參數(shù)資料
型號: M7040N
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)包進入搜索引擎
文件頁數(shù): 22/159頁
文件大小: 1088K
代理商: M7040N
M7040N
22/159
Figure 12. Clocks for All Timing Diagrams
PLL USAGE
When the device first powers up, it takes 0.5 ms to
lock the internal phase-lock loop (PLL). During this
locking of the PLL, in addition to 32 extra CLK1X
cycles in CLK1X mode and 64 extra cycles in
CLK2X mode, the RST_L must be held low for
proper initialization of the device. Setup and hold
requirements will change in CLK1X mode if the
duty cycle of the CLK1X is varied. All signals into
the device in CLK1X mode are sampled by a clock
that is generated by multiplying CLK1X by two.
Since PLL has a locking range, the device will only
work between the range of frequencies specified
in the timing specification section.
REGISTERS
All registers in the M7040N are 72 bits wide. The
M7040N contains 16 pairs of comparand storage
registers, 16 pairs of global mask registers
(GMRs), eight search successful index registers
and one each of command, information, burst
READ, burst WRITE, and next-free address regis-
ters. Table 9 provides an overview of all the
M7040N registers. The registers are ordered in as-
cending address order. Each register group is then
described in the following subsections.
Table 9. Register Overview
CLK2X
PHS_L
CLK1X
AI04666
(Use for CLK1X MODE)
(Use for CLK1X MODE)
Address
Abbreviation
Type
Name
0
31
COMP0
31
R
32 Comparand Registers. Stores comparands from the DQ Bus for
learning later.
32
47, 96
111
MASKS
RW
16 Global Mask Registers Pairs.
48
55
SSR0
7
R
8 SEARCH Successful Index Registers.
56
COMMAND
RW
Command Register.
57
INFO
R
Information Register.
58
RBURREG
RW
Burst Read Register.
59
WBURREG
RW
Burst Write Register.
60
NFA
R
Next Free Address Register.
61
63
Reserved
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