No abstract

No abstract

No abstract

No abstract

Many big-data (BD) processors reduce power consumption by employing ternary content-addressable-memory (TCAM) [1-2] with pre-stored signature patterns as filters to reduce the amount of data sent for processing in the following stage (i.e., wireless transmission). To further reduce standby power, BD-processors commonly use nonvolatile memory (NVM) to back up the signature patterns of SRAM-based TCAM (sTCAM) [3] during power interruptions or frequent-off operations. However, this 2-macro (sTCAM + NVM) scheme suffers long delays and requires considerable energy for wake-up operations, due to the word-by-word serial transfer of data between NVM and TCAM macros. Most of the signature patterns are seldom updated (written); therefore, single-macro nonvolatile TCAM (nvTCAM) can be used for BDprocessors to reduce area and facilitate fast/low-power wake-up operations, compared to the 2-macro approach. Previous nvTCAMs were designed using diode-connected 4T2R with STT-MTJ (D4T2R) [4], 2T2R with PCM [5], and 4T2R with ReRAM [2]; however, they suffer the following issues: (1) large cell area (A) and high write energy (E W ) due to the use of two NVM (2R) devices;(2) limited word-length (WDL, k-bits) caused by small current-ratio (I-ratio=I ML-MIS I(k×l ML-M )) between match-line (ML) mismatch current (I ML-MIS ) and ML leakage current of k matched cells (k×I ML-M ); (3) Long search delays (T SD ) and excessive search energy (E S ) due to large ML parasitic load (C ML ) and small I-ratio. ReRAM is promising for nvTCAM due to its low E W , high resistance-ratio (R-ratio), and multiple-level cell (MLC) capability. To overcome issue (1) to (3), this study develops an MLC-based 3T1R nvTCAM with bi-directional voltage-divider control (BVDC). A 2×64×64b 3T1R nvTCAM macro is fabricated using back-end-of-line (BEOL) ReRAM [6] and a 90nm CMOS process, with 2.27× cell size reduction as compared with sTCAM using the same technology and the T SD (=0.96ns) for WDL=64b.978-1-4799-6224-2/15/$31.00 ©2015 IEEE