參數(shù)資料
型號(hào)： CYNSE70128
英文描述： Network Processing
中文描述： 網(wǎng)絡(luò)處理
文件頁數(shù)： 52/126頁
文件大小： 3302K
代理商： CYNSE70128
CYNSE70032
Document #: 38-02042 Rev. *E
Page 52 of 126
The following is the sequence of operation for a single 136-bit Search command (also see Subsection 12.2, “Commands and
Command Parameters” on page 19).
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 for use in this Search operation. CMD[8:6] signals must be driven with the same
bits that will be driven by this device on SADR[21:19] if it has a hit. DQ[67:0] must be driven with the 68-bit data ([135:68]) in
order 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 to apply 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 SSR index 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 68-bit data ([67:0]) compared against all
odd locations.
The host ASIC continues to drive CMDV high and to apply 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 SSR index 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 68-bit data ([67:0]) compared against all odd locations.
The logical 136-bit Search operation is shown in
Figure 13-30
. The entire table (eight devices of 136-bit entries) is compared to
a 136-bit word K (presented on the DQ bus in cycles A and B of the command) using the GMR and local mask bits. The GMR is
the 136-bit word specified by the even and odd global mask pair selected by the GMR Index in the command’s cycle A.
cycle
1
CLK2X
CMDV
CMD[1:0]
CE_L
OE_L
CMD[8:2]
Search2
Search4
cycle
2
cycle
3
cycle
4
cycle
5
cycle
6
cycle
7
cycle
8
cycle
9
cycle
10
CFG = 01010101, HLAT = 010, 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.
PHS_L
SADR[21:0]
SSF
SSV
Search1
(Miss on
this device.)
Search2
(Miss on
this device.)
Search3
(Local but not
global winner.)
Search4
(Global winner.)
01
01
01
01
Search1
Search3
A B A B A B A B
A4
0
|(LHI[6:0])
LHO[1:0]
0
z
0
0
z
0
ALE_L
WE_L
1
z
1
0
z
1
0
0
z
1
0
A B A B A B A B
D1
D2
DQ
D3
D4
Figure 13-29. Timing Diagram for 136-bit Search Device Number 7 (Last Device)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
CYNSE70128-83BGC 制造商:Cypress Semiconductor 功能描述:NETWORK SEARCH ENGINE 388BGA - Trays
CYNSE70128-83BGI 制造商:Cypress Semiconductor 功能描述:NETWORK SEARCH ENGINE 388BGA - Trays
CYNSE70129HV-200BGC 制造商:Cypress Semiconductor 功能描述:
CYNSE70131-250BBC 制造商:Cypress Semiconductor 功能描述:
CYNSE70131A-250BBC 制造商:Cypress Semiconductor 功能描述:
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