kc705: fix SFP GTX polarity

jordens · jordens · commit 948a234d28ef · 2017-10-27T17:45:21.000Z
TX was wrong for old boards. RX was wrong for new boards.

Use the new (rev1.1+) polarities. Add note about swapping for old
boards.

UG810:
On KC705 boards prior to Rev 1.1, SFP+ connector P5 pin 18 RD_P is
connected to net SFP_RX_N, and pin 19 RD_N
is connected to net SFP_RX_P.
On KC705 boards prior to Rev 1.1, SFP+ connector P5 pin 18 TD_P is
connected to net SFP_TX_N, and pin 19 TD_N
is connected to net SFP_TX_P.
diff --git a/migen/build/platforms/kc705.py b/migen/build/platforms/kc705.py
@@ -213,15 +213,16 @@
         Subsignal("p", Pins("K6")),
         Subsignal("n", Pins("K5"))
     ),
-    ("sfp_tx", 0,
+    ("sfp_tx", 0,  # inverted prior to HW rev 1.1
         Subsignal("p", Pins("H2")),
         Subsignal("n", Pins("H1"))
     ),
-    ("sfp_rx", 0,
-        Subsignal("p", Pins("G4")),
-        Subsignal("n", Pins("G3"))
+    ("sfp_rx", 0,  # inverted prior to HW rev 1.1
+        Subsignal("p", Pins("G3")),
+        Subsignal("n", Pins("G4"))
     ),
     ("sfp_tx_disable_n", 0, Pins("Y20"), IOStandard("LVCMOS25")),
+    ("sfp_rx_los", 0, Pins("P19"), IOStandard("LVCMOS25")),
 
     ("si5324", 0,
         Subsignal("rst_n", Pins("AE20"), IOStandard("LVCMOS25")),
