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ddmtd: add collector

This commit is contained in:
Sebastien Bourdeauducq 2019-12-30 22:17:44 +08:00
parent 642a305c6a
commit 5c6e394928
2 changed files with 40 additions and 1 deletions

View File

@ -4,7 +4,7 @@ from migen.genlib.cdc import MultiReg, PulseSynchronizer
from misoc.interconnect.csr import *
from artiq.gateware.drtio.wrpll.si549 import Si549
from artiq.gateware.drtio.wrpll.ddmtd import DDMTD
from artiq.gateware.drtio.wrpll.ddmtd import DDMTD, Collector
from artiq.gateware.drtio.wrpll import thls, filters
@ -72,8 +72,27 @@ class WRPLL(Module, AutoCSR):
self.submodules.ddmtd_main = DDMTD(ddmtd_counter, ddmtd_inputs.main_xo)
helper_cd = ClockDomainsRenamer("helper")
self.submodules.collector = helper_cd(Collector(N))
self.submodules.filter_helper = helper_cd(thls.make(filters.helper, data_width=48))
self.submodules.filter_main = helper_cd(thls.make(filters.main, data_width=48))
self.comb += [
self.collector.tag_helper.eq(self.ddmtd_helper.h_tag),
self.collector.tag_helper_update.eq(self.ddmtd_helper.h_tag_update),
self.collector.tag_main.eq(self.ddmtd_main.h_tag),
self.collector.tag_main_update.eq(self.ddmtd_main.h_tag_update)
]
# compensate the 1 cycle latency of the collector
self.sync.helper += [
self.filter_helper.input.eq(self.ddmtd_helper.h_tag),
self.filter_helper.input_stb.eq(self.ddmtd_helper.h_tag_update)
]
self.comb += [
self.filter_main.input.eq(self.collector.output),
self.filter_main.input_stb.eq(self.collector.output_update)
]
self.comb += [
self.helper_dcxo.adpll_stb.eq(self.filter_helper.output_stb),
self.helper_dcxo.adpll.eq(self.filter_helper.output),

View File

@ -103,3 +103,23 @@ class DDMTD(Module, AutoCSR):
self.arm.w.eq(0),
)
]
class Collector(Module):
def __init__(self, N):
self.tag_helper = Signal(N)
self.tag_helper_update = Signal()
self.tag_main = Signal(N)
self.tag_main_update = Signal()
self.output = Signal(N)
self.output_update = Signal(N)
# # #
last_tag_main = Signal(N)
self.sync += [
If(self.tag_main_update, last_tag_main.eq(self.tag_main)),
self.output_update.eq(self.tag_helper_update),
self.output.eq(last_tag_main - self.tag_helper)
]