i.MX8MM Flexspi AHB Read M4 is 10x slower than A53

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i.MX8MM Flexspi AHB Read M4 is 10x slower than A53

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EthanSu
Contributor I

Hello,

      We use Flexspi to access FPGA. When A53 read 2048 bytes via AHB it used 20us , and M4 used 200us with same configuration. Is that resonable ?Is there a way to improve the performance for Flexspi AHB Reading from M4?

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Ethan

 

seems this is architecture limitation similar to  https://community.nxp.com/t5/i-MX-Processors/iMX7d-GPIO-toggle-frequency-M4-slower-than-A7/m-p/65668...

 

Best regards
igor

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