colorlight_i9plus: Cosmetic cleanups.

litex_boards/platforms/colorlight_i9plus.py

@@ -11,10 +11,13 @@ from litex.build.openocd import OpenOCD
 # IOs ----------------------------------------------------------------------------------------------
 
 _io = [
+    # Clk.
     ("clk25", 0, Pins("K4"), IOStandard("LVCMOS33")),
+
+    # Leds.
     ("user_led", 0, Pins("A18"), IOStandard("LVCMOS33")),
 
-    # RGMII Ethernet (B50612D)
+    # RGMII Ethernet (B50612D) PHY 0.
     ("eth_clocks", 0, # U5 is SDIO phy #0
         Subsignal("tx", Pins("A1")),
         Subsignal("rx", Pins("H4")),
@@ -30,6 +33,7 @@ _io = [
         Subsignal("tx_data", Pins("B2 B1 C2 D2")),
         IOStandard("LVCMOS33")
     ),
+    # RGMII Ethernet (B50612D) PHY 1.
     ("eth_clocks", 1, # U9 is SDIO phy #1
         Subsignal("tx", Pins("M6")),
         Subsignal("rx", Pins("L3")),
@@ -45,12 +49,12 @@ _io = [
         Subsignal("tx_data", Pins("M5 M2 N4 P4")),
         IOStandard("LVCMOS33")
     ),
-    # M12L64322A
+    # SDRRAM (M12L64322A).
     ("sdram_clock", 0, Pins("E14"), IOStandard("LVCMOS33")),
     ("sdram", 0,
         Subsignal("a", Pins(
             "C20 C19 C13 F13 G13 G15 "
-            "F14 F18 E13 E18 C14 A13")),  # address pin A11 routed but NC on M12L64322A
+            "F14 F18 E13 E18 C14 A13")),  # Address pin A11 routed but NC on M12L64322A
         Subsignal("dq", Pins(
             "F21 E22 F20 E21 F19 D22 E19 D21 "
             "K21 L21 K22 M21 L20 M22 N20 M20 "
@@ -60,10 +64,10 @@ _io = [
         Subsignal("we_n",  Pins("D17")),
         Subsignal("ras_n", Pins("A14")),
         Subsignal("cas_n", Pins("D14")),
-        #Subsignal("cs_n", Pins("")), # gnd
-        #Subsignal("cke",  Pins("")), # 3v3
+        #Subsignal("cs_n", Pins("")), # GND
+        #Subsignal("cke",  Pins("")), # 3V3
         Subsignal("ba",    Pins("D19 B13")),
-        #Subsignal("dm",   Pins("")), # gnd
+        #Subsignal("dm",   Pins("")), # GND
         IOStandard("LVCMOS33"),
         Misc("SLEWRATE=FAST")
     ),
@@ -97,7 +101,6 @@ _connectors = [
     )
 ]
 
-
 def pmod_uart(port="P2"):
     if port == "P2":
         return [