参数资料
型号: M7020R-050ZA1T
厂商: 意法半导体
英文描述: CAP TANT 22UF 10V 20% POLY SMD
中文描述: 32K的× 68位进入网络搜索引擎
文件页数: 115/150页
文件大小: 996K
代理商: M7020R-050ZA1T
115/150
M7020R
Table 47. Latency of SEARCH from Cycles C and D to SRAM Access Cycle, 272-bit, Up to 31
Devices
Table 48. Shift of SSF and SSV from SADR
MIXED SEARCHES
Tables Configured with Different Widths Using
an M7020R
The sample operation shown is for a single device
with CFG = 1001000. It contains three tables of
x68, x136, and x272 widths. The operation may be
generalized to a block of 8–31 devices using four
blocks; the timing and the pipeline operation is the
same as described previously for fixed searches
on a table of one-width-size.
Figure 85, page 116 shows three sequential
searches:
– a 68-bit search on the table configured as x68;
– a 136-bit search on a table configured as x136;
and
– a 272-bit search on the table configured as x272
bits that each results in a hit.
Note:
The DQ[67:66] will be '00' in both of the Cy-
cles A and B of the x68-bit search (Search1).
DQ[67:66] is '01' in both of the Cycles A and B of
the x136-bit search (Search2). DQ[67:66] is '10' in
all of the Cycles A, B, C, and D of the x272-bit
search (Search 3). By having table designation
bits, the M7020R enables the creation of many ta-
bles in a bank of search engines of different
widths.
Figure 86, page 117 shows the sample table. Two
bits in each 68-bit entry will need to designated as
the Table Number Bits. One example choice can
be the '00' values for the table configured as x68,
'01' values for tables configured as x136, and '10'
values for tables configured as x272. For the
above explanation, it is further assumed that bits
[67:66] for each entry will be designed as these
Table Designation Bits.
# of devices
Max Table Size
Latency in CLK Cycles
1 (TLSZ = 00)
8K x 272-bit
4
2–8 (TLSZ = 01)
64K x 272-bit
5
9–31 (TLSZ = 10)
248K x 272-bit
6
HLAT
Number of CLK Cycles
000
0
001
1
010
2
011
3
100
4
101
5
110
6
111
7
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