參數資料
型號: CYNSE70256
英文描述: Network Processing
中文描述: 網絡處理
文件頁數: 46/126頁
文件大?。?/td> 3302K
代理商: CYNSE70256
CYNSE70032
Document #: 38-02042 Rev. *E
Page 46 of 126
The following is the operation sequence for a single 136-bit Search command (also refer to “Command and Command Param-
eters,” Subsection 12.2 on page 19).
Cycle A
: The host ASIC drives 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[8:6] signals must be driven with the same
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]) 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 CMDV high and applies Search command code (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
PHS_L
CMDV
CMD[1:0]
CE_L
OE_L
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.
Figure 13-23. Timing Diagram for 136-bit Search (One Device)
SADR[21:0]
SSF
SSV
ALE_L
Search1
Search2
SHit
Search4
A1
A3
01
01
01
01
Search1
Search3
A B A B A B A B
0
1
0
0
1
1
0
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
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
CYNSE70032
BHI[2:0]
Figure 13-24. Hardware Diagram for a Table With One Device
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