Started on component selection of the final PCB.

exi_bba/synth.py

@@ -116,8 +116,10 @@ class BBATopSynth(BBATop):
             ]
 
             # ── Bring-up status panel → onboard LEDs / button ──────────────
-            # Two discrete LEDs answer the #1 bring-up question on a real GC:
-            #   LEDG = heartbeat (clock alive)   LEDR = EXI activity (GC talking)
+            # All 5 panel LEDs mapped:
+            #   LEDG (pin 37)        = led[0] heartbeat
+            #   LEDR (pin 11)        = led[1] EXI activity
+            #   RGB  (pins 39/40/41) = led[2] rx / led[3] tx / led[4] ready
             # The one onboard button → panel btn[1] (manual re-init).
             if self._status_panel:
                 ledr = platform.request("ledr", 0)
@@ -132,6 +134,25 @@ class BBATopSynth(BBATop):
                     self.panel_btn.eq(Cat(C(1, 1), btn.i, C(1, 1))),
                 ]
 
+                # iCEbreaker RGB LED has no series resistors — must use
+                # SB_RGBA_DRV (raw pad driver with built-in current source).
+                # RGB0=red→rx_act  RGB1=green→tx_act  RGB2=blue→ready
+                # Verify colour-to-element mapping against schematic at bring-up.
+                m.submodules.rgb_drv = Instance("SB_RGBA_DRV",
+                    p_CURRENT_MODE="0b1",
+                    p_RGB0_CURRENT="0b000001",
+                    p_RGB1_CURRENT="0b000001",
+                    p_RGB2_CURRENT="0b000001",
+                    i_CURREN=Const(1, 1),
+                    i_RGBLEDEN=Const(1, 1),
+                    i_RGB0PWM=led[2],
+                    i_RGB1PWM=led[3],
+                    i_RGB2PWM=led[4],
+                    o_RGB0=Signal(name="rgb_r"),
+                    o_RGB1=Signal(name="rgb_g"),
+                    o_RGB2=Signal(name="rgb_b"),
+                )
+
         return m