參數(shù)資料
型號: M7040N-100ZA1T
廠商: 意法半導(dǎo)體
英文描述: 64K x 72-bit Entry NETWORK PACKET SEARCH ENGINE
中文描述: 64K的× 72位的網(wǎng)絡(luò)數(shù)據(jù)包進(jìn)入搜索引擎
文件頁數(shù): 119/159頁
文件大?。?/td> 1088K
代理商: M7040N-100ZA1T
119/159
M7040N
Figure 89. Multi-Width Configurations Example
Table 50. Searches with CFG_L Set HIGH
LRAM AND LDEV DESCRIPTION
When search engines are cascaded using multiple
M7040Ns, the SADR, CE_L, and WE_L (3-state
signals) are all tied together. In order to eliminate
external pull-up and pull-downs, one device in a
bank is designated as the default driver. For non-
SEARCH or non-LEARN cycles (see LEARN
COMMAND in the section below) or search cycles
with a global miss, the SADR, CE_L, and WE_L
signals are driven by the device with the LRAM Bit
set.
Note:
It is important that only one device in a bank
of search engines that are cascaded have this bit
set. Failure to do so will cause contention on
SADR, CE_L, WE_L, and can potentially cause
damage to the device(s).
Similarly, when search engines using multiple
M7040Ns are cascaded, SSF and SSV (also 3-
state signals) are tied together. In order to elimi-
nate external pull-up and pull-downs, one device
in a bank is designated as the default driver. For
non-SEARCH cycles or SEARCH cycles with a
global miss the SSF and SSV signals are driven by
the device with the LDEV Bit set.
Note:
It is important that only one device in a bank
of search engines that are cascaded together
have this bit set. Failure to do so will cause conten-
tion on SSV and SSF and can potentially cause
damage to the device(s).
CMD[9]
CMD[2]
SEARCH
0
0
Search 72-bit-configured partitions only
1
0
Search 144-bit-configured partitions only
X
1
Cycles A and B for searching 288-bit-configured partitions
X
0
Cycles C and D for searching 288-bit-configured partitions
32 K
8 K
4 K
72
144
288
CFG = 10 10 01 01 00 00 00 00
AI04731
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