Hi,
I am connecting hyperlink between two 66AK2H14 devices. In K2H SERDES userguide ( SPRUHO3A) , it is mentioned under hyperlink section that:
HyperLink lanes can be swapped to simplify routing. The differential pairing must be maintained.
Does this mean that I can connect any TX line of one device to any RX of another device?
But TXP must be connected to any of the RXP and TXN must be connected to any of the RXN. Please correct me if my understanding is wrong.
Thanks & Regards,
Madhu
Hi Madhu,
This one has been answered a number of time but let me try again.
1) All Hyperlink signals must be Routed and connected differential. The P and the N signals for any receive pair must be connected to a P and N of a transmit pair and visa versa. For example, RX1P must be routed to deferentially with RX1N. The destination must be a transmit pair so a valid connection would be TX2P&N. You cannot connect RX1P and RX1N to TX2P and TX3N.
2) The P and N connections can be swapped so in the example above it is valid to connect RX1P and RX1N to either TX2P and TX2N or TX2N and TX2P.
3) All four lanes must be connected regardless of how many lanes you plan on using.
4) A differential RX pair can be connected to any TX pair to ease routing. There is one caveat to this rule. If you intend to use a single lane for a power saving mode, you must connect RX0 and TX0 from the first part to TX0 and RX0 of the second part. The rest of the lanes can be swapped but the first lane must be connected together.
An example of a valid connection which support the single lane low power mode is shown below.
Regards,
Bill
