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What is the performance difference between internal SRAM and external SDRAM in RT1050?

Question asked by YongJin Choi on Nov 27, 2018
Latest reply on Nov 28, 2018 by jeremyzhou

I'm trying to transfer data using FlexIO2

 

FlexIO2 and memory are connected by eDMA and FlexIO2 transfer data at 15Mbps using 16 data line and 1 clock line 

I set SEMC clock to 150MHz

 

When I transfer 384Kbyte with internal SRAM, it takes about 14ms

But when I transfer 384Kbyte with external SDRAM, it takes about 36ms.

 

Is it the correct performance difference between internal SRAM and external SDRAM ?

Is there any way to improve performace with external SDRAM?

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