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參數(shù)資料
| 型號(hào)： | M7020R-083ZA1T |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 32K x 68-bit Entry NETWORK SEARCH ENGINE |
| 中文描述： | 32K的× 68位進(jìn)入網(wǎng)絡(luò)搜索引擎 |
| 文件頁數(shù)： | 118/150頁 |
| 文件大?。?/td> | 996K |
| 代理商： | M7020R-083ZA1T |
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M7020R
118/150
LEARN COMMAND
Bit [0] of each 68-bit data location specifies wheth-
er an entry in the database is occupied. If all the
entries in a device are occupied, the device as-
serts FULO signal to inform the downstream de-
vices that it is full.
The result of this communication between depth-
cascaded devices determines the global FULL
signal for the entire table. The FULL signal in the
last device determines the fullness of the depth-
cascaded table.
In a depth-cascaded table, only a single device will
learn the entry through the application of a LEARN
Instruction. The determination of which device is
going to learn is based on the FULI and FULO sig-
nalling between the devices. The first non-full de-
vice learns the entry by storing the contents of the
specified comparand registers to the location(s)
pointed to by NFA.
In a x68-configured table the LEARN command
writes a single 68-bit location. In a x136-config-
ured table the LEARN command writes the next
even and odd 68-bit locations. In 136-bit mode,
Bit[0] of the even and odd 68-bit locations is ’0,’
which indicates they are cascaded empty, or ’1,’
which indicates they are occupied.
The global FULL signal indicates to the Table Con-
troller (the host ASIC) that all entries within a block
are occupied and that no more entries can be
learned. The M7020R updates the signal after
each WRITE or LEARN command to a data array.
The LEARN command generates a WRITE cycle
to the external SRAM, also using the NFA register
as part of the SRAM address (see SRAM AD-
DRESSING, page 126).
The LEARN command is supported on a single
block containing up to eight devices if the table is
configured either as a x68 or a x136. The LEARN
command is not supported for x272-configured ta-
bles.
LEARN is a pipelined operation and lasts for two
CLK cycles, as shown in Figure 87, page 119
where TLSZ = 00, and Figure 88, page 120 and
Figure 89, page 121 where TLSZ = 01 (which as-
sume the device performing the LEARN operation
is not the last device in the table and has its LRAM
Bit set to ’0.’
Note:
The OE_L for the device with the LRAM Bit
set goes high for two cycles for each LEARN (one
during the SRAM WRITE cycle, and one the cycle
before). The latency of the SRAM WRITE cycle
from the second cycle of the Instruction is shown
in Table 49, page 121.
The sequence of operation is as follows:
–
Cycle 1A
: The host ASIC applies the LEARN In-
struction on the CMD[1:0], using CMDV = 1.
The CMD[5:2] field specifies the index of the
comparand register pair that will be written in
the data array in the 136-bit-configured table.
For a LEARN in a 68-bit-configured table, the
even-numbered comparands specified by this
index will be written. CMD[8:7] carries the bits
that will be driven on SADR[21:20] in the SRAM
WRITE cycle.
–
Cycle 1B
: The host ASIC continues to drive
CMDV to '1,' CMD[1:0] to '11,' and CMD[5:2]
with the comparand pair index. CMD[6] must be
set to '0' if the LEARN is being performed on a
68-bit-configured table, and to '1' if the LEARN
is being performed on a 136-bit-configured ta-
ble.
–
Cycle 2:
The host ASIC drives the CMDV to '0.'
At the end of Cycle 2, a new instruction can be-
gin. The latency of the SRAM WRITE is the
same as the search to the SRAM READ Cycle.
It is measured from the second cycle of the
LEARN Instruction.
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| M702-230442 | 功能描述:火線接頭 IEEE 1394 SMT 4P HORIZONTAL RoHS:否 制造商:Molex 產(chǎn)品:IEEE 1394 Firewire Connectors 標(biāo)準(zhǔn):IEEE 1394 位置/觸點(diǎn)數(shù)量:6 節(jié)距:2 mm 觸點(diǎn)電鍍:Unplated 觸點(diǎn)材料:Phosphor Bronze 型式:Female 電流額定值:0.5 A 安裝風(fēng)格:Through Hole 端接類型:Solder Tab 連接器類型:Firewire Receptacle |
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| M7023 | 制造商:Tamura Corporation of America 功能描述: |
| M7027 | 功能描述:數(shù)字萬用表 Dual Display Multime 0.3% Accuracy RoHS:否 制造商:Tektronix 產(chǎn)品:Multimeters 類型:Bench 準(zhǔn)確性:0.04 % 電壓范圍:2 V to 2 kV 電阻范圍: 電容范圍: 顯示計(jì)數(shù): 頻率:10 Hz to 45 Hz, 850 Hz to 1 MHz 測距: 真均方根值: 數(shù)據(jù)保持: |
| M7029 | 功能描述:數(shù)字萬用表 Dual Display Multime 0.2% Accuracy RoHS:否 制造商:Tektronix 產(chǎn)品:Multimeters 類型:Bench 準(zhǔn)確性:0.04 % 電壓范圍:2 V to 2 kV 電阻范圍: 電容范圍: 顯示計(jì)數(shù): 頻率:10 Hz to 45 Hz, 850 Hz to 1 MHz 測距: 真均方根值: 數(shù)據(jù)保持: |
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