TMS320F28377S: 16b asynchronous memory interface with the address bus connected as 32b and using only 16b data

Gabriela Teodorine

Part Number: TMS320F28377S

I have a hardware design with F28377S and a 16b memory interface that is not connected according with TI recommendations with EM1BA[1] to memory A[0], and actually the connections for the address bus is EM1A[19:0] to memory A[19:0]. From DSP specs, this is the way to connect a 32b memory, not a 16b one and according with this I will be able to access 16 bit data from every other address location.. Also as mentioned above, only lower 16b data are connected.

Considering the hardware, would it be any work around in software/settings that will allow me using the memory to store program or data code, even if I have to use only half of the memory space?

Thanks!

over 6 years ago

0 Vivek Singh over 6 years ago

TI__Guru** 115631 points

Gabriela,

I am not aware of any SW settings which can prevent compiler to generate 32bit access. I can check with our complier team but even if it's available, it'll impact the performance badly not just for external memory access but for overall application hence I would suggest to fix the HW in this case.

Regards,

Vivek Singh

0 Gabriela Teodorine over 6 years ago in reply to Vivek Singh

Prodigy 110 points

Vivek, thanks for getting back to me and let me know if something will be available. We will fix the board on the next revision.

Thanks!

0 Vivek Singh over 6 years ago in reply to Gabriela Teodorine

TI__Guru** 115631 points

I checked few experts and don't see any compiler option for this. If you are just doing read/write then you can write code in assembly to restrict the same but fixing the board will be the best option.

Regards,

Vivek Singh

C2000™︎ microcontrollers

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TMS320F28377S: 16b asynchronous memory interface with the address bus connected as 32b and using only 16b data