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Testing and Diagnosing Comparison Faults of TCAMs with Asymmetric Cells
Nov. 2012 (vol. 61 no. 11)
pp. 1576-1587
Jin-Fu Li, Dept. of Electr. Eng., Nat. Central Univ., Jhongli, Taiwan
Ternary content addressable memory (TCAM) is a key component in various digital systems due to its fast lookup operation. Symmetric and asymmetric TCAM cells are two widely used cells for implementing a TCAM array. This paper presents several comparison fault models of TCAMs with asymmetric cells based on electrical defects. Some new comparison faults which do not exist in a TCAM with symmetric cells are found. One march-like test algorithm TAC-H is also proposed to cover the defined comparison faults. The TAC-H consists of 8N Write operations and (3N + 2B) Compare operations for an N × B-bit TCAM with Hit output only. We also propose two march-like diagnosis algorithms to identify the defined comparison faults of TCAMs with asymmetric cells. The first diagnosis algorithm DAC-H requires 5N Write operations, 3N Erase operations, and (5N + 2B) Compare operations to distinguish 100 percent comparison faults for a TCAM with Hit output only. The second diagnosis algorithm DAC-P requires 3N Write operations, 1N Erase operations, and (5N + 2B) Compare operations to distinguish 100 percent comparison faults for a TCAM with Hit and priority address encoder outputs.
Index Terms:
table lookup,content-addressable storage,fault diagnosis,erase operation,ternary content addressable memory,digital system,lookup operation,asymmetric TCAM cell,TCAM array,fault model,electrical defect,march-like test algorithm,write operation,march-like diagnosis algorithm,Fault detection,Memory management,Content management,ternary CAM,comparison fault,march test,Memory testing,diagnosis,content addressable memory (CAM)
Citation:
Jin-Fu Li, "Testing and Diagnosing Comparison Faults of TCAMs with Asymmetric Cells," IEEE Transactions on Computers, vol. 61, no. 11, pp. 1576-1587, Nov. 2012, doi:10.1109/TC.2011.196
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