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soc/cores/hyperbus: Simplify/Rework Data Shift-Out Register.

This commit is contained in:
Florent Kermarrec 2024-08-20 11:34:14 +02:00
parent 9c1958d692
commit 3a53a92bb2
1 changed files with 7 additions and 4 deletions
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11
litex/soc/cores/hyperbus.py
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@ -121,7 +121,7 @@ class HyperRAM(LiteXModule):
if hasattr(pads, "clk"): if hasattr(pads, "clk"):
# Single Ended Clk. # Single Ended Clk.
self.comb += pads.clk.eq(clk) self.comb += pads.clk.eq(clk)
elif hastattr(pads, "clk_p"): elif hasattr(pads, "clk_p"):
# Differential Clk. # Differential Clk.
self.specials += DifferentialOutput(clk, pads.clk_p, pads.clk_n) self.specials += DifferentialOutput(clk, pads.clk_p, pads.clk_n)
else: else:
@ -146,7 +146,7 @@ class HyperRAM(LiteXModule):
# Command/Address: On 8-bit, so 8-bit shift and no input. # Command/Address: On 8-bit, so 8-bit shift and no input.
If(ca_oe, If(ca_oe,
sr_next[8:].eq(sr), sr_next[8:].eq(sr),
# Data: dw-bit shift. # Data: On dw-bit, so dw-bit shift.
).Else( ).Else(
sr_next[:dw].eq(dqi), sr_next[:dw].eq(dqi),
sr_next[dw:].eq(sr), sr_next[dw:].eq(sr),
@ -159,9 +159,12 @@ class HyperRAM(LiteXModule):
self.comb += [ self.comb += [
bus.dat_r.eq(sr_next), bus.dat_r.eq(sr_next),
If(dq_oe, If(dq_oe,
dq_o.eq(sr[-dw:]), # Command/Address: 8-bit.
If(ca_oe, If(ca_oe,
dq_o.eq(sr[-8:]) # Only use 8-bit for Command/Address. dq_o.eq(sr[-8:]),
# Data: dw-bit.
).Else(
dq_o.eq(sr[-dw:]),
) )
) )
] ]