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| 型號： | CYNSE70064A-83BGC |
| 廠商： | CYPRESS SEMICONDUCTOR CORP |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | Search Engine |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PBGA272 |
| 封裝： | 27 X 27 MM, 2.33 MM HEIGHT, PLASTIC, BGA-272 |
| 文件頁數(shù)： | 47/127頁 |
| 文件大小： | 3275K |
| 代理商： | CYNSE70064A-83BGC |
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CYNSE70064A
Document #: 38-02041 Rev. *E
Page 47 of 127
10.9
Figure 10-27
shows the timing diagram for a Search command in the 136-bit-configured table (CFG = 01010101) 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
.
136-bit Search on Tables Configured as ×136 Using a Single CYNSE70064A Device
The following is the operation sequence for a single 136-bit Search command (also refer to “Command and Command Param-
eters,” Subsection 10.2 on page 18).
Cycle A
: The host ASIC drives the 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[8:7] signals must be driven with
the same bits that will be driven on SADR[21:20] 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 the CMDV HIGH and applies the command code of Search command (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
1
CLK2X
CMDV
CMD[1:0]
CE_L
OE_L
Hit
Hit
Miss
Miss
CMD[8:2]
Search2
Search4
WE_L
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
SearcSearSearcSearch4
A1
A3
01
01
01
01
Search1
Search3
A B A B A B A B
0
1
0
0
1
1
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
D1
D2
DQ
D3
D4
Figure 10-27. Timing Diagram for 136-bit Search (One Device)
LHO[0]
6
5
4
3
2
1
0
LHI
LHO[1]
BHI[2:0]
DQ[67:0]
CMDV, CMD[8:0]
SSF, SSV
SRAM
CYNSE70064A
BHO[2:0]
Figure 10-28. Hardware Diagram for a Table with One Device
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