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vendor.xilinx_{7series,spartan6}: connect FCDE and IOB directly.

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Before this commit, in some cases there will be an inverter, which is
not allowed on an FDCE with IOB attribute set to true, as it will
interfere with packing.
This commit is contained in:
whitequark 2019-06-15 15:55:10 +00:00
parent 04c07715b4
commit 8b34602d91
2 changed files with 42 additions and 42 deletions
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34
nmigen/vendor/xilinx_7series.py vendored
View file

@ -197,7 +197,7 @@ class Xilinx7SeriesPlatform(TemplatedPlatform):
i = Signal(pin.width, name="{}_xdr_i".format(pin.name))
o = Signal(pin.width, name="{}_xdr_o".format(pin.name))
oe = Signal(1, name="{}_xdr_oe".format(pin.name))
t = Signal(1, name="{}_xdr_t".format(pin.name))
if pin.xdr == 0:
if "i" in pin.dir:
@ -205,31 +205,31 @@ class Xilinx7SeriesPlatform(TemplatedPlatform):
if "o" in pin.dir:
m.d.comb += o.eq(pin_o)
if pin.dir in ("oe", "io"):
m.d.comb += oe.eq(pin.oe)
m.d.comb += t.eq(~pin.oe)
elif pin.xdr == 1:
if "i" in pin.dir:
get_dff(pin.i_clk, i, pin_i)
if "o" in pin.dir:
get_dff(pin.o_clk, pin_o, o)
if pin.dir in ("oe", "io"):
get_dff(pin.o_clk, pin.oe, oe)
get_dff(pin.o_clk, ~pin.oe, t)
elif pin.xdr == 2:
if "i" in pin.dir:
get_iddr(pin.i_clk, i, pin_i0, pin_i1)
if "o" in pin.dir:
get_oddr(pin.o_clk, pin_o0, pin_o1, o)
if pin.dir in ("oe", "io"):
get_dff(pin.o_clk, pin.oe, oe)
get_dff(pin.o_clk, ~pin.oe, t)
else:
assert False
return (i, o, oe)
return (i, o, t)
def get_input(self, pin, port, attrs, invert):
self._check_feature("single-ended input", pin, attrs,
valid_xdrs=(0, 1, 2), valid_attrs=True)
m = Module()
i, o, oe = self._get_xdr_buffer(m, pin, i_invert=True if invert else None)
i, o, t = self._get_xdr_buffer(m, pin, i_invert=True if invert else None)
m.d.comb += i.eq(port)
return m
@ -237,7 +237,7 @@ class Xilinx7SeriesPlatform(TemplatedPlatform):
self._check_feature("single-ended output", pin, attrs,
valid_xdrs=(0, 1, 2), valid_attrs=True)
m = Module()
i, o, oe = self._get_xdr_buffer(m, pin, o_invert=True if invert else None)
i, o, t = self._get_xdr_buffer(m, pin, o_invert=True if invert else None)
m.d.comb += port.eq(o)
return m
@ -245,10 +245,10 @@ class Xilinx7SeriesPlatform(TemplatedPlatform):
self._check_feature("single-ended tristate", pin, attrs,
valid_xdrs=(0, 1, 2), valid_attrs=True)
m = Module()
i, o, oe = self._get_xdr_buffer(m, pin, o_invert=True if invert else None)
i, o, t = self._get_xdr_buffer(m, pin, o_invert=True if invert else None)
for bit in range(len(port)):
m.submodules += Instance("OBUFT",
i_T=~oe,
i_T=t,
i_I=o[bit],
o_O=port[bit]
)
@ -258,11 +258,11 @@ class Xilinx7SeriesPlatform(TemplatedPlatform):
self._check_feature("single-ended input/output", pin, attrs,
valid_xdrs=(0, 1, 2), valid_attrs=True)
m = Module()
i, o, oe = self._get_xdr_buffer(m, pin, i_invert=True if invert else None,
i, o, t = self._get_xdr_buffer(m, pin, i_invert=True if invert else None,
o_invert=True if invert else None)
for bit in range(len(port)):
m.submodules += Instance("IOBUF",
i_T=~oe,
i_T=t,
i_I=o[bit],
o_O=i[bit],
io_IO=port[bit]
