DS320PR822: Need help with a design

Ramgopal Divakar

Part Number: DS320PR822
Other Parts Discussed in Thread: DS160PR810

I would like to steer my host root complex to either a x8 PCIe slot or 2 x x4 slots as shown in the figure below. What would be a good IC?

4 months ago

0 Gregory Kobyakov 4 months ago

TI__Genius 10940 points

Hi Ramgopal,

Are you intending to MUX between two different configurations? In this case, the DS320PR822 can be an option. If MUX functionality is not needed, the DS160PR810 redriver is protocol agnostic and will be able to work with bifurcation settings determined by the host.

Best regards,

Greg

0 Ramgopal Divakar 3 months ago

Expert 1335 points

Yes, I need the MUX functionality. Also depicted in the diagram above.

0 Gregory Kobyakov 3 months ago in reply to Ramgopal Divakar

TI__Genius 10940 points

Hi Ramgopal,

In this case, the DS320PR822 will be the most similar device in our portfolio to your required application.

Best regards,

Greg

0 Ramgopal Divakar 3 months ago in reply to Gregory Kobyakov

Expert 1335 points

So,

First IC:

I connect my first 4 PCIe lanes from Ryzen to lanes 0, 2, 4, and 6, and leave 1, 3, 5, and 7 unconnected at the RXP? Likewise in the direction towards the Ryzen at the TXP pins?

Second IC:
Second 4 lanes.

0 Ramgopal Divakar 3 months ago in reply to Ramgopal Divakar

Expert 1335 points

I also plan to use mode L1. Can I use Microchip 2 Kb AT24C02C-SSHM-B? It worked well with DS160PR410RNQT in our previous design.

0 Gregory Kobyakov 3 months ago in reply to Ramgopal Divakar

TI__Genius 10940 points

Hi Ramgopal,

I will check on this and will get back to you as soon as possible.

Best regards,

Greg

0 Gregory Kobyakov 3 months ago in reply to Gregory Kobyakov

TI__Genius 10940 points

Hi Ramgopal,

This EEPROM should be OK to use. Regarding your intended application, can you clarify why you intend to use channels 1, 3, 5, and 7 for the input?

Best regards,

Greg

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DS320PR822: Need help with a design