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參數(shù)資料
| 型號： | CYNSE70256 |
| 英文描述： | Network Processing |
| 中文描述： | 網(wǎng)絡(luò)處理 |
| 文件頁數(shù)： | 26/126頁 |
| 文件大?。?/td> | 3302K |
| 代理商： | CYNSE70256 |
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CYNSE70032
Document #: 38-02042 Rev. *E
Page 26 of 126
Table 13-1.
Search Latency from Instruction to SRAM Access Cycle
Number of Devices
1 (TLSZ = 00)
1–8 (TLSZ = 01)
1–31 (TLSZ = 10)
Search latency from command to SRAM access cycle is 4 for a single device in the table with TLSZ = 00. In addition, SSV and
SSF shift further to the right for different values of HLAT as specified in
Table 13-2
.
13.2
The hardware diagram of the Search subsystem of eight devices is shown in
Figure 13-4
. The following are the parameters
programmed into the eight devices.
First seven devices (devices 0–6): CFG = 00000000, TLSZ = 01, HLAT = 010, LRAM = 0, and LDEV = 0.
Eighth device (device 7): CFG = 00000000, TLSZ = 01, HLAT = 010, LRAM = 1, and LDEV = 1.
Note
.
All eight devices must be programmed with the same values for TLSZ and HLAT. Only the last device in the table (device
number 7 in this case) must be programmed with LRAM = 1 and LDEV = 1. All other upstream devices (devices 0 through 6 in
this case) must be programmed with LRAM = 0 and LDEV = 0.
Figure 13-5
shows the timing diagram for a Search command in the 68-bit-configured table of eight devices for device number 0.
Figure 13-6
shows the timing diagram for a Search command in the 68-bit-configured table of eight devices for device number 1.
Figure 13-7
shows the timing diagram for a Search command in the 68-bit-configured table of eight devices for device number 7
(the last device in this specific table). For these timing diagrams four 68-bit searches are performed sequentially. HIT/MISS
assumptions were made as shown below in
Table 13-3
.
68-bit Search on Tables Configured as ×68 Using up to Eight CYNSE70032 Devices
Max Table Size
16K × 68 bits
128K × 68 bits
496K × 68 bits
Latency in CLK Cycles
4
5
6
Table 13-2. Shift of SSF and SSV from SADR
HLAT
000
001
010
011
100
101
110
111
Number of CLK Cycles
0
1
2
3
4
5
6
7
Table 13-3. HIT/MISS Assumption
Search Number
Device 0
Device 1
Devices 2–6
Device 7
1
2
3
4
Hit
Miss
Miss
Miss
Miss
Hit
Miss
Miss
Hit
Hit
Miss
Hit
Miss
Miss
Miss
Hit
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