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lpddr5: wck sync at every transaction 

Signed-off-by: Alessandro Comodi <acomodi@antmicro.com>
This commit is contained in:
Alessandro Comodi 2021-08-24 17:32:06 +02:00
parent 95be0be69d
commit c9954744df
2 changed files with 19 additions and 5 deletions
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2
litedram/init.py
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@ -704,7 +704,7 @@ def get_lpddr5_phy_init_sequence(phy_settings, timing_settings):
mr[18] = reg([
(0, 3, rzq_map[wck_odt]),
(3, 1, 0), # WCK low frequency mode
(4, 1, 1), # WCK always on mode enabled
(4, 1, 0), # WCK always on mode enabled
(6, 1, 0), # WCK2CK leveling diabled
(7, 1, {2: 1, 4: 0}[wck_ck_ratio]),
])

22
litedram/phy/lpddr5/basephy.py
View File

@ -121,7 +121,6 @@ def get_frange(twck, wck_ck_ratio):
return frange
raise ValueError
class LPDDR5PHY(Module, AutoCSR):
"""Core logic of LPDDR5 PHY
@ -295,9 +294,6 @@ class LPDDR5PHY(Module, AutoCSR):
# WL = tWCKENL_WR - 1 + tWCKPRE_Static + tWCKPRE_Toggle_WR
# RL = tWCKENL_RD - 1 + tWCKPRE_Static + tWCKPRE_Toggle_RD (without Byte Mode, nor Read DBI/Read Data Copy)
wck_sync_done = Signal()
self.sync += If(self.adapter.wck_sync != 0, wck_sync_done.eq(1))
self.comb += self.adapter.wck_sync_done.eq(wck_sync_done)
wck_sync = TappedDelayLine(
signal = self.adapter.wck_sync,
ntaps = max(1, max(frange.t_wckenl_wr, frange.t_wckenl_rd) + frange.t_wckpre_static),
@ -428,6 +424,24 @@ class LPDDR5PHY(Module, AutoCSR):
self.dfi.p0.rddata_valid.eq(rddata_converter.source.valid),
]
self.wck_sync_state = Signal(2)
self.sync += If(self.adapter.wck_sync != 0,
wck_sync_done.eq(1),
self.wck_sync_state.eq(self.adapter.wck_sync)
).Elif(self.wck_sync_state == WCKSyncType.RD,
If(reduce(or_, rddata_en.taps[0:rddata_start+burst_ck_cycles]) == 0,
wck_sync_done.eq(0),
self.wck_sync_state.eq(0b00),
)
).Elif(self.wck_sync_state == WCKSyncType.WR,
If(reduce(or_, wrdata_en.taps[0:wrtap+burst_ck_cycles]) == 0,
wck_sync_done.eq(0),
self.wck_sync_state.eq(0b00),
)
)
self.comb += self.adapter.wck_sync_done.eq(wck_sync_done)
for bit in range(self.databits):
# output
wrdata = [wrdata_ck[i * self.databits + bit] for i in range(2*wck_ck_ratio)]