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

[yongjin2712_cho]

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?

[jeremyzhou]

Hi YongJin Choi,
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
1）Is it the correct performance difference between internal SRAM and external SDRAM?
-- The difference between the SRAM and SDRAM's performance is normal.
2) Is there any way to improve performance with external SDRAM?

• SDRAM write performance is good under of DCACHE disable, however, SDRAM read performance increase by 5 times after enabling DCACHE.
• Better performance on SDRAM write than read, as write operation is pipelined.
• To balance read and write performance, as well as practices application, recommend to enable CACHE in most case.

Have a great day,
TIC

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