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ARM9 replacing Cortex M3

Michael von Hauff
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  • 0 Arm Employee Badge
    Note: This was originally posted on 7th January 2009 at http://forums.arm.com

    ARM9 MCUs are only just starting to hit the market, but most major vendors are now starting to ship them. Googling "ARM9 microcontroller" seems to produce a lot of interesting hits, including one with a 400MHz clock speed. 

    What MCU you chose will probably depend on other factors such as RAM size, Flash size, and what IO or peripherals are available. There are normally a thousands of possible options across all of the ARM partners for this, so I can't really recommend any particular device.

    I guess the other question is DMA from what to what? RAM to RAM will possible faster than Flash to RAM, and will certainly be faster than Peripheral to RAM given slow IO speeds on most MCUs. It is also worth noting that DMA is not normally related to the core speed, but the busbandwidth and the interface type of the component being DMA'd. DMA'ing a tranfser from a fast RAM to a different location in the same RAM can be slow because it breaks up burst accesses to the memory, and non-sequential access to DRAM can be very slow.
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  • 0 Arm Employee Badge
    Note: This was originally posted on 7th January 2009 at http://forums.arm.com

    ARM9 MCUs are only just starting to hit the market, but most major vendors are now starting to ship them. Googling "ARM9 microcontroller" seems to produce a lot of interesting hits, including one with a 400MHz clock speed. 

    What MCU you chose will probably depend on other factors such as RAM size, Flash size, and what IO or peripherals are available. There are normally a thousands of possible options across all of the ARM partners for this, so I can't really recommend any particular device.

    I guess the other question is DMA from what to what? RAM to RAM will possible faster than Flash to RAM, and will certainly be faster than Peripheral to RAM given slow IO speeds on most MCUs. It is also worth noting that DMA is not normally related to the core speed, but the busbandwidth and the interface type of the component being DMA'd. DMA'ing a tranfser from a fast RAM to a different location in the same RAM can be slow because it breaks up burst accesses to the memory, and non-sequential access to DRAM can be very slow.
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