DRA726: PCIe dual controller usage

Jelena

Part Number: DRA726

Hello,

Is it possible to connect the two PCIe ports on the DRA72x to two separate PCIe devices directly (i.e. without a switch)?

Referring to "Figure 26-18. PCIe PHY I/O Signals" in DRA72x TRM (vS), it shows both PCIe PHYs connecting to a single device, so the question is can TX0/RX0 go to one PCIe device and TX1/RX1 go to the other device and both devices be clocked off ljcb (configured as master)? If this is possible, are there any concerns with synchronization since the two devices are independent of each other?

Thanks in advance,

Jelena

over 8 years ago

0 Alex Bashkov over 8 years ago

TI__Genius 13690 points

Hi Jelena,

I have pinged PCIe expert for help here.

Thanks,
Alex

0 Stanislav Stilyanov over 8 years ago

TI__Mastermind 20190 points

Hi Jelena,

Port USB (PHY USB) can be utilized by either PCIe controller 1 in 2-lane mode, or by PCIe controller 2. In the latter case (0x0 (C0)), two independent PCI devices can be connected to DRA72x. In any of the two PCIe cases however, you will have to sacrifice USB3.0 functionality. See below:

ljcb clocking is common for the two PCIe ports.

Regards,

Stan

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DRA726: PCIe dual controller usage