cynse70032 Cypress Semiconductor Corporation., cynse70032 Datasheet - Page 67

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

The following is the sequence of operation for a single 136-bit Search command (also refer to “Command and Command
Parameters,” Subsection 12.2 on page 19).
Document #: 38-02042 Rev. *E
CFG = 01010101, HLAT = 001, TLSZ = 10, LRAM = 1, LDEV = 1.
Note: |(BHI[2:0)] stands for the boolean ‘OR’ of the entire bus BHI[2:0].
Note: |(LHI[6:0]) stands for the boolean ‘OR’ for the entire bus LHI[6:0].
Note: Each bit in BHO[2:0] is the same logical signal.
Note: Each bit in LHO[1:0] is the same logical signal.
• Cycle A: The host ASIC drives CMDV high and applies Search command code (10) on CMD[1:0] signals. CMD[5:3] signals
• Cycle B: The host ASIC continues to drive CMDV high and to apply 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 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]) in order
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
SADR[21:0]
I(BHI[2:0])
|(LHI[6:0])
CMD[1:0]
CMD[8:2]
BHO[2:0]
LHO[1:0]
CLK2X
PHS_L
ALE_L
CMDV
WE_L
CE_L
OE_L
SSV
SSF
DQ
Figure 13-43. Timing Diagram for Device Number 6 in Block Number 3
0
0
0
0
0
0
1
0
0
0
(Device Number 30 in Depth-Cascaded Table)
cycle
Search1
A B A B A B A B
1
A B A B A B A B
01
D1
cycle
Search2
2
01
D2
cycle
Search3
3
01
D3
cycle
4
Search4
01
D4
cycle
5
cycle
6
cycle
(Hit on some
device above.)
7
Search1
(Hit on some
device above.)
cycle
8
z
z
z
z
Search2
cycle
(Hit on some
device above.)
9
z
z
Search3
cycle
10
Search4
(Global miss;
this device is
default driver.)
1
0
0
1
0
CYNSE70032
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