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extract main clock signal from SYSCRG

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This commit is contained in:
mwojcik 2023-01-12 16:39:22 +08:00
parent 2cb4285a37
commit c7e409520a
2 changed files with 34 additions and 14 deletions
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24
src/gateware/kasli_soc.py
View File

@ -26,20 +26,11 @@ import acpki
import drtio_aux_controller
class SYSCRG(Module, AutoCSR):
def __init__(self, platform):
def __init__(self, platform, main_clk):
self.pll_locked = CSRStatus()
self.clock_domains.cd_sys = ClockDomain()
self.clock_domains.cd_sys4x = ClockDomain(reset_less=True)
clk_synth = platform.request("cdr_clk_clean_fabric")
clk_synth_se = Signal()
platform.add_period_constraint(clk_synth.p, 8.0)
self.specials += [
Instance("IBUFGDS",
p_DIFF_TERM="TRUE", p_IBUF_LOW_PWR="FALSE",
i_I=clk_synth.p, i_IB=clk_synth.n, o_O=clk_synth_se),
]
pll_locked = Signal()
sys_clk = Signal()
sys4x_clk = Signal()
@ -50,7 +41,7 @@ class SYSCRG(Module, AutoCSR):
p_BANDWIDTH="HIGH",
p_REF_JITTER1=0.001,
p_CLKIN1_PERIOD=8.0,
i_CLKIN1=clk_synth_se,
i_CLKIN1=main_clk,
i_CLKINSEL=1,
# VCO @ 1.5GHz when using 125MHz input
@ -128,8 +119,17 @@ class GenericStandalone(SoCCore):
self.rustc_cfg["has_si5324"] = None
self.rustc_cfg["si5324_soft_reset"] = None
clk_synth = platform.request("cdr_clk_clean_fabric")
clk_synth_se = Signal()
platform.add_period_constraint(clk_synth.p, 8.0)
self.specials += [
Instance("IBUFGDS",
p_DIFF_TERM="TRUE", p_IBUF_LOW_PWR="FALSE",
i_I=clk_synth.p, i_IB=clk_synth.n, o_O=clk_synth_se),
]
self.crg = self.ps7 # HACK for eem_7series to find the clock
self.submodules.sys_crg = SYSCRG(self.platform)
self.submodules.sys_crg = SYSCRG(self.platform, clk_synth_se)
self.csr_devices.append("sys_crg")
# another hack since ps7 itself does not have cd_sys anymore
self.crg.cd_sys = self.sys_crg.cd_sys

24
src/gateware/zc706.py
View File

@ -28,7 +28,7 @@ import drtio_aux_controller
class SYSCRG(Module, AutoCSR):
def __init__(self, platform):
def __init__(self, platform, main_clk):
self.pll_locked = CSRStatus()
self.clock_domains.cd_sys = ClockDomain()
self.clock_domains.cd_sys4x = ClockDomain(reset_less=True)
@ -148,7 +148,27 @@ class ZC706(SoCCore):
ident = "acpki_" + ident
SoCCore.__init__(self, platform=platform, csr_data_width=32, ident=ident, ps_cd_sys=False)
self.submodules.sys_crg = SYSCRG(self.platform)
platform.add_extension(si5324_fmc33)
self.comb += platform.request("si5324_33").rst_n.eq(1)
cdr_clk = Signal()
cdr_clk_buf = Signal()
si5324_out = platform.request("si5324_clkout")
platform.add_period_constraint(si5324_out.p, 8.0)
self.specials += [
Instance("IBUFDS_GTE2",
i_I=si5324_out.p, i_IB=si5324_out.n,
o_O=cdr_clk,
p_CLKCM_CFG="0b1",
p_CLKRCV_TRST="0b1",
p_CLKSWING_CFG="0b11"),
Instance("BUFG", i_I=cdr_clk, o_O=cdr_clk_buf)
]
self.rustc_cfg["has_si5324"] = None
self.rustc_cfg["si5324_as_synthesizer"] = None
self.rustc_cfg["si5324_soft_reset"] = None
self.submodules.sys_crg = SYSCRG(self.platform, cdr_clk_buf)
self.csr_devices.append("sys_crg")
self.platform.add_period_constraint(self.sys_crg.cd_sys.clk, 8.)