cores/clock: use common XilinxClocking class for all Xilinx clocking modules

This commit is contained in:
Florent Kermarrec 2019-04-23 06:35:39 +02:00
parent 83699ea0a5
commit 0d282f38f9
1 changed files with 51 additions and 156 deletions

View File

@ -10,9 +10,9 @@ from litex.soc.interconnect.csr import *
def period_ns(freq): def period_ns(freq):
return 1e9/freq return 1e9/freq
# Xilinx / 7-Series -------------------------------------------------------------------------------- # Xilinx / Generic ---------------------------------------------------------------------------------
class S7Clocking(Module, AutoCSR): class XilinxClocking(Module, AutoCSR):
clkfbout_mult_frange = (2, 64+1) clkfbout_mult_frange = (2, 64+1)
clkout_divide_range = (1, 128+1) clkout_divide_range = (1, 128+1)
@ -118,45 +118,14 @@ class S7Clocking(Module, AutoCSR):
def do_finalize(self): def do_finalize(self):
assert hasattr(self, "clkin") assert hasattr(self, "clkin")
# Xilinx / Spartan6 --------------------------------------------------------------------------------
class S7PLL(S7Clocking): class S6PLL(XilinxClocking):
nclkouts_max = 6
clkin_freq_range = (19e6, 800e6)
def __init__(self, speedgrade=-1):
S7Clocking.__init__(self)
self.divclk_divide_range = (1, 56+1)
self.vco_freq_range = {
-1: (800e6, 2133e6),
-2: (800e6, 1866e6),
-3: (800e6, 1600e6),
}[speedgrade]
def do_finalize(self):
S7Clocking.do_finalize(self)
config = self.compute_config()
pll_fb = Signal()
self.params.update(
p_STARTUP_WAIT="FALSE", o_LOCKED=self.locked,
# VCO
p_REF_JITTER1=0.01, p_CLKIN1_PERIOD=period_ns(self.clkin_freq),
p_CLKFBOUT_MULT=config["clkfbout_mult"], p_DIVCLK_DIVIDE=config["divclk_divide"],
i_CLKIN1=self.clkin, i_CLKFBIN=pll_fb, o_CLKFBOUT=pll_fb,
)
for n, (clk, f, p, m) in sorted(self.clkouts.items()):
self.params["p_CLKOUT{}_DIVIDE".format(n)] = config["clkout{}_divide".format(n)]
self.params["p_CLKOUT{}_PHASE".format(n)] = config["clkout{}_phase".format(n)]
self.params["o_CLKOUT{}".format(n)] = clk
self.specials += Instance("PLLE2_ADV", **self.params)
class S6PLL(S7Clocking):
nclkouts_max = 6 nclkouts_max = 6
clkin_freq_range = (19e6, 540e6) clkin_freq_range = (19e6, 540e6)
def __init__(self, speedgrade=-1): def __init__(self, speedgrade=-1):
S7Clocking.__init__(self) XilinxClocking.__init__(self)
self.vco_freq_range = { self.vco_freq_range = {
-1: (400e6, 1000e6), -1: (400e6, 1000e6),
-2: (400e6, 1000e6), -2: (400e6, 1000e6),
@ -164,7 +133,7 @@ class S6PLL(S7Clocking):
}[speedgrade] }[speedgrade]
def do_finalize(self): def do_finalize(self):
S7Clocking.do_finalize(self) XilinxClocking.do_finalize(self)
config = self.compute_config() config = self.compute_config()
pll_fb = Signal() pll_fb = Signal()
self.params.update( self.params.update(
@ -187,14 +156,14 @@ class S6PLL(S7Clocking):
self.specials += Instance("PLL_ADV", **self.params) self.specials += Instance("PLL_ADV", **self.params)
class S6DCM(S7Clocking): class S6DCM(XilinxClocking):
""" single output with f_out = f_in * {2 .. 256} / {1 .. 256} """ """ single output with f_out = f_in * {2 .. 256} / {1 .. 256} """
