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norflash: use new timeline API
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Sebastien Bourdeauducq
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Mar 15, 2012
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Original file line number | Diff line number | Diff line change |
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@@ -1,28 +1,31 @@ | ||
from migen.fhdl.structure import * | ||
from migen.bus import wishbone | ||
from migen.corelogic import timeline | ||
from migen.corelogic.misc import timeline | ||
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||
class NorFlash: | ||
def __init__(self, adr_width, rd_timing): | ||
self.adr_width = adr_width | ||
self.rd_timing = rd_timing | ||
|
||
self.bus = wishbone.Interface() | ||
self.adr = Signal(BV(adr_width-1)) | ||
self.d = Signal(BV(16)) | ||
self.oe_n = Signal() | ||
self.we_n = Signal() | ||
self.ce_n = Signal() | ||
self.timeline = timeline.Timeline(self.bus.cyc & self.bus.stb, | ||
[(0, [self.adr.eq(Cat(0, self.bus.adr[:adr_width-2]))]), | ||
(rd_timing, [ | ||
self.bus.dat_r[16:].eq(self.d), | ||
self.adr.eq(Cat(1, self.bus.adr[:adr_width-2]))]), | ||
(2*rd_timing, [ | ||
self.bus.dat_r[:16].eq(self.d), | ||
self.bus.ack.eq(1)]), | ||
(2*rd_timing+1, [ | ||
self.bus.ack.eq(0)])]) | ||
|
||
def get_fragment(self): | ||
comb = [self.oe_n.eq(0), self.we_n.eq(1), | ||
self.ce_n.eq(0)] | ||
return Fragment(comb, pads={self.adr, self.d, self.oe_n, self.we_n, self.ce_n}) \ | ||
+ self.timeline.get_fragment() | ||
sync = timeline(self.bus.cyc & self.bus.stb, [ | ||
(0, [self.adr.eq(Cat(0, self.bus.adr[:self.adr_width-2]))]), | ||
(self.rd_timing, [ | ||
self.bus.dat_r[16:].eq(self.d), | ||
self.adr.eq(Cat(1, self.bus.adr[:self.adr_width-2]))]), | ||
(2*self.rd_timing, [ | ||
self.bus.dat_r[:16].eq(self.d), | ||
self.bus.ack.eq(1)]), | ||
(2*self.rd_timing + 1, [ | ||
self.bus.ack.eq(0)]) | ||
]) | ||
return Fragment(comb, sync, pads={self.adr, self.d, self.oe_n, self.we_n, self.ce_n}) |