- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄380224 > CYNSE70064A (Cypress Semiconductor Corp.) Search Engine PDF資料下載
參數(shù)資料
| 型號： | CYNSE70064A |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | Search Engine |
| 中文描述： | 搜索引擎 |
| 文件頁數(shù)： | 46/127頁 |
| 文件大小： | 3275K |
| 代理商： | CYNSE70064A |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁當(dāng)前第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁
CYNSE70064A
Document #: 38-02041 Rev. *E
Page 46 of 127
The logical 68-bit Search operation is shown in
Figure 10-26
. The entire table (31 devices of 68-bit entries) is compared to a
68-bit word K (presented on the DQ bus in both cycles A and B of the command) using the GMR and the local mask bits. The
effective GMR is the 68-bit word specified by the identical value in both even and odd GMR pairs in each of the eight devices and
selected by the GMR Index in the command’s cycle A. The 68-bit word K (presented on the DQ bus in both cycles A and B of the
command) is also stored in both even and odd comparand register pairs in each of the eight devices and selected by the
Comparand Register Index in command’s cycle B. In the ×68 configuration, the even comparand register can be subsequently
used by the Learn command only in the first non-full device. The word K (presented on the DQ bus in both cycles A and B of the
command) is compared with each entry in the table starting at location 0. The first matching entry’s location address L is the
winning address that is driven as part of the SRAM address on the SADR[21:0] lines (see “SRAM Addressing” on page 100). The
global winning device will drive the bus in a specific cycle. On global miss cycles the device with LRAM = 1 and LDEV = 1 will be
the default driver for such missed cycles.
The Search command is a pipelined operation and executes a Search at half the rate of the frequency of CLK2X for 68-bit
searches in ×68-configured tables. The latency of SADR, CE_L, ALE_L, WE_L, SSV, and SSF from the 68-bit Search command
cycle (two CLK2X cycles) is shown in
Table 10-16
.
Table 10-16. The Latency of Search from Instruction to SRAM Access Cycle
Number of Devices
Max Table Size
1 (TLSZ = 00)
32K × 68 bits
1–8 (TLSZ = 01)
256K × 68 bits
1–31 (TLSZ = 10)
996K × 68 bits
For up to 31 devices in the table (TLSZ = 10), Search latency from command to SRAM access cycle is 6. In addition, SSV and
SSF shift further to the right for different values of HLAT, as specified in
Table 10-17
.
Table 10-17. Shift of SSF and SSV from SADR
HLAT
000
001
010
011
100
101
110
111
Latency in CLK Cycles
4
5
6
Number of CLK Cycles
0
1
2
3
4
5
6
7
CFG = 00000000
(68-bit configuration)
67
0
Location
address
0
1
2
3
1015807
K
GMR
Comparand Register (odd)
K
Comparand Register (even)
K
67
0
67
0
(First matching entry)
L
Must be same in each of the 31
devices
Will be same in each of the 31
devices
Figure 10-26.
×
68 Table with 31 Devices
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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。