@ -273,7 +273,7 @@ class Xilinx7SeriesPlatform(TemplatedPlatform):
self._check_feature("differential input", pin, attrs,
valid_xdrs=(0, 1, 2), valid_attrs=True)
m = Module()
i, o, oe = self._get_xdr_buffer(m, pin, i_invert=True if invert else None)
i, o, t = self._get_xdr_buffer(m, pin, i_invert=True if invert else None)
for bit in range(len(p_port)):
m.submodules += Instance("IBUFDS",
i_I=p_port[bit], i_IB=n_port[bit],
@ -285,7 +285,7 @@ class Xilinx7SeriesPlatform(TemplatedPlatform):
self._check_feature("differential output", pin, attrs,
valid_xdrs=(0, 1, 2), valid_attrs=True)
m = Module()
i, o, oe = self._get_xdr_buffer(m, pin, o_invert=True if invert else None)
i, o, t = self._get_xdr_buffer(m, pin, o_invert=True if invert else None)
for bit in range(len(p_port)):
m.submodules += Instance("OBUFDS",
i_I=o[bit],
@ -297,10 +297,10 @@ class Xilinx7SeriesPlatform(TemplatedPlatform):
self._check_feature("differential tristate", pin, attrs,
valid_xdrs=(0, 1, 2), valid_attrs=True)
m = Module()
i, o, oe = self._get_xdr_buffer(m, pin, o_invert=True if invert else None)
i, o, t = self._get_xdr_buffer(m, pin, o_invert=True if invert else None)
for bit in range(len(p_port)):
m.submodules += Instance("OBUFTDS",
i_T=~oe,
i_T=t,
i_I=o[bit],
o_O=p_port[bit], o_OB=n_port[bit]
)
@ -310,11 +310,11 @@ class Xilinx7SeriesPlatform(TemplatedPlatform):
self._check_feature("differential input/output", pin, attrs,
valid_xdrs=(0, 1, 2), valid_attrs=True)
m = Module()
i, o, oe = self._get_xdr_buffer(m, pin, i_invert=True if invert else None,
i, o, t = self._get_xdr_buffer(m, pin, i_invert=True if invert else None,
o_invert=True if invert else None)
for bit in range(len(p_port)):
m.submodules += Instance("IOBUFDS",
i_T=~oe,
i_T=t,
i_I=o[bit],
o_O=i[bit],
io_IO=p_port[bit], io_IOB=n_port[bit]

34
nmigen/vendor/xilinx_spartan6.py vendored
View file

@ -208,7 +208,7 @@ class XilinxSpartan6Platform(TemplatedPlatform):
i = Signal(pin.width, name="{}_xdr_i".format(pin.name))
o = Signal(pin.width, name="{}_xdr_o".format(pin.name))
oe = Signal(1, name="{}_xdr_oe".format(pin.name))
t = Signal(1, name="{}_xdr_t".format(pin.name))
if pin.xdr == 0:
if "i" in pin.dir:
@ -216,14 +216,14 @@ class XilinxSpartan6Platform(TemplatedPlatform):
if "o" in pin.dir:
m.d.comb += o.eq(pin_o)
if pin.dir in ("oe", "io"):
m.d.comb += oe.eq(pin.oe)
m.d.comb += t.eq(~pin.oe)
elif pin.xdr == 1:
if "i" in pin.dir:
get_dff(pin.i_clk, i, pin_i)
if "o" in pin.dir:
get_dff(pin.o_clk, pin_o, o)
if pin.dir in ("oe", "io"):
get_dff(pin.o_clk, pin.oe, oe)
get_dff(pin.o_clk, ~pin.oe, t)
elif pin.xdr == 2:
if "i" in pin.dir:
# Re-register first input before it enters fabric. This allows both inputs to
@ -234,17 +234,17 @@ class XilinxSpartan6Platform(TemplatedPlatform):
if "o" in pin.dir:
get_oddr(pin.o_clk, pin_o0, pin_o1, o)
if pin.dir in ("oe", "io"):
get_dff(pin.o_clk, pin.oe, oe)
get_dff(pin.o_clk, ~pin.oe, t)
else:
assert False
return (i, o, oe)
return (i, o, t)
def get_input(self, pin, port, attrs, invert):
self._check_feature("single-ended input", pin, attrs,
valid_xdrs=(0, 1, 2), valid_attrs=True)
m = Module()
i, o, oe = self._get_xdr_buffer(m, pin, i_invert=True if invert else None)
