADR, CE_L, ALE_L,
WE_L, SSV, and SSF from the 272-bit SEARCH
command (measured in CLK cycles) from the
CLK2X cycle that contains the C and D Cycles is
shown in Table 41, page 91.
The latency of a SEARCH from command to
SRAM access cycle is 4 for only 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 42, page 91.
Figure 63. Hardware Diagram for a Table with One Device
DQ[67:0]
CMDV, CMD[8:0]
SSF, SSV
SRAM
BHI[2:0]
BHO[2:0]
LHO[1]
3
2
1
0
M7020R
LHO[0]
6
5
4
AI05695
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