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I tried compiling my firmware in quartus and there is no problev for the "tx" side of GXB to be configured as standard LVDS (under pin assgiement in Quartus v11).
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The Cyclone IV GX Starter kit uses the following transceiver pins:
# Transceivers (SGMII interface or SMA interface)
set pin(enet_tx) {PIN = C2, IOSTD = "1.5-V PCML"}
set pin(enet_tx(n)) {PIN = C1}
set pin(enet_rx) {PIN = E2, IOSTD = "1.5-V PCML"}
set pin(enet_rx(n)) {PIN = E1}
# PCIe Transceivers
set pin(pcie_tx) {PIN = G2, IOSTD = "1.5-V PCML"}
set pin(pcie_tx(n)) {PIN = G1}
set pin(pcie_rx) {PIN = J2, IOSTD = "1.5-V PCML"}
set pin(pcie_rx(n)) {PIN = J1}
Which pins were your "tx" signal using?
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Also can i use "rx" side of GXB as General Purpose output?
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I don't think so. I believe it needs to be driven from the ALTGX component. Try using the pins for GPIO in Quartus and let it make the ultimate decision :)
Cheers,
Dave
Honored Contributor
