platforms/trellisboard: add SDCard PMOD pins.

litex_boards/platforms/trellisboard.py

@@ -209,9 +209,35 @@ _connectors = [
     ("ext0", "T1 U1 AE5 AE4 AB5 AB6 Y5 W5 W2 Y1 AB7 AC6 AB3 AB4 AD3 AE3 AB1 AC1 AD1 AE1 AD6 AE6 AC7 AD7"),
     ("ext1", "P5 P4 R7 T7 R6 T6 U6 U7 R4 T5 T4 U5 U4 V4 V6 V7 P2 P3 R3 T3 N1 P1 U2 U3"),
     ("ext2", "K6 K7 J7 J6 H6 H5 F4 F5 F3 E3 C4 C3 C5 D5 D3 D2 H2 H3 J3 K3 B1 C2 F1 H1")
-
 ]
 
+
+# PMODS --------------------------------------------------------------------------------------------
+
+def sdcard_pmod_io(pmod):
+    return [
+        # SDCard PMOD:
+        # - https://store.digilentinc.com/pmod-microsd-microsd-card-slot/
+        # - https://github.com/antmicro/arty-expansion-board
+        ("spisdcard", 0,
+            Subsignal("clk",  Pins(f"{pmod}:3")),
+            Subsignal("mosi", Pins(f"{pmod}:1"), Misc("PULLMODE=UP")),
+            Subsignal("cs_n", Pins(f"{pmod}:0"), Misc("PULLMODE=UP")),
+            Subsignal("miso", Pins(f"{pmod}:2"), Misc("PULLMODE=UP")),
+            Misc("SLEWRATE=FAST"),
+            IOStandard("LVCMOS33"),
+        ),
+        ("sdcard", 0,
+            Subsignal("data", Pins(f"{pmod}:2 {pmod}:4 {pmod}:5 {pmod}:0"), Misc("PULLMODE=UP")),
+            Subsignal("cmd",  Pins(f"{pmod}:1"), Misc("PULLMODE=UP")),
+            Subsignal("clk",  Pins(f"{pmod}:3")),
+            Subsignal("cd",   Pins(f"{pmod}:6")),
+            Misc("SLEWRATE=FAST"),
+            IOStandard("LVCMOS33"),
+        ),
+]
+_sdcard_pmod_io = sdcard_pmod_io("pmoda") # SDCARD PMOD on PMODA.
+
 # Platform -----------------------------------------------------------------------------------------
 
 class Platform(LatticePlatform):