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CYNSE70032 Datasheet(PDF) 26 Page - Cypress Semiconductor

Part # CYNSE70032
Description  Network Search Engine
Download  126 Pages
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Manufacturer  CYPRESS [Cypress Semiconductor]
Direct Link  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

CYNSE70032 Datasheet(HTML) 26 Page - Cypress Semiconductor

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CYNSE70032
Document #: 38-02042 Rev. *E
Page 26 of 126
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
68-bit Search on Tables Configured as ×68 Using up to Eight CYNSE70032 Devices
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.
Table 13-1. Search Latency from Instruction to SRAM Access Cycle
Number of Devices
Max Table Size
Latency in CLK Cycles
1 (TLSZ = 00)
16K × 68 bits
4
1–8 (TLSZ = 01)
128K × 68 bits
5
1–31 (TLSZ = 10)
496K × 68 bits
6
Table 13-2. Shift of SSF and SSV from SADR
HLAT
Number of CLK Cycles
000
0
001
1
010
2
011
3
100
4
101
5
110
6
111
7
Table 13-3. HIT/MISS Assumption
Search Number
1
2
3
4
Device 0
Hit
Miss
Hit
Miss
Device 1
Miss
Hit
Hit
Miss
Devices 2–6
Miss
Miss
Miss
Miss
Device 7
Miss
Miss
Hit
Hit


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