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frontend/bist: add random parameter on generator/checker to ease debug

This commit is contained in:
Florent Kermarrec 2016-06-02 18:35:45 +02:00
parent a5ff573046
commit 0faee6639d
1 changed files with 29 additions and 13 deletions
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42
litedram/frontend/bist.py
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@ -30,8 +30,18 @@ class LFSR(Module):
] ]
@CEInserter()
class Counter(Module):
def __init__(self, n_out):
self.o = Signal(n_out)
# # #
self.sync += self.o.eq(self.o + 1)
class _LiteDRAMBISTGenerator(Module): class _LiteDRAMBISTGenerator(Module):
def __init__(self, dram_port): def __init__(self, dram_port, random):
self.shoot = Signal() self.shoot = Signal()
self.done = Signal() self.done = Signal()
self.base = Signal(dram_port.aw) self.base = Signal(dram_port.aw)
@ -41,7 +51,10 @@ class _LiteDRAMBISTGenerator(Module):
self.submodules.dma = dma = LiteDRAMDMAWriter(dram_port) self.submodules.dma = dma = LiteDRAMDMAWriter(dram_port)
self.submodules.lfsr = lfsr = LFSR(dram_port.dw) if random:
self.submodules.gen = gen = LFSR(dram_port.dw)
else:
self.submodules.gen = gen = Counter(dram_port.dw)
shooted = Signal() shooted = Signal()
enable = Signal() enable = Signal()
@ -51,7 +64,7 @@ class _LiteDRAMBISTGenerator(Module):
If(self.shoot, If(self.shoot,
shooted.eq(1), shooted.eq(1),
counter.eq(0) counter.eq(0)
).Elif(lfsr.ce, ).Elif(gen.ce,
counter.eq(counter + 1) counter.eq(counter + 1)
) )
] ]
@ -59,15 +72,15 @@ class _LiteDRAMBISTGenerator(Module):
self.comb += [ self.comb += [
dma.sink.valid.eq(enable), dma.sink.valid.eq(enable),
dma.sink.address.eq(self.base + counter), dma.sink.address.eq(self.base + counter),
dma.sink.data.eq(lfsr.o), dma.sink.data.eq(gen.o),
lfsr.ce.eq(enable & dma.sink.ready), gen.ce.eq(enable & dma.sink.ready),
self.done.eq(~enable) self.done.eq(~enable)
] ]
class LiteDRAMBISTGenerator(Module, AutoCSR): class LiteDRAMBISTGenerator(Module, AutoCSR):
def __init__(self, dram_port): def __init__(self, dram_port, random=True):
self.reset = CSRStorage() self.reset = CSRStorage()
self.shoot = CSR() self.shoot = CSR()
self.done = CSRStatus() self.done = CSRStatus()
@ -78,7 +91,7 @@ class LiteDRAMBISTGenerator(Module, AutoCSR):
cd = dram_port.cd cd = dram_port.cd
core = ResetInserter()(_LiteDRAMBISTGenerator(dram_port)) core = ResetInserter()(_LiteDRAMBISTGenerator(dram_port, random))
self.submodules.core = ClockDomainsRenamer(cd)(core) self.submodules.core = ClockDomainsRenamer(cd)(core)
reset_sync = BusSynchronizer(1, "sys", cd) reset_sync = BusSynchronizer(1, "sys", cd)
@ -109,7 +122,7 @@ class LiteDRAMBISTGenerator(Module, AutoCSR):
class _LiteDRAMBISTChecker(Module, AutoCSR): class _LiteDRAMBISTChecker(Module, AutoCSR):
def __init__(self, dram_port): def __init__(self, dram_port, random):
self.shoot = Signal() self.shoot = Signal()
self.done = Signal() self.done = Signal()
self.base = Signal(dram_port.aw) self.base = Signal(dram_port.aw)
@ -120,7 +133,10 @@ class _LiteDRAMBISTChecker(Module, AutoCSR):
self.submodules.dma = dma = LiteDRAMDMAReader(dram_port) self.submodules.dma = dma = LiteDRAMDMAReader(dram_port)
self.submodules.lfsr = lfsr = LFSR(dram_port.dw) if random:
self.submodules.gen = gen = LFSR(dram_port.dw)
else:
self.submodules.gen = gen = Counter(dram_port.dw)
shooted = Signal() shooted = Signal()
address_counter = Signal(dram_port.aw) address_counter = Signal(dram_port.aw)
@ -156,12 +172,12 @@ class _LiteDRAMBISTChecker(Module, AutoCSR):
self.comb += data_enable.eq(shooted & (data_counter != (self.length - 1))) self.comb += data_enable.eq(shooted & (data_counter != (self.length - 1)))
self.comb += [ self.comb += [
lfsr.ce.eq(dma.source.valid), gen.ce.eq(dma.source.valid),
dma.source.ready.eq(1) dma.source.ready.eq(1)
] ]
self.sync += \ self.sync += \
If(dma.source.valid, If(dma.source.valid,
If(dma.source.data != lfsr.o, If(dma.source.data != gen.o,
self.error_count.eq(self.error_count + 1) self.error_count.eq(self.error_count + 1)
) )
) )
@ -171,7 +187,7 @@ class _LiteDRAMBISTChecker(Module, AutoCSR):
class LiteDRAMBISTChecker(Module, AutoCSR): class LiteDRAMBISTChecker(Module, AutoCSR):
def __init__(self, dram_port): def __init__(self, dram_port, random=True):
self.reset = CSRStorage() self.reset = CSRStorage()
self.shoot = CSR() self.shoot = CSR()
self.done = CSRStatus() self.done = CSRStatus()
@ -183,7 +199,7 @@ class LiteDRAMBISTChecker(Module, AutoCSR):
cd = dram_port.cd cd = dram_port.cd
core = ResetInserter()(_LiteDRAMBISTChecker(dram_port)) core = ResetInserter()(_LiteDRAMBISTChecker(dram_port, random))
self.submodules.core = ClockDomainsRenamer(cd)(core) self.submodules.core = ClockDomainsRenamer(cd)(core)
reset_sync = BusSynchronizer(1, "sys", cd) reset_sync = BusSynchronizer(1, "sys", cd)