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| 型號(hào)： | CYNSE70064A |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | Search Engine |
| 中文描述： | 搜索引擎 |
| 文件頁(yè)數(shù)： | 17/127頁(yè) |
| 文件大?。?/td> | 3275K |
| 代理商： | CYNSE70064A |
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CYNSE70064A
Document #: 38-02041 Rev. *E
Page 17 of 127
8.0
NSE Architecture and Operation Overview
The CYNSE70064A consists of 32K × 68-bit storage cells referred to as data bits. There is a mask cell corresponding to each
data cell.
Figure 8-1
shows the three organizations of the device based on the value of the CFG bits in the command register.
136
68
During a Search operation, the Search data bit (S), data array bit (D), mask array bit (M) and the global mask bit (G) are used in
the following manner to generate a match at that bit position (see
Table 8-1
). The entry with a match on every bit position results
in a successful Search during a Search operation.
Table 8-1. Bit Position Match
G
M
D
0
X
X
1
0
X
1
1
0
1
1
1
1
1
0
1
1
1
In order for a successful Search within a device to make the device the local winner in the Search operation, all 68-bit positions
must generate a match for a 68-bit entry in 68-bit configured quadrants, or all 136-bit positions must generate a match for two
consecutive even and odd 68-bit entries in quadrants configured as 136 bits, or all 272-bit positions must generate a match for
four consecutive entries aligned to four entry-page boundaries of 68-bit entries in quadrants configured as 272 bits.
An arbitration mechanism using a cascade bus determines the global winning device among the local winning devices in a Search
cycle. The global winning device drives the SRAM bus, SSV, and the SSF signals. In case of a Search failure, the device(s) with
the LDEV and LRAM bits set drives the SRAM bus, SSF, and SSV signals.
The CYNSE70064A device can be configured to contain tables of different widths, even within the same chip.
Figure 8-2
shows
a sample configuration of different widths.
68
S
X
X
0
0
1
1
Match
1
1
1
0
0
1
Data
16 K
Data
Masks
8 K
272
CFG = 01010101
CFG = 10101010
D
M
32K
CFG = 00000000
Figure 8-1. CYNSE70064A Database WIDTH Configuration
Masks
4 K
136
8 K
8 K
68
2 K
272
CFG = 10010000
Figure 8-2. Multiwidth Database Configurations Example
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CYNSE70064A-50BGC | Search Engine |
| CYNSE70064A-66BGC | Search Engine |
| CYNSE70064A-83BGC | Search Engine |
| CYP15G0101DXA | Single Channel HOTLink II Transceiver |
| CYP15G0101DXA-BBI | Single Channel HOTLink II Transceiver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CYNSE70064A-50BGC | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Search Engine |
| CYNSE70064A-66BG | 制造商:Cypress Semiconductor 功能描述: |
| CYNSE70064A-66BGC | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Search Engine |
| CYNSE70064A-83BGC | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Search Engine |
| CYNSE70128 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Network Processing |
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