Device and method for refreshing DRAM (dynamic random access memory) or eDRAM(enhanced dynamic random access memory)

Abstract

The present invention relates to a device and a refresh method for DRAM or eDRAM refresh, which are used to perform a refresh operation within the data retention time of each database of DRAM or eDRAM, comprising: a refresh control device, which is used to control the refresh cycle to be less than the data Keeping time, and controlling whether to generate a refresh signal: a memory control device, which receives a read-write request, and sends a read-write request or a refresh command to the memory according to the signal generated by the refresh control device; wherein, the memory control device is sending to the memory After the memory sends a refresh request, if a read / write request is received during the refresh execution process, the memory control device asks the refresh control device whether to interrupt the refresh and execute the read / write operation, and the refresh control device generates a signal to suspend refresh under predetermined conditions. The invention can solve the problem that reading and writing cannot be performed during refreshing, thereby improving the performance effect of DRAM or eDRAM.

Description

technical field [0001] The invention relates to a refresh circuit, in particular to a device and a refresh method for DRAM or eDRAM refresh. Background technique [0002] DRAM (Dynamic Random Access Memory), that is, dynamic random access memory, is the most common system memory. DRAM can only hold data for a short time. In order to keep data, DRAM uses capacitor storage, so it must be refreshed once in a while. If the storage unit is not refreshed, the stored information will be lost. Since DRAM is manufactured by MOS technology, capacitors are used as memory cells. DRAM has low power consumption and is slow. On the other hand, static random access memory (SRAM) is fast and does not need to be refreshed, however, the area of ​​static random access memory (SRAM) is too large and more expensive, so DRAM is more widely used than SRAM. [0003] Static Random Access Memory (SRAM) uses flip-flops to store information, while DRAM uses capacitors to store information. But the ...

AI Technical Summary

Problems solved by technology

When DRAM is being refreshed, read and write operations cannot be performed. This period of time is called dead time, which reduces the amount of DRAM read and write and increases the delay time of read and write.

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