revert part of 948a234 (rx pin polarity)

jordens · jordens · commit 891562a6a32d · 2017-10-27T18:01:29.000Z
The UCF in UG810 does not match Table 1-14. The table matches the package pinout however: https://www.xilinx.com/support/packagefiles/k7packages/xc7k325tffg900pkg.txt Keep the comment change and the LOS addition.
diff --git a/migen/build/platforms/kc705.py b/migen/build/platforms/kc705.py
@@ -218,8 +218,8 @@
         Subsignal("n", Pins("H1"))
     ),
     ("sfp_rx", 0,  # inverted prior to HW rev 1.1
-        Subsignal("p", Pins("G3")),
-        Subsignal("n", Pins("G4"))
+        Subsignal("p", Pins("G4")),
+        Subsignal("n", Pins("G3"))
     ),
     ("sfp_tx_disable_n", 0, Pins("Y20"), IOStandard("LVCMOS25")),
     ("sfp_rx_los", 0, Pins("P19"), IOStandard("LVCMOS25")),
