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soc/cores/prbs/PRBSRX: add pause signal to pause errors counting. 

Simplify CDC when passing the errors to software by allowing the values to stabilized.
This commit is contained in:
Florent Kermarrec 2020-11-28 11:33:57 +01:00
parent 869e50ade8
commit c491c60b7d
1 changed files with 2 additions and 1 deletions
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3
litex/soc/cores/prbs.py
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@ -132,6 +132,7 @@ class PRBS31Checker(PRBSChecker):
class PRBSRX(Module): class PRBSRX(Module):
def __init__(self, width, reverse=False): def __init__(self, width, reverse=False):
self.config = Signal(2) self.config = Signal(2)
self.pause = Signal()
self.i = Signal(width) self.i = Signal(width)
self.errors = Signal(32) self.errors = Signal(32)
@ -162,7 +163,7 @@ class PRBSRX(Module):
self.sync += [ self.sync += [
If(config == 0, If(config == 0,
self.errors.eq(0) self.errors.eq(0)
).Elif(self.errors != (2**32-1), ).Elif(~self.pause & (self.errors != (2**32-1)),
If(config == 0b01, If(config == 0b01,
self.errors.eq(self.errors + (prbs7.errors != 0)) self.errors.eq(self.errors + (prbs7.errors != 0))
).Elif(config == 0b10, ).Elif(config == 0b10,