參數(shù)資料
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): 70/127頁
文件大小: 3275K
代理商: CYNSE70064A-83BGC
CYNSE70064A
Document #: 38-02041 Rev. *E
Page 70 of 127
10.12
Figure 10-49
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 10-50
.
cycle
1
2
3
4
272-bit Search on Tables Configured as 272 Using a Single CYNSE70064A Device
The following is the sequence of operation for a single 136-bit Search command (also refer to Subsection 10.2, “Commands and
Command Parameters” on page 18).
Cycle A
: The host ASIC drives the 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.
Note
. CMD[2] = 1 signals that the Search is a ×272-bit Search. CMD[8:3] in this cycle is ignored.
CLK2X
CMDV
CMD[1:0]
CE_L
OE_L
Hit
Miss
CMD[8:2]
WE_L
cycle
cycle
cycle
cycle
5
cycle
6
cycle
7
cycle
8
cycle
9
cycle
10
CFG = 10101010, HLAT = 001, TLSZ = 00, LRAM = 1, LDEV = 1.
PHS_L
SADR[21:0]
SSF
SSV
ALE_L
Search1
Search2
A1
01
01
Search1
Search2
A B A B A B A B
0
1
0
0
1
1
0
0
1
1
0
1
0
0
A B C D A B C D
D1
DQ
D2
CMD[2]
1
0
1
1
0
1
Figure 10-49. Timing Diagram for 272-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]
SRAM
CYNSE70064A
BHO[2:0]
SSF, SSV
Figure 10-50. Hardware Diagram for a Table with One Device
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