Frequency conversion method of dynamic random access memory (DRAM)
A dynamic random access, memory technology, applied in static memory, digital memory information, information storage and other directions, can solve the problem of external equipment acquiring wrong data, etc., to improve the user experience.
Active Publication Date: 2013-09-11
ANYKA (GUANGZHOU) MICROELECTRONICS TECH CO LTD
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[0005] In view of this, the purpose of the present invention is to provide a DRAM frequency conversion method, which can solve the problem that external devices will obtain wrong data during the DRAM frequency conversion process, thereby improving user experience
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[0019] Explain the English abbreviations or technical terms that appear below.
[0020] DRAM, Dynamic Random Access Memory, dynamic random access memory;
[0021] DDR, namely DDR SDRAM, double rate synchronous dynamic random access memory;
[0022] DDR2, the second generation of DDR SDRAM;
[0023] DDR3, the third generation of DDR SDRAM;
[0024] SRAM, Static Random Access Memory, static random access memory;
[0025] PSRAM, pseudo static random access memory;
[0026] SDRAM, synchronous dynamic random access memory;
[0027] PLL, Phase Locked Loop or Phase Locked Loop.
[0028] The applicant of the present invention has found through long-term research that during the DRAM frequency conversion process, it will stop responding to the access request sent by the microprocessor. At this time, if the external device sends an instruction to request new data to the microprocessor, the microprocessor will send an instruction to the DRAM Access request, although the DRAM in the...
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The invention discloses a frequency conversion method of a dynamic random access memory (DRAM). The frequency conversion method comprises the following steps: freezing external equipment related to the DRAM, and prohibiting the external equipment from outputting a new data request command; controlling the DRAM to enter a power saving mode or automatically refresh; copying a first frequency conversion code to a preset buffer area; operating the first frequency conversion code, and controlling a phase-locked loop to adjust the clock frequency of the DRAM to a preset frequency; controlling the DRAM to log out from the power saving mode or stop automatically refreshing; defreezing the external equipment, and allowing the external equipment to output the new data request command. On the basis of the frequency conversion method disclosed by the invention, a microprocessor can not send an access request to the DRAM in the frequency conversion process of the DRAM so as to prevent the microprocessor from obtaining wrong data from the DRAM, and cached effective data are transmitted to the external equipment to prevent the external equipment from obtaining the wrong data in the frequency conversion process of the DRAM, thus improving the user experience.
Description
technical field [0001] The invention belongs to the technical field of dynamic random access memory, in particular to a frequency conversion method of dynamic random access memory (DRAM). Background technique [0002] With the development of embedded electronic products, the current microprocessor can already run higher main frequency, for example, arm-context a9 can already reach the main frequency of 1.2Ghz, which meets the needs of the embedded intelligent operating system and realizes intelligent Various application requirements of the operating system. Based on the large memory requirements of the operating system and cost considerations, the current market generally chooses DRAM as the system memory. For example, DDR (Double Rate Synchronous Dynamic Random Access Memory), DDR2 and DDR3, which are fast and low-cost, are used as system memory. [0003] A phase-locked loop (PLL) can provide clock signals of different frequencies for the microprocessor, memory and periph...
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Inventor 操冬华胡胜发
Owner ANYKA (GUANGZHOU) MICROELECTRONICS TECH CO LTD