I have a problem for TUSB6020 in my DM6437EVM borad!

liang ruan

I download the stack (TUSB6020 USB OTG Driver V1.00.01 DSP/BIOS),build and run it in my DM6437evm board.TUSB6020 connected as a “B” device.PC found it as a 2 Meg RAM drive.I tested it, the max read rate is only 8MB/S,and max write rate is 3MB/s.The tusb6020 connect with a 4 tx pin and 4 rx pin, 99 MHZ VLYNQ clock,dsp run in 540MHZ. I noticed the readme file in driver stack :

Know Issues:

DMA is not functional.
Messaging needed for USB OTG Compliance Testing prints to the JTAG interface not the COM port.
Single Step Set Feature for USB HSET Testing needs to be reconfigured.

DMA is not functional in the driver stack？But i need the throughput up to 160Mbps.What should I do next? Is there anyone that has had tested the tusb6020 actual throughput in DM6437 board？

over 15 years ago

0 Wes Ray over 15 years ago

TI__Intellectual 2995 points

While the numbers you are seeing are low, it is probably about the best that can be done without DMA. I will see if I can find out if there is a stack available with DMA enabled.

0 DHarmon over 15 years ago

TI__Genius 16460 points

Liang,

One word of caution is that even if you have DMA enabled, you will not be able to achieve 160 Mb/s of throughput through the VLYNQ interface.

0 Ismael Duron10236 over 15 years ago

TI__Intellectual 2170 points

Liang,

We can provide you the instructions for enabling DMA in that stack. However, as Dan Harmon stated, 160Mbps of throughput won't be achieved even with this feature.

For your reference, attached is a chart showing the actual throughput we have measured in our lab.

Thanks and Best Regards,

Ismael

0 liang ruan over 15 years ago in reply to Ismael Duron10236

Prodigy 90 points

Ismael，Thank you for your reply

What should i do for enabling DMA in that stack? I had found of the macro definition "USBC_DMA",i had added this macro in my project bulid option.but the tusb6020 isn't work.