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FlexSPI IP FIFO filling very slow

Question asked by Matthias Pimminger on May 28, 2020
Latest reply on Jun 18, 2020 by Victor Jimenez

Hi all,

we fill the IP TX FIFO with 32x4 Byte Data by IP Bus to transmit Data via FlexSPI. So, on each transfer we fill the FIFO with 128 Byte Data. Unfortunately, the filing of the FIFO is very slow. Those transfer is measured with Oscilloscope and needs about 2us.

For us it is not logical that the FIFO transfer is so slow because the IP Bus is running with 132MHz.

How can we improve the FIFO filling speed?

Is the Bottleneck the AHB to IP Bridge (AIPSTZ) clock (aips_tz3_hclk)?

 

I am really looking forward to your answer.

BR

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