nexys4ddr: fix eth/int_n pin (B8) and use 4-bit on vga.blue.

litex_boards/platforms/nexys4ddr.py

@@ -126,17 +126,17 @@ _io = [
         Subsignal("mdc",     Pins("C9")),
         Subsignal("mdio",    Pins("A9")),
         Subsignal("rx_er",   Pins("C10")),
-        Subsignal("int_n",   Pins("D8")),
+        Subsignal("int_n",   Pins("B8")),
         IOStandard("LVCMOS33")
      ),
 
     # VGA
      ("vga", 0,
-        Subsignal("red", Pins("A4 C5 B4 A3")),
+        Subsignal("red",   Pins("A4 C5 B4 A3")),
         Subsignal("green", Pins("A6 B6 A5 C6")),
-        Subsignal("blue", Pins("D7 C7 B7")), # D8 is shared with eth int_n
+        Subsignal("blue",  Pins("D7 C7 B7 D8")),
         Subsignal("hsync", Pins("B11")),
-        Subsignal("vsync",  Pins("B12")),
+        Subsignal("vsync", Pins("B12")),
         IOStandard("LVCMOS33")
     ),
 ]

litex_boards/targets/nexys4ddr.py

@@ -48,7 +48,7 @@ class _CRG(Module):
         pll.create_clkout(self.cd_sys2x_dqs, 2*sys_clk_freq, phase=90)
         pll.create_clkout(self.cd_idelay,    200e6)
         pll.create_clkout(self.cd_eth,       50e6)
-        pll.create_clkout(self.cd_vga,    25e6)
+        pll.create_clkout(self.cd_vga,       25e6)
 
         self.submodules.idelayctrl = S7IDELAYCTRL(self.cd_idelay)
 
@@ -102,7 +102,7 @@ class BaseSoC(SoCCore):
                 vga_pads.hsync.eq(terminal.hsync),
                 vga_pads.red.eq(terminal.red[4:8]),
                 vga_pads.green.eq(terminal.green[4:8]),
-                vga_pads.blue.eq(terminal.blue[3:8])
+                vga_pads.blue.eq(terminal.blue[4:8])
             ]
 
         # Leds -------------------------------------------------------------------------------------