PCIe GEN2 on AM5728?

Christopher Peters

Other Parts Discussed in Thread: AM5728

Recently downloaded the 2.0.2 Processor SDK and I have noticed this in the pcie_sample.h file.

/* Do gen2 on all devices except am57xx */
#if !defined(SOC_AM572x) && !defined(SOC_AM572x)
#define GEN2
#endif

I really really hope that is not required. We need GEN2 speed and it seemed to work with the sample code in the previous Processor SDK 2.0.1.

It's also unusual how the same device is tested twice, SOC_AM572x.

Can someone please comment on this?

over 9 years ago

0 Biser Gatchev-XID over 9 years ago

TI__Guru**** 393215 points

Which SDK are you asking about? There are three different ones.

0 -DK- over 9 years ago

TI__Mastermind 27890 points

Support for PCIe Gen2 (5.0GT/s) on AM572x is being deprecated. This will be reflected in upcoming revisions of the device documentation.

PCIe Gen1 (2.5GT/s) is still a supported configuration.

0 Christopher Peters over 9 years ago in reply to Biser Gatchev-XID

Genius 3380 points

Biser, I assume you are asking about TI-RTOS vs Linux? We are TI-RTOS on the DSP core.

0 Biser Gatchev-XID over 9 years ago in reply to Christopher Peters

TI__Guru**** 393215 points

Yes, but DK already answered this.

0 UNA over 9 years ago in reply to -DK-

Mastermind 7980 points

Hi , DK

AM571x use the same PCIe module?
Does PCIe Gen2 support for AM571x is being deprecated as well?

Best regards,
H.U

0 Rogerio Almeida over 9 years ago in reply to UNA

TI__Mastermind 26195 points

Please wait a couple of days more since we are working on this subject.

0 Tim Dylla over 8 years ago in reply to Rogerio Almeida

Expert 1070 points

I stumbled over this thread and I'm a bit concerned.

We had similar issues with a Keystone I device when advertised RAM bandwidths were silently deprecated without ever mentioning it in the device datasheet. We took the am5728 into account for hw development because of the 10GBps PCIe bandwidth (among other features).

I see that the newest version of the example header does not distinguish between platforms anymore and always uses GEN2. But I'd like to have a final statement on this issue before we dig deeper into development on an probably inapplicable processor family - Maybe enough time has passed to have an answer ready? ;)

0 lding over 8 years ago in reply to Tim Dylla

TI__Guru* 95265 points

Tim,

See the latest Silicon errata http://www.ti.com/lit/er/sprz429j/sprz429j.pdf i925 PCI-Express Gen2 (5.0 GT/s) Operation Not Supported When Operating Junction Temperature <0°C.

So it really depends on your working enviornment of the deisgn.

Regards, Eric

0 Tim Dylla over 8 years ago in reply to lding

Expert 1070 points

Eric,

yeah, already read this - if there's nothing more to worry about I'm fine with it.

Thanks for clarifying it,

Tim

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PCIe GEN2 on AM5728?