lattice/common: add LatticeiCE40DDRInput, LatticeiCE40SDROutput and LatticeiCE40SDRInput.

litex/build/lattice/common.py

@@ -1,4 +1,4 @@
-# This file is Copyright (c) 2015-2019 Florent Kermarrec <florent@enjoy-digital.fr>
+# This file is Copyright (c) 2015-2020 Florent Kermarrec <florent@enjoy-digital.fr>
 # This file is Copyright (c) 2017 William D. Jones <thor0505@comcast.net>
 # This file is Copyright (c) 2019 David Shah <dave@ds0.me>
 # License: BSD
@@ -142,10 +142,16 @@ class LatticeiCE40AsyncResetSynchronizerImpl(Module):
     def __init__(self, cd, async_reset):
         rst1 = Signal()
         self.specials += [
-            Instance("SB_DFFS", i_D=0, i_S=async_reset,
+            Instance("SB_DFFS",
-                     i_C=cd.clk, o_Q=rst1),
+                i_D= 0,
-            Instance("SB_DFFS", i_D=rst1, i_S=async_reset,
+                i_S= async_reset,
-                     i_C=cd.clk, o_Q=cd.rst)
+                i_C= cd.clk,
+                o_Q= rst1),
+            Instance("SB_DFFS",
+                i_D = rst1,
+                i_S = async_reset,
+                i_C = cd.clk,
+                o_Q = cd.rst)
         ]
 
 
@@ -154,7 +160,7 @@ class LatticeiCE40AsyncResetSynchronizer:
     def lower(dr):
         return LatticeiCE40AsyncResetSynchronizerImpl(dr.cd, dr.async_reset)
 
-# iCE40 Trellis Tristate ---------------------------------------------------------------------------
+# iCE40 Tristate -----------------------------------------------------------------------------------
 
 class LatticeiCE40TristateImpl(Module):
     def __init__(self, io, o, oe, i):
@@ -162,7 +168,7 @@ class LatticeiCE40TristateImpl(Module):
         if nbits == 1:
             self.specials +=  [
                 Instance("SB_IO",
-                    p_PIN_TYPE      = C(0b101001, 6),
+                    p_PIN_TYPE      = C(0b101001, 6), # PIN_OUTPUT_TRISTATE + PIN_INPUT
                     io_PACKAGE_PIN  = io,
                     i_OUTPUT_ENABLE = oe,
                     i_D_OUT_0       = o,
@@ -173,7 +179,7 @@ class LatticeiCE40TristateImpl(Module):
             for bit in range(nbits):
                 self.specials += [
                     Instance("SB_IO",
-                        p_PIN_TYPE      = C(0b101001, 6),
+                        p_PIN_TYPE      = C(0b101001, 6), # PIN_OUTPUT_TRISTATE + PIN_INPUT
                         io_PACKAGE_PIN  = io[bit],
                         i_OUTPUT_ENABLE = oe,
                         i_D_OUT_0       = o[bit],
@@ -193,16 +199,15 @@ class LatticeiCE40DifferentialOutputImpl(Module):
     def __init__(self, i, o_p, o_n):
         self.specials += [
             Instance("SB_IO",
-                p_PIN_TYPE     = C(0b011000, 6),
+                p_PIN_TYPE     = C(0b011000, 6), # PIN_OUTPUT
                 p_IO_STANDARD  = "SB_LVCMOS",
                 io_PACKAGE_PIN = o_p,
                 i_D_OUT_0      = i
             )
         ]
-
         self.specials += [
             Instance("SB_IO",
-                p_PIN_TYPE     = C(0b011000, 6),
+                p_PIN_TYPE     = C(0b011000, 6), # PIN_OUTPUT
                 p_IO_STANDARD  = "SB_LVCMOS",
                 io_PACKAGE_PIN = o_n,
                 i_D_OUT_0      = ~i
@@ -215,14 +220,13 @@ class LatticeiCE40DifferentialOutput:
     def lower(dr):
         return LatticeiCE40DifferentialOutputImpl(dr.i, dr.o_p, dr.o_n)
 
-
 # iCE40 DDR Output ---------------------------------------------------------------------------------
 
 class LatticeiCE40DDROutputImpl(Module):
     def __init__(self, i1, i2, o, clk):
         self.specials += [
             Instance("SB_IO",
-                p_PIN_TYPE      = C(0b010000, 6),
+                p_PIN_TYPE      = C(0b010000, 6), # PIN_OUTPUT_DDR
                 p_IO_STANDARD   = "SB_LVCMOS",
                 io_PACKAGE_PIN  = o,
                 i_CLOCK_ENABLE  = 1,
@@ -239,11 +243,50 @@ class LatticeiCE40DDROutput:
     def lower(dr):
         return LatticeiCE40DDROutputImpl(dr.i1, dr.i2, dr.o, dr.clk)
 
+# iCE40 DDR Input ----------------------------------------------------------------------------------
+
+class LatticeiCE40DDRInputImpl(Module):
+    def __init__(self, i, o1, o2, clk):
+        self.specials += [
+            Instance("SB_IO",
+                p_PIN_TYPE      = C(0b000000, 6),  # PIN_INPUT_DDR
+                p_IO_STANDARD   = "SB_LVCMOS",
+                io_PACKAGE_PIN  = i,
+                i_CLOCK_ENABLE  = 1,
+                i_INPUT_CLK     = clk,
+                o_D_IN_0        = o1,
+                o_D_IN_1        = o2
+            )
+        ]
+
+
+class LatticeiCE40DDRInput:
+    @staticmethod
+    def lower(dr):
+        return LatticeiCE40DDRInputImpl(dr.i, dr.o1, dr.o2, dr.clk)
+
+# iCE40 SDR Output ---------------------------------------------------------------------------------
+
+class LatticeiCE40SDROutput:
+    @staticmethod
+    def lower(dr):
+        return LatticeiCE40DDROutputImpl(dr.i, dr.i, dr.o, dr.clk)
+
+# iCE40 SDR Input ----------------------------------------------------------------------------------
+
+class LatticeiCE40SDRInput:
+    @staticmethod
+    def lower(dr):
+        return LatticeiCE40DDRInputImpl(dr.i, dr.o, Signal(), dr.clk)
+
 # iCE40 Trellis Special Overrides ------------------------------------------------------------------
 
 lattice_ice40_special_overrides = {
     AsyncResetSynchronizer: LatticeiCE40AsyncResetSynchronizer,
     Tristate:               LatticeiCE40Tristate,
     DifferentialOutput:     LatticeiCE40DifferentialOutput,
-    DDROutput:              LatticeiCE40DDROutput
+    DDROutput:              LatticeiCE40DDROutput,
+    DDRInput:               LatticeiCE40DDRInput,
+    SDROutput:              LatticeiCE40SDROutput,
+    SDRInput:               LatticeiCE40SDRInput,
 }