TMS570LS1227: Parallel Mode SPI (8 Bit Data)

Andy Coetzee

Part Number: TMS570LS1227

I have been looking through the various datasheets and semm to be getting confused. I would like to transfer 8 bit data array via the 4 data lines using DMA. Now the datasheet says to use the CHARLEN value to set the length to 8 bits. But when you look at the explaination of the parallel mode and 4 pin mapping, the diagram only shows 16 bit transfer possible. Am I missing something?

Also, when looking at the DMA transfer, it looks like this is only possible when moving 16 bit data due to the DMA buffer setup. Again, am I not getting this?

I am still in the software design phase as I have not received my hardware yet, and am not able to test this.

Thanks Andy

over 5 years ago

0 QJ Wang over 5 years ago

TI__Guru**** 198546 points

Hi Andy,

There is no problem for MibSPI and DMA to transfer 8-bit data array: MibSPI charlen=8-bit, and DMA read/write element size = 8-bit.

0 Andy Coetzee over 5 years ago in reply to QJ Wang

Intellectual 270 points

Thanks for the reply. I get that, but the question is maybe more towards will the 4 data lines work with 8-bit data.

I think I have figured it out, in 8-bit, the top 2 data lines will be 0, so only 2 active data lines. In 16 bit data length, then all 4 data lines will be used.

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TMS570LS1227: Parallel Mode SPI (8 Bit Data)