dvisampler: support differential input

milkymist/dvisampler/__init__.py

@@ -19,11 +19,19 @@ class DVISampler(Module, AutoCSR):
 		for datan in range(3):
 			name = "data" + str(datan)
 			invert = False
-			try:
-				s = getattr(pads, name)
-			except AttributeError:
-				s = getattr(pads, name + "_n")
-				invert = True
+			if hasattr(pads, name + "_p"):
+				s = Signal()
+				self.specials += Instance("IBUFDS",
+					Instance.Input("I", getattr(pads, name + "_p")),
+					Instance.Input("IB", getattr(pads, name + "_n")),
+					Instance.Output("O", s)		
+				)
+			else:
+				try:
+					s = getattr(pads, name)
+				except AttributeError:
+					s = getattr(pads, name + "_n")
+					invert = True
 			
 			cap = DataCapture(8, invert)
 			setattr(self.submodules, name + "_cap", cap)

milkymist/dvisampler/clocking.py

@@ -16,6 +16,16 @@ class Clocking(Module, AutoCSR):
 
 		###
 
+		if hasattr(pads, "clk_p"):
+			clkin = Signal()
+			self.specials += Instance("IBUFDS",
+				Instance.Input("I", pads.clk_p),
+				Instance.Input("IB", pads.clk_n),
+				Instance.Output("O", clkin)		
+			)
+		else:
+			clkin = pads.clk
+
 		clkfbout = Signal()
 		pll_locked = Signal()
 		pll_clk0 = Signal()
@@ -39,7 +49,7 @@ class Clocking(Module, AutoCSR):
 			Instance.Output("CLKOUT3", pll_clk3),
 			Instance.Output("LOCKED", pll_locked),
 			Instance.Input("CLKFBIN", clkfbout),
-			Instance.Input("CLKIN", pads.clk),
+			Instance.Input("CLKIN", clkin),
 			Instance.Input("RST", self._r_pll_reset.storage)
 		)