Problem with signing spins on Cylone GX IV

I am not sure, but aren't these transceiver pins? If yes, then You can't choose LVTTL, 3.3V, 2.5V, etc voltages for those pins...

I thought the voltage for transceiver pins would be 1.5-V PCML. But when I changed the I/O Standard to 1.5-V PCML, it created a differential pin, and I don't know what it is for. :confused:

Well that's correct, the transceiver uses differential signaling.

This is the error I got:

Error: Differential I/O output pin TDp is assigned to a non differential location C2. However, it must be assigned to a differential output location
Error: Differential I/O output pin TDp(n) is assigned to a non differential location C1. However, it must be assigned to a differential output location

When You select pin as differential, Pin Planner automatically creates positive and negative pins, so assign a signal to proper pins.

Can you tell me the name of the differential pins for transceiver on Cyclone GX IV? :)

which device exactly?

C1, C2 for TX1

I got this error:

Error: Differential I/O output pin TDp is assigned to a non differential location G2. However, it must be assigned to a differential output location
Error: Differential I/O output pin TDp(n) is assigned to a non differential location G1. However, it must be assigned to a differential output location