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kasli-soc: fix of SYS CLK switch failure

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Change initialization behaviour of GTX transceivers
--
Modify the config parms CPLL of GTX transceiver for PLL to lock correctly
Modify the enabling requirement of GTX input clock buffer IBUFDS_GTE2 so
    that it depends on GTX PLL locked signal instead of TX Init Done
Modify the GTX Init FSM so that BruteForceClock Aligner can reset GTX
    transceiver without resetting the GTX transceiver PLL

kasli-soc: fix of SYS CLK switch failure
Changed initialization of GTX transceivers.
Successful SYS CLK switching requires IBUFDS_GTE2 to be properly enabled and not disabled during GTX transceiver initialization.
For this reason, CPLL is not reset during GTX initialization and clock alignment.

kasli-soc: refractor fix of SYS CLK switch failure
Remove gtXxreset & cpllreset assertion and deassertion
The removed code does not affect the fix
This commit is contained in:
Denis Ovchinnikov 2023-06-27 13:10:33 +08:00 committed by Sébastien Bourdeauducq
parent 7ca02a119d
commit 93882eb3ce
2 changed files with 12 additions and 5 deletions
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4
artiq/gateware/drtio/transceiver/gtx_7series.py
View File

@ -74,6 +74,8 @@ class GTX_20X(Module):
p_CPLL_REFCLK_DIV=1,
p_RXOUT_DIV=2,
p_TXOUT_DIV=2,
p_CPLL_INIT_CFG=0x00001E,
p_CPLL_LOCK_CFG=0x01C0,
i_CPLLRESET=cpllreset,
i_CPLLPD=cpllreset,
o_CPLLLOCK=cplllock,
@ -320,7 +322,7 @@ class GTX(Module, TransceiverInterface):
# stable_clkin resets after reboot since it's in SYS domain
# still need to keep clk_enable high after this
self.sync.bootstrap += clk_enable.eq(self.stable_clkin.storage | self.gtxs[0].tx_init.done)
self.sync.bootstrap += clk_enable.eq(self.stable_clkin.storage | self.gtxs[0].tx_init.cplllock)
# Connect slave i's `rtio_rx` clock to `rtio_rxi` clock
for i in range(nchannels):

13
artiq/gateware/drtio/transceiver/gtx_7series_init.py
View File

@ -110,9 +110,9 @@ class GTXInit(Module):
startup_fsm.act("INITIAL",
startup_timer.wait.eq(1),
If(startup_timer.done & self.stable_clkin, NextState("RESET_ALL"))
If(startup_timer.done & self.stable_clkin, NextState("RESET_PLL"))
)
startup_fsm.act("RESET_ALL",
startup_fsm.act("RESET_PLL",
gtXxreset.eq(1),
self.cpllreset.eq(1),
pll_reset_timer.wait.eq(1),
@ -120,7 +120,12 @@ class GTXInit(Module):
)
startup_fsm.act("RELEASE_PLL_RESET",
gtXxreset.eq(1),
If(cplllock, NextState("RELEASE_GTH_RESET"))
If(cplllock, NextState("RESET_GTH"))
)
startup_fsm.act("RESET_GTH",
gtXxreset.eq(1),
pll_reset_timer.wait.eq(1),
If(pll_reset_timer.done, NextState("RELEASE_GTH_RESET"))
)
# Release GTX reset and wait for GTX resetdone
# (from UG476, GTX is reset on falling edge
@ -229,7 +234,7 @@ class GTXInit(Module):
startup_fsm.act("READY",
Xxuserrdy.eq(1),
self.done.eq(1),
If(self.restart, NextState("RESET_ALL"))
If(self.restart, NextState("RESET_GTH"))
)