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CYNSE70032 Datasheet(PDF) 46 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) 46 Page - Cypress Semiconductor

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CYNSE70032
Document #: 38-02042 Rev. *E
Page 46 of 126
The following is the operation sequence for a single 136-bit Search command (also refer to “Command and Command Param-
eters,” Subsection 12.2 on page 19).
• Cycle A: The host ASIC drives CMDV high and applies Search command code (10) to CMD[1:0] signals. CMD[5:3] signals
must be driven with the index to the GMR pair for use in this Search operation. CMD[8:6] signals must be driven with the same
bits that will be driven on SADR[21:19] by this device if it has a hit. DQ[67:0] must be driven with the 68-bit data ([135:68]) to
be compared against all even locations. The CMD[2] signal must be driven to logic 0.
• Cycle B: The host ASIC continues to drive CMDV high and applies Search command code (10) on CMD[1:0]. CMD[5:2] must
be driven by the index of the comparand register pair for storing the 136-bit word presented on the DQ bus during cycles A
and B. CMD[8:6] signals must be driven with the index of the SSR that will be used for storing the address of the matching
entry and hit flag (see page 14 for the description of SSR[0:7]). The DQ[67:0] is driven with 68-bit data ([67:0]), compared to
all odd locations.
cycle
CLK2X
CMDV
CMD[1:0]
CE_L
OE_L
Hit
Hit
Miss
Miss
CMD[8:2]
Search2
Search4
WE_L
1
cycle
2
cycle
3
cycle
4
cycle
5
cycle
6
cycle
7
cycle
8
cycle
9
cycle
10
CFG = 01010101, HLAT = 001, TLSZ = 00, LRAM = 1, LDEV = 1.
PHS_L
SADR[21:0]
SSF
SSV
ALE_L
Search1
Search2
Search3
Search4
A1
A3
01
01
01
01
Search1
Search3
A B A B A B A B
0
1
0
0
1
1
0
1
1
0
0
0
1
0
1
1
0
1
1
0
0
0
1
0
0
1
1
1
A B A B A B A B
DQ
D1
D2
D3
D4
Figure 13-23. Timing Diagram for 136-bit Search (One Device)
LHO[0]
65
4321
0
LHI
LHO[1]
BHI[2:0]
DQ[67:0]
SRAM
CYNSE70032
CMDV, CMD[8:0]
BHI[2:0]
SSF, SSV
Figure 13-24. Hardware Diagram for a Table With One Device


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