cynse70032 Cypress Semiconductor Corporation., cynse70032 Datasheet - Page 89

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

The following is the sequence of operation for a single 272-bit Search command (also refer to Subsection 12.2, “Commands and
Command Parameters” on page 19).
Document #: 38-02042 Rev. *E
CFG = 10101010, HLAT = 000, 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 applies Search command (10) on CMD[1:0]. The DQ[67:0] is
• Cycle C: The host ASIC drives CMDV high and applies Search command code (10) on CMD[1:0] signals. CMD[5:3] signals
must be driven with the index to the GMR pair used for bits[271:136] of the data being searched. DQ[67:0] must be driven with
the 68-bit data ([271:204]) to be compared to all locations 0 in the four 68-bits-word page. The CMD[2] signal must be driven
to logic 1.
driven with the 68-bit data ([203:136]) to be compared to all locations 1 in the four 68-bits-word page.
must be driven with the index to the GMR pair used for the bits [135:0] of the data being searched. CMD[8:6] signals must be
driven with the bits that will be driven by this device on SADR[21:19] if it has a hit. DQ[67:0] must be driven with the 68-bit data
([135:68]) to be compared to all locations 2 in the four 68-bits-word page. The CMD[2] signal must be driven to logic 0.
SADR[21:0]
I(BHI[2:0])
|(LHI[6:0)]
CMD[1:0]
CMD[8:2]
Note
BHO[2:0]
LHO[1:0]
Figure 13-65. Timing Diagram of the Last Device in Block Number 3 (Device 30 in the Table)
CMD[2]
CLK2X
PHS_L
ALE_L
CMDV
WE_L
OE_L
CE_L
. CMD[2] = 1 signals that the search is a x272-bit Search. CMD[8:6] is ignored in this cycle.
SSV
SSF
DQ
0
0
0
0
0
0
1
0
0
0
cycle
A B A B A B A B
A B C D A B C D
1
Search1
cycle
01
D1
2
cycle
3
Search2
D2
cycle
01
4
cycle
A B A B
A B C D
5
Search3
D3
cycle
01
6
cycle
(Hit on some
device above.)
7
Search1
cycle
8
z
z
z
z
z
z
cycle
(Hit on some
device above.)
9
0
0
0
1
0
Search2
cycle
10
z
z
z
z
z
z
1
0
0
0
0
(Hit on some
device above.)
Search3
CYNSE70032
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