srenblad
/
artiq
forked from M-Labs/artiq
1
0
Fork 0
Code Pull Requests Activity

drtio/transceiver/gth: implement tx multi lane phase alignment sequence (fix merge issue...)

This commit is contained in:
Florent Kermarrec 2018-02-23 08:37:05 +01:00
parent 820c834251
commit b4ba71c7a4
2 changed files with 26 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
artiq/gateware/drtio/transceiver/gth_ultrascale.py
View File

@ -44,10 +44,10 @@ class GTHSingle(Module):
# # #
# TX generates RTIO clock, init must be in system domain
tx_init = GTHInit(sys_clk_freq, False)
self.submodules.tx_init = tx_init = GTHInit(sys_clk_freq, False)
# RX receives restart commands from RTIO domain
rx_init = ClockDomainsRenamer("rtio_tx")(GTHInit(rtio_clk_freq, True))
self.submodules += tx_init, rx_init
self.submodules += rx_init
cpll_reset = Signal()
cpll_lock = Signal()
@ -297,7 +297,7 @@ class GTH(Module, TransceiverInterface):
mode = "single"
else:
mode = "master" if i == master else "slave"
gth = GTHSingle(plls[i], tx_pads[i], rx_pads[i], sys_clk_freq, dw, mode)
gth = GTHSingle(refclk, data_pads[i], sys_clk_freq, rtio_clk_freq, dw, mode)
if mode == "slave":
self.comb += gth.cd_rtio_tx.clk.eq(rtio_tx_clk)
else:

30
artiq/gateware/drtio/transceiver/gth_ultrascale_init.py
View File

@ -9,7 +9,8 @@ __all__ = ["GTHInit"]
class GTHInit(Module):
def __init__(self, sys_clk_freq, rx):
def __init__(self, sys_clk_freq, rx, mode="master"):
assert not (rx and mode != "master")
self.done = Signal()
self.restart = Signal()
@ -24,6 +25,9 @@ class GTHInit(Module):
self.Xxsyncdone = Signal()
self.Xxuserrdy = Signal()
self.all_ready_for_align = Signal(reset=1)
self.ready_for_align = Signal()
# # #
# Double-latch transceiver asynch outputs
@ -98,13 +102,21 @@ class GTHInit(Module):
else:
startup_fsm.act("RELEASE_GTH_RESET",
Xxuserrdy.eq(1),
If(Xxresetdone, NextState("ALIGN"))
If(Xxresetdone,
If(mode == "slave",
NextState("WAIT_ALIGN")
).Else(
NextState("ALIGN")
)
)
)
# Start delay alignment (pulse)
startup_fsm.act("ALIGN",
Xxuserrdy.eq(1),
Xxdlysreset.eq(1),
NextState("WAIT_ALIGN")
If(self.all_ready_for_align,
Xxdlysreset.eq(1),
NextState("WAIT_ALIGN")
)
)
if rx:
# Wait for delay alignment
@ -119,7 +131,11 @@ class GTHInit(Module):
startup_fsm.act("WAIT_ALIGN",
Xxuserrdy.eq(1),
If(Xxdlysresetdone,
NextState("WAIT_FIRST_ALIGN_DONE")
If(mode == "slave",
NextState("WAIT_LAST_ALIGN_DONE")
).Else(
NextState("WAIT_FIRST_ALIGN_DONE")
)
)
)
@ -127,9 +143,9 @@ class GTHInit(Module):
# (from UG576 in TX Buffer Bypass in Single-Lane Auto Mode)
startup_fsm.act("WAIT_FIRST_ALIGN_DONE",
Xxuserrdy.eq(1),
If(Xxphaligndone_rising, NextState("WAIT_SECOND_ALIGN_DONE"))
If(Xxphaligndone_rising, NextState("WAIT_LAST_ALIGN_DONE"))
)
startup_fsm.act("WAIT_SECOND_ALIGN_DONE",
startup_fsm.act("WAIT_LAST_ALIGN_DONE",
Xxuserrdy.eq(1),
If(Xxphaligndone_rising, NextState("READY"))
)