TMS570LS3137: EMIF interfacing

Rohini Chavan

Hello,

I am using Eval board (TMS570LS31X HDK)

In trying to map the external flash address 0x60E00000 in sys_link.cmd to a section called .maintdtbl. Then fixing this section for one array in my code using

#pragma DATA_SECTION(variable_name, ".maintdtbl")

int variable_name[128];

When I assign some values to some elements in the array, they are not reflected. I called emif_ASYNC2Init() too. Am I missing any other setting ?

Regards,

Rohini

over 3 years ago

0 jagadish gundavarapu over 3 years ago

TI__Guru* 77636 points

Hi Rohini,

Can you disclose the details of type and size of external flash you are connected?
And i also would like to know the which chip select of EMIF connected to the external flash?

Thanks,
Jagadish.

0 Rohini Chavan over 3 years ago in reply to jagadish gundavarapu

Prodigy 120 points

It is connected to 64Mb SDRAM(IS45S16400F) and CS0 of EMIF is connected to external flash.

Regards,

Rohini

0 Chester Gillon over 3 years ago

Guru 92251 points

Rohini Chavan said:
When I assign some values to some elements in the array, they are not reflected.

What type of external flash is used?

To update variables in an external flash your program will have to perform an erase/program sequence rather than simply writing to the array.

0 jagadish gundavarapu over 3 years ago

TI__Guru* 77636 points

Hi Rohini Chavan,

You can not map address 0x60E00000 because this is not the correct address range for SDRAM, if you see the below screenshot there you can see that SDRAM address range will be starting from 0x80000000

I am attaching one PDF related to SDRAM example, please go through it. In this example we are running some part of the code in SDRAM instead of flash, you can just refer and understand.

example_emif_SDRAM.pdf--

Thanks,

Jagadish.

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TMS570LS3137: EMIF interfacing