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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)： | 76/127頁 |
| 文件大?。?/td> | 3275K |
| 代理商： | CYNSE70064A-83BGC |
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CYNSE70064A
Document #: 38-02041 Rev. *E
Page 76 of 127
The following is the sequence of operation for a single 272-bit Search command (also See “Commands and Command Param-
eters” 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 in this operation.
DQ[67:0] must be driven with the 68-bit data ([271:204]) to be compared against all locations 0 in the four-word 68-bit 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.
Cycle B
: The host ASIC continues to drive the CMDV HIGH and applies Search command code (10) on CMD[1:0]. The
DQ[67:0] is driven with the 68-bit data ([203:136]) to be compared against all locations 1 in the four 68-bits-word page.
Cycle C
: 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 [135:0] of the data being searched. CMD[8:7] signals must
be driven with the 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 locations 2 in the four 68-bits-word page. The CMD[2] signal must be driven to logic 0.
Cycle D
: The host ASIC continues to drive the CMDV HIGH and applies Search command code (10) on CMD[1:0]. 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 the hit flag
(see page 14 for the description of SSR[0:7]). The DQ[67:0] is driven with the 68-bit data ([67:0]) to be compared to all locations 3
in the four 68-bits-word page. CMD[5:2] is ignored because the Learn instruction is not supported for x272 tables.
Note
. For 272-bit searches, the host ASIC must supply four distinct 68-bit data words on DQ[67:0] during cycles A, B, C, and D.
The GMR index in cycle A selects a pair of GMRs in each of the eight devices that apply to DQ data in cycles A and B. The GMR
index in cycle C selects a pair of GMRs in each of the eight devices that apply to DQ data in cycles C and D.
The logical 272-bit Search operation is shown in
Figure 10-56
. The entire table of 272-bit entries is compared to a 272-bit word
K that is presented on the DQ bus in cycles A, B, C, and D of the command using the GMR and the local mask bits. The GMR is
the 272-bit word specified by the two pairs of GMRs selected by the GMR Indexes in the command’s cycles A and C in each of
the eight devices. The 272-bit word K that is presented on the DQ bus in cycles A, B, C, and D of the command is compared to
cycle
1
CLK2X
PHS_L
CMDV
CE_L
OE_L
on this
device.)
cycle
2
cycle
3
cycle
4
cycle
5
cycle
6
cycle
7
cycle
8
cycle
9
cycle
10
CFG = 10101010, HLAT = 000, TLSZ = 01, LRAM = 1, LDEV = 1.
Note: |(LHI[6:0]) stands for the boolean ‘OR’ of the entire bus LHI[6:0].
Note: Each bit in LHO[1:0] is the same logical signal.
SADR[21:0]
SSF
SSV
(Miss
Search2 Search3
(Miss
on this
device.)
0
(Global
miss.)
|(LHI[6:0])
LHO[1:0]
0
z
0
ALE_L
WE_L
1
z
1
0
z
1
0
0
z
0
CMD[1:0]
CMD[8:2]
01
01
Search1
Search2
A B A B A B A B
CMD[2]
A B C D A B C D
D1
DQ
D2
A B C D
D3
A B A B
01
Search3
z
0
0
z
z
1
z
z
0
0
z
0
Figure 10-55. Timing Diagram for 272-bit Search Device Number 7 (Last Device)
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