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): 53/127頁
文件大?。?/td> 3275K
代理商: CYNSE70064A-83BGC
CYNSE70064A
Document #: 38-02041 Rev. *E
Page 53 of 127
The following is the sequence of operation for a single 136-bit Search command (also see Subsection 10.2, “Commands and
Command Parameters” on page 18).
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[8:7] signals must be driven with the same
bits that will be driven by this device on SADR[21:20] 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 a logic 0.
Cycle B
: The host ASIC continues to drive CMDV HIGH and to apply the command code for 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 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.
cycle
1
CLK2X
CMDV
CMD[1:0]
CE_L
OE_L
on this
device.)
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
(Miss
SearwinnSearch4
(Miss
on this
device.)
Search3
(Local
but not
global
(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 10-33. Timing Diagram for 136-bit Search Device Number 7 (Last Device)
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