CYNSE70256-66BHC Cypress Semiconductor Corp, CYNSE70256-66BHC Datasheet - Page 81

• Manufacturer Part Number: CYNSE70256-66BHC
• Manufacturer: Cypress Semiconductor Corp

Specifications of CYNSE70256-66BHC

• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Package Type: BGA
• Mounting: Surface Mount
• Lead Free Status / Rohs Status: Not Compliant

10.6.7
This subsection will cover mixed searches (×72, ×144, and ×288) with tables of different widths (×72, ×144, ×288). The sample
operation shown is for a single device with CFG = 1010010100000000 that contains three tables of ×72, ×144, and ×288 widths.
The operation can be generalized to a block of 4–15 devices using four blocks; the timing and pipeline operation is the same as
described previously for fixed searches on a table of one-width size.
Figure 10-62 shows three sequential searches: first, a 72-bit Search on a ×72-configured table; a 144-bit Search on a ×144-
configured table; finally, a 288-bit Search on a ×288-configured table that each results in a hit.
Figure 10-63 shows the sample table. Two bits in each 72-bit entry will need to designated as the table number bits. One choice
can be the 00 values for the table configured as ×72, 01 values for tables configured as ×144, and 10 values for tables configured
as ×288. For the above explanation, it is further assumed that bits [71:70] for each entry will be designed as such table designation bits.
Note:
Document #: 38-02035 Rev. *E
28. The DQ[71:70] will be 00 in each of the two A and B cycles of the ×72-bit Search (Search1). DQ[71:70] is 01 in each of the A and B cycles of the ×144-bit Search
CFG = 1010010100000000,
HLAT = 010, TLSZ = 00, LRAM = 1, LDEV = 1.
(Search2). DQ[71:70] is 10 in each of the A, B, C, and D cycles of the ×288-bit Search (Search3). By having table designation bits, the CYNSE70256 device
enables the creation of many tables in a bank of NSEs of different widths.
Mixed-size Searches on Tables Configured with Different Widths Using a CYNSE70256 With CFG_L LOW
SADR[23:0]
CMD[10:2]
CMD[1:0]
CMD[2]
CLK2X
PHS_L
CMDV
ALE_L
WE_L
OE_L
CE_L
SSV
SSF
DQ
CFG = 1010010100000000
Figure 10-62. Timing Diagram for Mixed Search (One Device)
Figure 10-63. Multiwidth Configurations Example
cycle
0
1
0
0
1
1
A B A B A B C D
A B A B A B A B
1
01
D1
Search1
cycle
Search2
2
D2
01
32K
8K
4K
cycle
3
Search3
D3
cycle
01
4
72
144
cycle
5
288
cycle
6
A1
cycle
7
A2
1
0
0
0
cycle
8
Search1 Search2
x72 Hit x144 Hit
1
1
1
0
cycle
9
A3
A3
1
1
[28]
cycle
10
0
0
0
0
Search2
x288 Hit
1
1
1
1
CYNSE70256
0
0
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