cynse70032 Cypress Semiconductor Corporation., cynse70032 Datasheet - Page 46

• Manufacturer Part Number: cynse70032
• Description: Network Search Engine
• Manufacturer: Cypress Semiconductor Corporation.

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).
Document #: 38-02042 Rev. *E
CFG = 01010101, HLAT = 001, TLSZ = 00, LRAM = 1, LDEV = 1.
• Cycle A: The host ASIC drives CMDV high and applies Search command code (10) to CMD[1:0] signals. CMD[5:3] signals
• Cycle B: The host ASIC continues to drive CMDV high and applies Search command code (10) on CMD[1:0]. CMD[5:2] must
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.
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.
DQ[67:0]
CMDV, CMD[8:0]
SADR[21:0]
CMD[1:0]
CMD[8:2]
CLK2X
PHS_L
ALE_L
CMDV
SSF, SSV
WE_L
CE_L
OE_L
SSV
SSF
DQ
Figure 13-23. Timing Diagram for 136-bit Search (One Device)
Figure 13-24. Hardware Diagram for a Table With One Device
BHI[2:0]
BHI[2:0]
1
1
1
0
0
0
cycle
Search1
A B A B A B A B
A B A B A B A B
1
01
D1
cycle
Search2
2
01
LHO[1]
D2
cycle
Search3
3
01
CYNSE70032
D3
cycle
Search4
4
01
D4
6
cycle
5
A1
0
1
0
0
5
cycle
Search1
6
Hit
1
4
1
1
1
1
0
LHI
cycle
Search2
7
3
Miss
A3
0
0
0
1
0
Search3
2
cycle
Hit
8
1
1
Search4
cycle
LHO[0]
Miss
9
1
1
1
0
0
0
cycle
10
0
SRAM
CYNSE70032
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