Multiple TDA4 cascaded through PCIE

bing hu

Prodigy 240 points

hi,

we want to make Multiple TDA4 cascaded through PCIE。

（1）Does tda4 support pcie driver configuration as master and slave？

（2）How to configure TDA4 as master and slave？

（3）Is it related to demo or example code?

over 5 years ago

0 jian35385 over 5 years ago

TI__Mastermind 23125 points

Bing,

TDA4 support simultaneous 4 ports, each port can support up to 2 Lane Gen 3 PCIe ports. Each port can be independently configured as Root Complex (RC) or End Point (EP), and 4 ports can be used as a switch.

There may be different topologies to interconnect multiple devices. one example may be to use the multiple function end-point configuration as a PCIe Backplane example. You can see the details of the example in our SDK, at:

https://software-dl.ti.com/jacinto7/esd/processor-sdk-linux-jacinto7/07_00_00_04/exports/docs/linux/Foundational_Components/Kernel/Kernel_Drivers/PCIe/PCIe_Backplane.html

I also attached a top level diagram for quick reference.

regards

Jian

../../../../../_images/j7-linux-pcie-backplane.png

0 bing hu over 5 years ago in reply to jian35385

Prodigy 240 points

hi Jian

Thank you very much for your reply!

I maybe understand what you mean,and in our project, we want to link TDA4 with an industrial computer with PCIe, and then transfer the data collected by TDA4 to the industrial computer through PCIe?

If this is the case, I need to configure TDA4 to RC mode and configure industrial computer to EP mode, right?

thanks!!!

0 jian35385 over 5 years ago in reply to bing hu

TI__Mastermind 23125 points

Bing,

Data transfer can happen both directions, so it is mandatory for TDA4 to be the RC. Additionally, TDA4 can write sensor data it collected to the Industrial PC via its own DMA, even it acts as EP.

For example, you can configure the PC as the RC, and TDA4 as the EP. Then EP can DMA sensor data directly to the PC's internal memory.

let me know if this helps

jian

0 bing hu over 5 years ago in reply to jian35385

Prodigy 240 points

Jian,

thank you very much for your reply

"For example, you can configure the PC as the RC, and TDA4 as the EP. Then EP can DMA sensor data directly to the PC's internal memory."

If this configuration means:

1.industrial PC is Master device, and TDA4 is slave device?

2.TDA4's DMA is responsible for transferring data from TDA4 DDR to industrial PC DDR, and the industrial PC side does not require DMA participation?

And there is still a little confusion: For example, if I want to realize that device A sends data and device B receives data through the PCIe bus, does it mean that device A is a slave device and needs to be configured as EP, and device B is a master device and needs to be configured as RC, right?

hubing

0 bing hu over 5 years ago in reply to bing hu

Prodigy 240 points

Jian,

Is there a demo for this case?

“For example, you can configure the PC as the RC, and TDA4 as the EP. Then EP can DMA sensor data directly to the PC's internal memory.”

thanks

hubing

0 jian35385 over 5 years ago in reply to bing hu

TI__Mastermind 23125 points

yes Bing, you can see at:

http://software-dl.ti.com/jacinto7/esd/processor-sdk-linux-jacinto7/latest/exports/docs/linux/Foundational_Components/Kernel/Kernel_Drivers/PCIe/PCIe_End_Point.html

it is a standard PCIe EP driver example.

regards

Jian

0 bing hu over 5 years ago in reply to bing hu

Prodigy 240 points

Jian,

Is the information in this reply correct? as follows:

"-----------------------------------------------------"

Jian,

thank you very much for your reply

"For example, you can configure the PC as the RC, and TDA4 as the EP. Then EP can DMA sensor data directly to the PC's internal memory."

If this configuration means:

1.industrial PC is Master device, and TDA4 is slave device?

2.TDA4's DMA is responsible for transferring data from TDA4 DDR to industrial PC DDR, and the industrial PC side does not require DMA participation?

hubing

0 bing hu over 5 years ago in reply to jian35385

Prodigy 240 points

ok, got it, thanks Jian.

i will make a test follow this link.

0 bing hu over 5 years ago in reply to jian35385

Prodigy 240 points

Hi Jian

When debugging pcie's driver according to the link, I found that the corresponding version below PSDK7.0, patch cannot be used for kernel 5.4.40

http://software-dl.ti.com/jacinto7/esd/processor-sdk-linux-jacinto7/latest/exports/docs/linux/Foundational_Components/Kernel/Kernel_Drivers/PCIe/PCIe_End_Point.html

Is there a patch of PSDK7.0 kernel 5.4.40 ？

thanks

hubing

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Multiple TDA4 cascaded through PCIE