FRAM (ferroelectric random access memory) unit connected with DSP (serial peripheral interface) by adopting SPI (serial peripheral interface) as interface

Abstract

The invention provides an FRAM (ferroelectric random access memory) unit connected with a DSP (serial peripheral interface) by adopting an SPI (serial peripheral interface) as an interface. The FRAM unit comprises the DSP, the SPI and FRAMs, wherein the SPI is taken as a medium of the DSP and the FRAMs, a port MISO of the SPI is connected with a port MCBSP of the DSP, a port MOSI of the SPI is connected with a port SO of each FRAM, a serial clock line SCLK of the SPI is connected with a clock signal SCK on each FRAM, a chip select signal / SS of the SPI is connected with a chip select signal / CS on each FRAM, multiple FRAMs can be connected to the outside of the SPI in parallel, and the model of each FRAM is FM25H20. The FRAM unit is connected with the DSP by adopting the SPI as the interface, so that not only is I / O (input / output) space of the DSP saved, but also the read-write speed of the DSP on a nonvolatile memory is greatly increased.

Description

technical field [0001] The invention belongs to the field of DSP digital signal processing systems, and in particular relates to a FRAM connected with DSP by using SPI as an interface. Background technique [0002] Digital signal processing is a technical discipline that studies the analysis, transformation, filtering, detection, modulation, demodulation and fast algorithm of signals by digital methods. During this process, some non-volatile storage media is needed to save the data. [0003] Traditional methods are mostly (such as Figure 1 As shown) Connect NORFLASH to the EMIF port to store these data. It is well known that the read and write speed of NORFLASH is very slow; or (such as Figure II As shown) connect parallel FRAM externally to the EMIF port. Although this method effectively solves the problem of read and write speed, the EMIF interface of most DSPs is very tight. Contents of the invention [0004] In view of this, the present invention aims to propose a ...

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Problems solved by technology

[0003] Traditional methods are mostly (such as Figure 1 As shown) Connect NORFLASH to the EMIF port to store these data. It is well known that the read and write speed of NORFLASH is very slow; or (such as Figure II As shown) connect parallel FRAM to the EMIF port. Although this method effectively solves the problem of read and write speed, most DSP EMIF interfaces are very tight.

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