cynse70032 Cypress Semiconductor Corporation., cynse70032 Datasheet - Page 69

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

13.7
Figure 13-45 shows the timing diagram for a Search command in the 272-bit-configured table (CFG = 10101010) consisting of
a single device for one set of parameters: TLSZ = 00, HLAT = 001, LRAM = 1, and LDEV = 1. The hardware diagram for this
search subsystem is shown in Figure 13-46.
The following is the sequence of operation for a single 136-bit Search command (also refer to Subsection 12.2, “Commands and
Command Parameters” on page 19).
Document #: 38-02042 Rev. *E
CFG = 10101010, HLAT = 001, TLSZ = 00, LRAM = 1, LDEV = 1.
• Cycle A: 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.
272-bit Search on Tables Configured as ×272 using a Single CYNSE70032 Device
DQ[67:0]
CMDV, CMD[8:0]
SADR[21:0]
CMD[1:0]
CMD[8:2]
SSF, SSV
CMD[2]
Note
CLK2X
PHS_L
ALE_L
CMDV
WE_L
OE_L
CE_L
SSV
SSF
DQ
. CMD[2] = 1 signals that the search is a x272-bit search. CMD[8:3] in this cycle is ignored.
Figure 13-46. Hardware Diagram for a Table With One Device
Figure 13-45. Timing Diagram for 272-bit Search (One Device)
BHI[2:0]
BHI[2:0]
1
0
0
0
1
1
cycle
A B A B A B A B
A B C D A B C D
1
Search1
01
cycle
D1
LHO[1]
2
cycle
3
CYNSE70032
Search2
D2
cycle
01
4
6
cycle
5
5
cycle
6
4
A1
1
0
0
0
LHI
cycle
3
Search1
7
Hit
1
1
1
1
1
0
2
cycle
8
1
0
LHO[0]
Search2
cycle
Miss
9
0
0
1
cycle
10
0
SRAM
CYNSE70032
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