nclkouts_max = 1 nclkouts_max = 1
clkfbout_mult_frange = (2, 256 + 1) clkfbout_mult_frange = (2, 256 + 1)
clkout_divide_range = (1, 256 + 1) clkout_divide_range = (1, 256 + 1)
def __init__(self, speedgrade=-1): def __init__(self, speedgrade=-1):
S7Clocking.__init__(self) XilinxClocking.__init__(self)
self.clkin_freq_range = { self.clkin_freq_range = {
-1: (0.5e6, 200e6), -1: (0.5e6, 200e6),
-2: (0.5e6, 333e6), -2: (0.5e6, 333e6),
@ -208,7 +177,7 @@ class S6DCM(S7Clocking):
}[speedgrade] }[speedgrade]
def do_finalize(self): def do_finalize(self):
S7Clocking.do_finalize(self) XilinxClocking.do_finalize(self)
config = self.compute_config() config = self.compute_config()
clk, f, p, m = sorted(self.clkouts.items())[0][1] clk, f, p, m = sorted(self.clkouts.items())[0][1]
self.params.update( self.params.update(
@ -224,12 +193,45 @@ class S6DCM(S7Clocking):
) )
self.specials += Instance("DCM_CLKGEN", **self.params) self.specials += Instance("DCM_CLKGEN", **self.params)
# Xilinx / 7-Series --------------------------------------------------------------------------------
class S7MMCM(S7Clocking): class S7PLL(XilinxClocking):
nclkouts_max = 6
clkin_freq_range = (19e6, 800e6)
def __init__(self, speedgrade=-1):
XilinxClocking.__init__(self)
self.divclk_divide_range = (1, 56+1)
self.vco_freq_range = {
-1: (800e6, 2133e6),
-2: (800e6, 1866e6),
-3: (800e6, 1600e6),
}[speedgrade]
def do_finalize(self):
XilinxClocking.do_finalize(self)
config = self.compute_config()
pll_fb = Signal()
self.params.update(
p_STARTUP_WAIT="FALSE", o_LOCKED=self.locked,
# VCO
p_REF_JITTER1=0.01, p_CLKIN1_PERIOD=period_ns(self.clkin_freq),
p_CLKFBOUT_MULT=config["clkfbout_mult"], p_DIVCLK_DIVIDE=config["divclk_divide"],
i_CLKIN1=self.clkin, i_CLKFBIN=pll_fb, o_CLKFBOUT=pll_fb,
)
for n, (clk, f, p, m) in sorted(self.clkouts.items()):
self.params["p_CLKOUT{}_DIVIDE".format(n)] = config["clkout{}_divide".format(n)]
self.params["p_CLKOUT{}_PHASE".format(n)] = config["clkout{}_phase".format(n)]
self.params["o_CLKOUT{}".format(n)] = clk
self.specials += Instance("PLLE2_ADV", **self.params)
class S7MMCM(XilinxClocking):
nclkouts_max = 7 nclkouts_max = 7
def __init__(self, speedgrade=-1): def __init__(self, speedgrade=-1):
S7Clocking.__init__(self) XilinxClocking.__init__(self)
self.divclk_divide_range = (1, 106+1) self.divclk_divide_range = (1, 106+1)
self.clkin_freq_range = { self.clkin_freq_range = {
-1: (10e6, 800e6), -1: (10e6, 800e6),
@ -244,7 +246,7 @@ class S7MMCM(S7Clocking):
}[speedgrade] }[speedgrade]
def do_finalize(self): def do_finalize(self):
S7Clocking.do_finalize(self) XilinxClocking.do_finalize(self)
config = self.compute_config() config = self.compute_config()
mmcm_fb = Signal() mmcm_fb = Signal()
self.params.update( self.params.update(
@ -283,118 +285,11 @@ class S7IDELAYCTRL(Module):
# TODO: # TODO:
# - use Ultrascale primitives instead of 7-Series' ones. (Vivado recognize and convert them). # - use Ultrascale primitives instead of 7-Series' ones. (Vivado recognize and convert them).
