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core/refresher: reduce RefreshGenerator start delay by 1 cycle

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This commit is contained in:
Florent Kermarrec 2019-07-24 08:01:54 +02:00
parent b543286d06
commit afb6d0a15e
2 changed files with 6 additions and 6 deletions
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6
litedram/core/refresher.py
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@ -31,17 +31,17 @@ class RefreshGenerator(Module):
# Wait start # Wait start
timeline(self.start, [ timeline(self.start, [
# Precharge all # Precharge all
(1, [ (0, [
cmd.ras.eq(1), cmd.ras.eq(1),
cmd.we.eq(1) cmd.we.eq(1)
]), ]),
# Wait tRP then Auto Refresh # Wait tRP then Auto Refresh
(1 + trp, [ (trp, [
cmd.cas.eq(1), cmd.cas.eq(1),
cmd.ras.eq(1) cmd.ras.eq(1)
]), ]),
# Wait tRFC then done # Wait tRFC then done
(1 + trp + trfc, [ (trp + trfc, [
self.done.eq(1) self.done.eq(1)
]) ])
]) ])

6
test/test_refresh.py
View file

@ -36,9 +36,9 @@ class TestRefresh(unittest.TestCase):
class Obj: pass class Obj: pass
cmds = Obj() cmds = Obj()
starts = "_-______________" starts = "_-______________"
cmds.cas = "____-___________" cmds.cas = "___-____________"
cmds.ras = "___--___________" cmds.ras = "__--____________"
dones = "______-_________" dones = "_____-__________"
self.refresh_generator_test(trp, trfc, starts, dones, cmds) self.refresh_generator_test(trp, trfc, starts, dones, cmds)
def refresh_timer_test(self, trefi): def refresh_timer_test(self, trefi):