Implement RWW on i.MX RT Series
■Usually, some applications need to store the data to flash, and run code simultaneously that requires Read While Write(RWW). The i.MX RT has high-performance, supports rich peripherals, and can interface with many memory devices including Quad SPI flash, hyper flash, serial NAND, and parallel NAND flash. It also provides more options to meet customer requirements. This application note intends to introduce how to implement RWW requirement on i.MXRT series.
●Overview:
■To implement RWW, the flash support feature is required in nature, but most flash do not have this feature. One way to implement RWW is based on common flash device, which is described in this document.
■i.MX RT is a flash-less microcontroller, Quad SPI flash is a common selection as firmware storage, also some application may save data in this flash, but it only has one flash bank and interface. One limitation is it do not respond to any further command until flash idle, that means it must allocate the flash write function to other memory(except currently writing flash, generally allocate to internal SRAM), and disable interrupt to avoid any unexpected flash access until writing operation complete. As write operation spend more time in most flash devices, for example, it takes 0.4 mS to complete one page program in most flash part, and take more time on sector erase. This is unacceptable to disable interrupt lasting a long time, especially some interrupt require high-timely response, RWW is helpful in this condition.
■There are two solutions to implement RWW on i.MX RT Series, one is to choose the flash supported RWW feature; the other is to use multiple flash to implement this function. Following chapters describe the RWW implementation in detail.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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Septeber 2019 |
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Rev. 0 |
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AN12564 |
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365 KB |
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