IP개요 |
Ternary Content Addressable Memory (TCAM) is a hardware storage that can be accessed by contents rather than physical address. Although static TCAM is commonly used in fast lookup based on parallel search feature, it costs large area. Dynamic TCAM (DTCAM), which can be a solution for area overhead, also has problem that charges of its storage nodes is damaged over time due to cell leakage current. The damaged charges make DTCAM search speed lower, which is terrible disadvantage of DTCAM. This paper proposes a 5T DTCAM to achieve high search speed and long retention time. Using a cadence tool, simulations of the conventional and proposed DTCAMs were performed to compare their performance. The retention time was also increased allowing the refresh period of proposed DTCAM to be extended. The DTCAM macros which have identical array sizes, 4 Kb (128 entries × 32 bits) are designed in a 65-nm CMOS technology. Simulations were executed at 1 V supply voltage and 100 MHz operating frequency. |