參數(shù)資料
型號: CYNSE70064A-83BGC
廠商: CYPRESS SEMICONDUCTOR CORP
元件分類: 通信及網(wǎng)絡(luò)
英文描述: Search Engine
中文描述: SPECIALTY TELECOM CIRCUIT, PBGA272
封裝: 27 X 27 MM, 2.33 MM HEIGHT, PLASTIC, BGA-272
文件頁數(shù): 49/127頁
文件大?。?/td> 3275K
代理商: CYNSE70064A-83BGC
CYNSE70064A
Document #: 38-02041 Rev. *E
Page 49 of 127
10.10
The hardware diagram of the Search subsystem of eight devices is shown in
Figure 10-30
. The following are parameters
programmed into the eight devices.
First seven devices (devices 0–6): CFG = 01010101, TLSZ = 01, HLAT = 010, LRAM = 0, and LDEV = 0.
Eighth device (device 7): CFG = 01010101, TLSZ = 01, HLAT = 010, LRAM = 1, and LDEV = 1.
Note
. All eight devices must be programmed with the same value of TLSZ and HLAT. Only the last device in the table must be
programmed with LRAM = 1 and LDEV = 1 (device number 7 in this case). All other upstream devices must be programmed with
LRAM = 0 and LDEV = 0 (devices 0 through 6 in this case).
Figure 10-31
shows the timing diagram for a Search command in the 136-bit-configured table of eight devices for device 0.
Figure 10-32
shows the timing diagram for a Search command in the 136-bit-configured table consisting of eight devices for
device number 1.
Figure 10-33
shows the timing diagram for a Search command in the 136-bit configured table consisting of
eight devices for device number 7 (the last device in this specific table). For these timing diagrams, four 136-bit searches are
performed sequentially, and the following Hit/Miss assumptions were made (see
Table 10-20
).
Table 10-20. Hit/Miss Assumption
Search Number
1
Device 0
Hit
Miss
Device 1
Miss
Devices 2–6
Miss
Miss
Device 7
Miss
Miss
136-bit Search on Tables Configured as ×136 Using up to Eight CYNSE70064A Devices
2
3
4
Hit
Hit
Miss
Hit
Miss
Miss
Miss
Hit
Hit
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