CYNSE10128-083FGCI CYPRESS [Cypress Semiconductor], CYNSE10128-083FGCI Datasheet - Page 14

• Manufacturer Part Number: CYNSE10128-083FGCI
• Manufacturer: CYPRESS [Cypress Semiconductor]

3.2
Each 72-bit entry in the device can be accessed directly through its address index. The data and mask arrays addresses are as
shown in Figure 3-3.
3.3
During a Search operation, the search data bit is masked with the corresponding global mask bit from the selected Global Mask
Register and the mask array bit before being compared to the data array entry bit to check for a match at that bit position (see
Table 3-1). The entry with a match on every bit position results in a successful Search. For example, in order for a successful
Search within a device to make the device the local winner, all 72-bit positions must generate a match for a 72-bit entry in 72-bit-
configured quadrants. The same applies to 144-bit, 288-bit, and 576-bit searches.
The on-chip priority encoder selects the first matching entry in the database that is nearest to memory address 0. An arbitration
mechanism using a cascade bus determines the global winning device among the local winning devices in a Search cycle. The
global winning device then drives the output signals. When there is no successful Search, the device designated as the last device
(Refer to Section 5.3 for more information on last device designation) will drive the output signals.
Table 3-1. Bit Position Match
Document #: 38-02069 Rev. *F
N
Global Mask Bit
N/8
72-bit configuration
Data and Mask Addressing
Successful Search and Multiple Match Arbitration
575
71
0
1
1
1
1
1
N - 1
N - 8
72
72
0
1
2
3
0
8
0
N - 7
72
1
9
Figure 3-3. Addressing the Ayama 10000 Data and Mask Arrays
Mask Array Bit
N - 6
10
72
2
N/2
576-bit configuration
X
0
1
1
1
1
144-bit configuration
143
N - 5
11
72
3
N - 2
72
0
2
4
6
N - 4
CONFIDENTIAL
12
PRELIMINARY
72
4
N - 1
72
1
3
5
7
Data Array Bit
[1]
N - 3
0
13
72
5
X
X
0
1
0
1
N - 2
14
72
6
N/4
N - 1
287
15
72
7
Search Key Bit
N - 4
72
0
4
0
288-bit configuration
X
X
0
0
1
1
N - 3
72
1
5
N = 262144 for CYNSE10512
131072 for CYNSE10256
65536 for CYNSE10128
N - 2
72
2
6
CYNSE10512
CYNSE10256
CYNSE10128
Match Result
N - 1
72
3
7
Page 14 of 153
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