i, o, t = self._get_xdr_buffer(m, pin, i_invert=True if invert else None)
m.d.comb += i.eq(port)
return m
@ -252,7 +252,7 @@ class XilinxSpartan6Platform(TemplatedPlatform):
self._check_feature("single-ended output", pin, attrs,
valid_xdrs=(0, 1, 2), valid_attrs=True)
m = Module()
i, o, oe = self._get_xdr_buffer(m, pin, o_invert=True if invert else None)
i, o, t = self._get_xdr_buffer(m, pin, o_invert=True if invert else None)
m.d.comb += port.eq(o)
return m
@ -260,10 +260,10 @@ class XilinxSpartan6Platform(TemplatedPlatform):
self._check_feature("single-ended tristate", pin, attrs,
valid_xdrs=(0, 1, 2), valid_attrs=True)
m = Module()
i, o, oe = self._get_xdr_buffer(m, pin, o_invert=True if invert else None)
i, o, t = self._get_xdr_buffer(m, pin, o_invert=True if invert else None)
for bit in range(len(port)):
m.submodules += Instance("OBUFT",
i_T=~oe,
i_T=t,
i_I=o[bit],
o_O=port[bit]
)
@ -273,11 +273,11 @@ class XilinxSpartan6Platform(TemplatedPlatform):
self._check_feature("single-ended input/output", pin, attrs,
valid_xdrs=(0, 1, 2), valid_attrs=True)
m = Module()
i, o, oe = self._get_xdr_buffer(m, pin, i_invert=True if invert else None,
i, o, t = self._get_xdr_buffer(m, pin, i_invert=True if invert else None,
o_invert=True if invert else None)
for bit in range(len(port)):
m.submodules += Instance("IOBUF",
i_T=~oe,
i_T=t,
i_I=o[bit],
o_O=i[bit],
io_IO=port[bit]
@ -288,7 +288,7 @@ class XilinxSpartan6Platform(TemplatedPlatform):
self._check_feature("differential input", pin, attrs,
valid_xdrs=(0, 1, 2), valid_attrs=True)
m = Module()
i, o, oe = self._get_xdr_buffer(m, pin, i_invert=True if invert else None)
i, o, t = self._get_xdr_buffer(m, pin, i_invert=True if invert else None)
for bit in range(len(p_port)):
m.submodules += Instance("IBUFDS",
i_I=p_port[bit], i_IB=n_port[bit],
@ -300,7 +300,7 @@ class XilinxSpartan6Platform(TemplatedPlatform):
self._check_feature("differential output", pin, attrs,
valid_xdrs=(0, 1, 2), valid_attrs=True)
m = Module()
i, o, oe = self._get_xdr_buffer(m, pin, o_invert=True if invert else None)
i, o, t = self._get_xdr_buffer(m, pin, o_invert=True if invert else None)
for bit in range(len(p_port)):
m.submodules += Instance("OBUFDS",
i_I=o[bit],
@ -312,10 +312,10 @@ class XilinxSpartan6Platform(TemplatedPlatform):
self._check_feature("differential tristate", pin, attrs,
valid_xdrs=(0, 1, 2), valid_attrs=True)
m = Module()
i, o, oe = self._get_xdr_buffer(m, pin, o_invert=True if invert else None)
i, o, t = self._get_xdr_buffer(m, pin, o_invert=True if invert else None)
for bit in range(len(p_port)):
m.submodules += Instance("OBUFTDS",
i_T=~oe,
i_T=t,
i_I=o[bit],
o_O=p_port[bit], o_OB=n_port[bit]
)
@ -325,11 +325,11 @@ class XilinxSpartan6Platform(TemplatedPlatform):
self._check_feature("differential input/output", pin, attrs,
valid_xdrs=(0, 1, 2), valid_attrs=True)
m = Module()
i, o, oe = self._get_xdr_buffer(m, pin, i_invert=True if invert else None,
i, o, t = self._get_xdr_buffer(m, pin, i_invert=True if invert else None,
o_invert=True if invert else None)
for bit in range(len(p_port)):
m.submodules += Instance("IOBUFDS",
i_T=~oe,
i_T=t,
i_I=o[bit],
o_O=i[bit],
io_IO=p_port[bit], io_IOB=n_port[bit]