class USClocking(Module, AutoCSR): class USPLL(XilinxClocking):
clkfbout_mult_frange = (2, 64+1)
clkout_divide_range = (1, 128+1)
def __init__(self, vco_margin=0):
self.vco_margin = vco_margin
self.reset = Signal()
self.locked = Signal()
self.clkin_freq = None
self.vcxo_freq = None
self.nclkouts = 0
self.clkouts = {}
self.config = {}
self.params = {}
def register_clkin(self, clkin, freq):
self.clkin = Signal()
if isinstance(clkin, (Signal, ClockSignal)):
self.comb += self.clkin.eq(clkin)
elif isinstance(clkin, Record):
self.specials += DifferentialInput(clkin.p, clkin.n, self.clkin)
else:
raise ValueError
self.clkin_freq = freq
def create_clkout(self, cd, freq, phase=0, buf="bufg", margin=1e-2, with_reset=True):
assert self.nclkouts < self.nclkouts_max
clkout = Signal()
self.clkouts[self.nclkouts] = (clkout, freq, phase, margin)
self.nclkouts += 1
if with_reset:
self.specials += AsyncResetSynchronizer(cd, ~self.locked | self.reset)
if buf is None:
self.comb += cd.clk.eq(clkout)
else:
clkout_buf = Signal()
self.comb += cd.clk.eq(clkout_buf)
if buf == "bufg":
self.specials += Instance("BUFG", i_I=clkout, o_O=clkout_buf)
elif buf == "bufr":
self.specials += Instance("BUFR", i_I=clkout, o_O=clkout_buf)
else:
raise ValueError
def compute_config(self):
config = {}
for divclk_divide in range(*self.divclk_divide_range):
config["divclk_divide"] = divclk_divide
for clkfbout_mult in range(*self.clkfbout_mult_frange):
all_valid = True
vco_freq = self.clkin_freq*clkfbout_mult/divclk_divide
(vco_freq_min, vco_freq_max) = self.vco_freq_range
if (vco_freq >= vco_freq_min*(1 + self.vco_margin) and
vco_freq <= vco_freq_max*(1 - self.vco_margin)):
for n, (clk, f, p, m) in sorted(self.clkouts.items()):
valid = False
for d in range(*self.clkout_divide_range):
clk_freq = vco_freq/d
if abs(clk_freq - f) < f*m:
config["clkout{}_freq".format(n)] = clk_freq
config["clkout{}_divide".format(n)] = d
config["clkout{}_phase".format(n)] = p
valid = True
break
if not valid:
all_valid = False
else:
all_valid = False
if all_valid:
config["vco"] = vco_freq
config["clkfbout_mult"] = clkfbout_mult
return config
raise ValueError("No PLL config found")
def expose_drp(self):
self.drp_reset = CSR()
self.drp_read = CSR()
self.drp_write = CSR()
self.drp_drdy = CSRStatus()
self.drp_adr = CSRStorage(7)
self.drp_dat_w = CSRStorage(16)
self.drp_dat_r = CSRStatus(16)
# # #
drp_drdy = Signal()
self.params.update(
i_DCLK=ClockSignal(),
i_DWE=self.drp_write.re,
i_DEN=self.drp_read.re | self.drp_write.re,
o_DRDY=drp_drdy,
i_DADDR=self.drp_adr.storage,
i_DI=self.drp_dat_w.storage,
o_DO=self.drp_dat_r.status
)
self.sync += [
If(self.drp_read.re | self.drp_write.re,
self.drp_drdy.status.eq(0)
).Elif(drp_drdy,
self.drp_drdy.status.eq(1)
)
]
def do_finalize(self):
assert hasattr(self, "clkin")
class USPLL(USClocking):
nclkouts_max = 6 nclkouts_max = 6
def __init__(self, speedgrade=-1): def __init__(self, speedgrade=-1):
USClocking.__init__(self) XilinxClocking.__init__(self)
self.divclk_divide_range = (1, 56+1) self.divclk_divide_range = (1, 56+1)
self.clkin_freq_range = { self.clkin_freq_range = {
-1: (70e6, 800e6), -1: (70e6, 800e6),
@ -408,7 +303,7 @@ class USPLL(USClocking):
}[speedgrade] }[speedgrade]
def do_finalize(self): def do_finalize(self):
USClocking.do_finalize(self) XilinxClocking.do_finalize(self)
config = self.compute_config() config = self.compute_config()
pll_fb = Signal() pll_fb = Signal()
self.params.update( self.params.update(
@ -426,11 +321,11 @@ class USPLL(USClocking):
self.specials += Instance("PLLE2_ADV", **self.params) self.specials += Instance("PLLE2_ADV", **self.params)
class USMMCM(USClocking): class USMMCM(XilinxClocking):
nclkouts_max = 7 nclkouts_max = 7
def __init__(self, speedgrade=-1): def __init__(self, speedgrade=-1):
USClocking.__init__(self) XilinxClocking.__init__(self)
self.divclk_divide_range = (1, 106+1) self.divclk_divide_range = (1, 106+1)
self.clkin_freq_range = { self.clkin_freq_range = {
-1: (10e6, 800e6), -1: (10e6, 800e6),
@ -444,7 +339,7 @@ class USMMCM(USClocking):
}[speedgrade] }[speedgrade]
def do_finalize(self): def do_finalize(self):
USClocking.do_finalize(self) XilinxClocking.do_finalize(self)
config = self.compute_config() config = self.compute_config()
mmcm_fb = Signal() mmcm_fb = Signal()
self.params.update( self.params.update(