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Add option to switch DFIInjector to externally driven DFI

This commit is contained in:
Jędrzej Boczar 2020-10-27 10:55:20 +01:00 committed by Ryszard Różak
parent 4c1ce026e9
commit da2748723d
1 changed files with 18 additions and 11 deletions
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29
litedram/dfii.py
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@ -48,9 +48,12 @@ class PhaseInjector(Module, AutoCSR):
class DFIInjector(Module, AutoCSR):
def __init__(self, addressbits, bankbits, nranks, databits, nphases=1):
inti = dfi.Interface(addressbits, bankbits, nranks, databits, nphases)
self.slave = dfi.Interface(addressbits, bankbits, nranks, databits, nphases)
self.master = dfi.Interface(addressbits, bankbits, nranks, databits, nphases)
self.slave = dfi.Interface(addressbits, bankbits, nranks, databits, nphases)
self.master = dfi.Interface(addressbits, bankbits, nranks, databits, nphases)
csr_dfi = dfi.Interface(addressbits, bankbits, nranks, databits, nphases)
self.ext_dfi = dfi.Interface(addressbits, bankbits, nranks, databits, nphases)
self.ext_dfi_sel = Signal()
self._control = CSRStorage(fields=[
CSRField("sel", size=1, values=[
@ -62,17 +65,21 @@ class DFIInjector(Module, AutoCSR):
CSRField("reset_n", size=1),
])
for n, phase in enumerate(inti.phases):
for n, phase in enumerate(csr_dfi.phases):
setattr(self.submodules, "pi" + str(n), PhaseInjector(phase))
# # #
self.comb += If(self._control.fields.sel,
self.slave.connect(self.master)
).Else(
inti.connect(self.master)
self.comb += If(self._control.fields.sel, # Hardware
If(self.ext_dfi_sel, # Hardware through ext_dfi
self.ext_dfi.connect(self.master)
).Else( # Hardware by LiteDRAM controller
self.slave.connect(self.master)
)
).Else( # Software through CSRs
csr_dfi.connect(self.master)
)
for i in range(nranks):
self.comb += [phase.cke[i].eq(self._control.fields.cke) for phase in inti.phases]
self.comb += [phase.odt[i].eq(self._control.fields.odt) for phase in inti.phases if hasattr(phase, "odt")]
self.comb += [phase.reset_n.eq(self._control.fields.reset_n) for phase in inti.phases if hasattr(phase, "reset_n")]
self.comb += [phase.cke[i].eq(self._control.fields.cke) for phase in csr_dfi.phases]
self.comb += [phase.odt[i].eq(self._control.fields.odt) for phase in csr_dfi.phases if hasattr(phase, "odt")]
self.comb += [phase.reset_n.eq(self._control.fields.reset_n) for phase in csr_dfi.phases if hasattr(phase, "reset_n")]