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Buffered and non-buffered access on an ARM9 chip

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Jos Brink

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Hi there,

I'm trying to understand the ARM9 core. Can someone explain me the difference and the use of these two memory accesses. I'm reading the STR91 datasheet and i see multiple addresses for the same peripheral. What's the idea behind this?

Thank you for your time.

Micha
 

Bingo600

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The Non Buffered memory address will not reflect the correct value if you do a write immedialy followed by a read. The Buffered address will.

Due to the pipline structure.

Get the Hitec STR9 Insider book from the ST site , there is a good explanation.

/Bingo
 

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