INCREASED REFRESH INTERVAL AND ENERGY EFFICIENCY IN A DRAM

摘要

Techniques described herein generally include methods and systems related to designing and operating a DRAM device that has significantly reduced refresh energy use. A method for designing a DRAM optimizes or otherwise improves the DRAM for energy efficiency based on a measured or predicted failure probability of memory cells in the DRAM. The DRAM may be configured to operate at an increased refresh interval, thereby reducing DRAM refresh energy but causing a predictable portion of the memory cells in the DRAM to leak electrical energy too quickly to retain data. The DRAM is further configured with a selected a number of spare memory cells for replacing the “leaky” memory cells, so that operation of the DRAM at the increased refresh interval may result in little or no reduction in capacity of the DRAM.

主权项

1. A method to design a memory chip, the method comprising:
determining a failure probability of a portion of a volatile memory array, the portion including a plurality of memory cells; based on the determined failure probability, determining an improved energy use and memory capacity overhead of the volatile memory array; and determining a number of spare memory cells to include in the volatile memory array based on the improved memory capacity overhead and according to a refresh interval for the volatile memory array that is based on the improved energy use.