Hello
I've written simple code to instantiate buffer and generate a square wave.
The code is working fine for OBUFDS, but for tri-state buffers (OBUFTDS &
IOBUFDS), there is nothing on the output. All 3 files are attached. Would
you please let me know what could be wrong? Do we need to do something more
to use tri-state buffers?
Note: In kc705 platform file, I changed output standard of user_sma_gpio_p
and user_sma_gpio_n pins to LVDS25 (a quick hack basically).
Regards
Arpit Agrawal
#!/usr/bin/env python3
from migen import *
from migen.build.platforms import kc705
class DifferentialTristate(TSTriple):
def get_tristate(self, pad, pad_n):
return Instance("IOBUFDS",
i_I=self.i, o_O=self.o, i_T=self.oe,
io_IO=pad, io_IOB=pad_n)
if __name__ == "__main__":
plat = kc705.Platform()
m = Module()
signal1 = Signal(reset=0)
count1 = Signal(max=1000, reset=0)
diff1 = DifferentialTristate()
m.specials += diff1.get_tristate(plat.request("user_sma_gpio_p"),
plat.request("user_sma_gpio_n"))
m.comb += [
diff1.oe.eq(1),
diff1.i.eq(signal1)
]
m.sync += [
If(count1 < 999,
count1.eq(count1 + 1)
).Else(
count1.eq(0),
signal1.eq(~signal1)
)
]
plat.build(m, run=True, build_dir="differential", build_name="differential")
plat.create_programmer().flash(0, "differential.bin")
#!/usr/bin/env python3
from migen import *
from migen.build.platforms import kc705
class DifferentialTristate(TSTriple):
def get_tristate(self, pad, pad_n):
return Instance("OBUFDS",
i_I=self.i,
o_O=pad, o_OB=pad_n)
if __name__ == "__main__":
plat = kc705.Platform()
m = Module()
signal1 = Signal(reset=0)
count1 = Signal(max=1000, reset=0)
diff1 = DifferentialTristate()
m.specials += diff1.get_tristate(plat.request("user_sma_gpio_p"),
plat.request("user_sma_gpio_n"))
m.comb += [
# diff1.oe.eq(1),
diff1.i.eq(signal1)
]
m.sync += [
If(count1 < 999,
count1.eq(count1 + 1)
).Else(
count1.eq(0),
signal1.eq(~signal1)
)
]
plat.build(m, run=True, build_dir="differential", build_name="differential")
plat.create_programmer().flash(0, "differential.bin")
#!/usr/bin/env python3
from migen import *
from migen.build.platforms import kc705
class DifferentialTristate(TSTriple):
def get_tristate(self, pad, pad_n):
return Instance("OBUFTDS",
i_I=self.i, i_T=self.oe,
o_O=pad, o_OB=pad_n)
if __name__ == "__main__":
plat = kc705.Platform()
m = Module()
signal1 = Signal(reset=0)
count1 = Signal(max=1000, reset=0)
diff1 = DifferentialTristate()
m.specials += diff1.get_tristate(plat.request("user_sma_gpio_p"),
plat.request("user_sma_gpio_n"))
m.comb += [
diff1.oe.eq(1),
diff1.i.eq(signal1)
]
m.sync += [
If(count1 < 999,
count1.eq(count1 + 1)
).Else(
count1.eq(0),
signal1.eq(~signal1)
)
]
plat.build(m, run=True, build_dir="differential", build_name="differential")
plat.create_programmer().flash(0, "differential.bin")
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