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spi: add diff_term, save power on outputs

This commit is contained in:
Robert Jördens 2018-01-02 11:32:55 +01:00
parent 6d20b71dde
commit 2f8e6c7462
1 changed files with 16 additions and 6 deletions
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22
artiq/gateware/spi.py
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@ -238,22 +238,32 @@ class SPIMaster(Module):
else: else:
if hasattr(pads, "cs_n"): if hasattr(pads, "cs_n"):
for i in range(len(pads.cs_n)): for i in range(len(pads.cs_n)):
self.specials += Instance("IOBUFDS", self.specials += Instance("OBUFTDS",
i_I=(cs[i] & spi.cs) ^ ~config.cs_polarity, i_I=(cs[i] & spi.cs) ^ ~config.cs_polarity,
i_T=config.offline, i_T=config.offline,
io_IO=pads.cs_n[i], io_IOB=pads_n.cs_n[i]) o_O=pads.cs_n[i], o_OB=pads_n.cs_n[i])
self.specials += Instance("IOBUFDS", self.specials += Instance("OBUFTDS",
i_I=clk, i_T=config.offline, i_I=clk, i_T=config.offline,
io_IO=pads.clk, io_IOB=pads_n.clk) o_O=pads.clk, o_OB=pads_n.clk)
mosi = Signal() mosi = Signal()
self.specials += Instance("IOBUFDS", self.specials += Instance("IOBUFDS_INTERMDISABLE",
p_DIFF_TERM="TRUE",
p_IBUF_LOW_PWR="FALSE",
p_USE_IBUFDISABLE="TRUE",
i_IBUFDISABLE=config.offline | mosi_oe,
i_INTERMDISABLE=config.offline | mosi_oe,
o_O=mosi, i_I=spi.reg.o, i_T=~mosi_oe, o_O=mosi, i_I=spi.reg.o, i_T=~mosi_oe,
io_IO=pads.mosi, io_IOB=pads_n.mosi) io_IO=pads.mosi, io_IOB=pads_n.mosi)
if hasattr(pads, "miso"): if hasattr(pads, "miso"):
miso = Signal() miso = Signal()
self.specials += Instance("IBUFDS", self.specials += Instance("IBUFDS_INTERMDISABLE",
p_DIFF_TERM="TRUE",
p_IBUF_LOW_PWR="FALSE",
p_USE_IBUFDISABLE="TRUE",
i_IBUFDISABLE=config.offline,
i_INTERMDISABLE=config.offline,
o_O=miso, i_I=pads.miso, i_IB=pads_n.miso) o_O=miso, i_I=pads.miso, i_IB=pads_n.miso)
else: else:
miso = mosi miso = mosi