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Yt_aem's avatar
Yt_aem
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3 years ago

How to implement LFPS in Cyclone 10 GX transceiver IP

Hi, I am gonna design a USB3.0 port by using the Cyclone 10GX transceiver IP. In USB3.0/3.1 it needs to send a side band signal, Low frequency Period Signal(LFPS) to other partners . Is there anyone...
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ZiYing_Intel's avatar
ZiYing_Intel
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3 years ago

Hi Yt_aem,


"In USB3.0/3.1 it needs to send a side band signal, Low frequency Period Signal(LFPS) to other partners." Can you clarify more about this? May I know that it will send to which things?


Best regards,

zying


Yt_aem's avatar
Yt_aem
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3 years ago

Hi Zying,

In USB3.0/3.1 protocol, when you plug in a USB C connector the first thing of first is that both source and device ends send out a low frequency clock signal about 10 MHz over the transmit line of the USB to let the partner know "I am connected" or to wake up each other then they go to training mode. See USB3.0/3.1 spec.

From your Intel Dev board for cyclone 10 GX there is a reference design for USB3.1 interface in circuitry. See sheet 24 of the schematic attached. I did not find any circuit to support this side band clock signal. That looks like it has to be generated from the cyclone 10 GX transceiver itself. If this is true, my question is, how to configure the transceiver by Quartus Prime software?

Thanks

Yaoting