RTOS/AM4378: SPI latency 300ns

Dmitriy Vitkovskiy

Prodigy 100 points

Part Number: AM4378

Tool/software: TI-RTOS

I use:
- SMARC-T4378 from Embedian;

- CCS6.1.3.00034;

- Ti-processor-sdk-rtos-am437x-evm-03.02.00.05;

- TI-RTOS bios_6_46_01_38;

When testing SPI, a delay of 300 ns was detected.
SPI using EDMA, in Master mode, data in blocks of 16-bit

drive.google.com/open
drive.google.com/open

Why such a long delay (300 ns)? Can I remove it?

Using the register MCSPI_CH0CONF bit TURBO, Turbo is activated to maximize the throughput for multi SPI words transfer.

Now I got a latency 50 ns. Is it possible to get the best result?

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

The RTOS team have been notified. They will respond here.

0 lding over 8 years ago in reply to Biser Gatchev-XID

TI__Guru* 95265 points

Hi,

I was not able to access: drive.google.com/open, please attach the files directly to the E2E forum. I don't have much details:
- what SPI example you run on the card processors.wiki.ti.com/.../Processor_SDK_RTOS_QSPI-McSPI ?
- What was measured and how?
- SMARC-T4378 is a customer board, did you have issue reproduced on TI EVM?

Regards, Eric

0 Dmitriy Vitkovskiy over 8 years ago in reply to lding

Prodigy 100 points

McSPI.
The measurements were made by an oscilloscope.
I do not have a TI EVM.
The latest test results with a delay of 50 ns are considered acceptable for work.
The transmission of 512 blocks of 4 bytes - 364 us.
drive.google.com/open

Question:

Is it possible to fully remove delays when transmitting data over an McSPI?

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RTOS/AM4378: SPI latency 300ns