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cores/video/VideoS7GTPHDMIPHY: Add refclk support (None, Differential or Single-Ended).

This commit is contained in:
Florent Kermarrec 2021-05-06 10:50:29 +02:00
parent bfb90f5625
commit 3ce5f3867a
1 changed files with 16 additions and 2 deletions
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18
litex/soc/cores/video.py
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@ -858,7 +858,8 @@ class VideoS7HDMIPHY(Module):
class VideoS7GTPHDMIPHY(Module):
def __init__(self, pads, sys_clk_freq, clock_domain="sys"):
def __init__(self, pads, sys_clk_freq, clock_domain="sys", clk_freq=148.5e6, refclk=None):
assert sys_clk_freq >= clk_freq
self.sink = sink = stream.Endpoint(video_data_layout)
# # #
@ -874,7 +875,20 @@ class VideoS7GTPHDMIPHY(Module):
self.specials += Instance("OBUFDS", i_I=pads_clk, o_O=pads.clk_p, o_OB=pads.clk_n)
# GTP Quad PLL.
self.submodules.pll = pll = GTPQuadPLL(ClockSignal(clock_domain), 148.5e6, 1.485e9) # FIXME: 1080P60, allow other Video timings.
if refclk is None:
# No RefClk provided, use the Video Clk as GTP RefClk.
refclk = ClockSignal(clock_domain)
elif isinstance(refclk, Record):
# Differential RefCLk provided, add an IBUFDS_GTE2.
refclk_se = Signal()
self.specials += Instance("IBUFDS_GTE2",
i_CEB = 0,
i_I = refclk.p,
i_IB = refclk.n,
o_O = refclk_se
)
refclk = refclk_se
self.submodules.pll = pll = GTPQuadPLL(refclk, clk_freq, 1.485e9)
# Encode/Serialize Datas.
for color in ["r", "g", "b"]: