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targets/colorlight_5a_75x: force use of internal oscillator when using Ethernet with 5A-75E V6.0

This commit is contained in:
DerFetzer 2020-09-01 16:54:01 +02:00
parent 8b1fee0e66
commit 24b853c2db
1 changed files with 33 additions and 18 deletions
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27
litex_boards/targets/colorlight_5a_75x.py
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@ -65,7 +65,7 @@ from liteeth.phy.ecp5rgmii import LiteEthPHYRGMII
# CRG ---------------------------------------------------------------------------------------------- # CRG ----------------------------------------------------------------------------------------------
class _CRG(Module): class _CRG(Module):
def __init__(self, platform, sys_clk_freq, with_usb_pll=False, with_rst=True, sdram_rate="1:1"): def __init__(self, platform, sys_clk_freq, use_internal_osc=False, with_usb_pll=False, with_rst=True, sdram_rate="1:1"):
self.clock_domains.cd_sys = ClockDomain() self.clock_domains.cd_sys = ClockDomain()
if sdram_rate == "1:2": if sdram_rate == "1:2":
self.clock_domains.cd_sys2x = ClockDomain() self.clock_domains.cd_sys2x = ClockDomain()
@ -76,13 +76,23 @@ class _CRG(Module):
# # # # # #
# Clk / Rst # Clk / Rst
clk25 = platform.request("clk25") if not use_internal_osc:
clk = platform.request("clk25")
clk_freq = 25e6
else:
clk = Signal()
div = 5
self.specials += Instance("OSCG",
p_DIV = div,
o_OSC = clk)
clk_freq = 310e6/div
rst_n = 1 if not with_rst else platform.request("user_btn_n", 0) rst_n = 1 if not with_rst else platform.request("user_btn_n", 0)
# PLL # PLL
self.submodules.pll = pll = ECP5PLL() self.submodules.pll = pll = ECP5PLL()
self.comb += pll.reset.eq(~rst_n) self.comb += pll.reset.eq(~rst_n)
pll.register_clkin(clk25, 25e6) pll.register_clkin(clk, clk_freq)
pll.create_clkout(self.cd_sys, sys_clk_freq) pll.create_clkout(self.cd_sys, sys_clk_freq)
if sdram_rate == "1:2": if sdram_rate == "1:2":
pll.create_clkout(self.cd_sys2x, 2*sys_clk_freq) pll.create_clkout(self.cd_sys2x, 2*sys_clk_freq)
@ -94,7 +104,7 @@ class _CRG(Module):
if with_usb_pll: if with_usb_pll:
self.submodules.usb_pll = usb_pll = ECP5PLL() self.submodules.usb_pll = usb_pll = ECP5PLL()
self.comb += usb_pll.reset.eq(~rst_n) self.comb += usb_pll.reset.eq(~rst_n)
usb_pll.register_clkin(clk25, 25e6) usb_pll.register_clkin(clk, clk_freq)
self.clock_domains.cd_usb_12 = ClockDomain() self.clock_domains.cd_usb_12 = ClockDomain()
self.clock_domains.cd_usb_48 = ClockDomain() self.clock_domains.cd_usb_48 = ClockDomain()
usb_pll.create_clkout(self.cd_usb_12, 12e6, margin=0) usb_pll.create_clkout(self.cd_usb_12, 12e6, margin=0)
@ -107,7 +117,7 @@ class _CRG(Module):
# BaseSoC ------------------------------------------------------------------------------------------ # BaseSoC ------------------------------------------------------------------------------------------
class BaseSoC(SoCCore): class BaseSoC(SoCCore):
def __init__(self, board, revision, with_ethernet=False, with_etherbone=False, sys_clk_freq=60e6, sdram_rate="1:1", **kwargs): def __init__(self, board, revision, with_ethernet=False, with_etherbone=False, sys_clk_freq=60e6, use_internal_osc=False, sdram_rate="1:1", **kwargs):
board = board.lower() board = board.lower()
assert board in ["5a-75b", "5a-75e"] assert board in ["5a-75b", "5a-75e"]
if board == "5a-75b": if board == "5a-75b":
@ -115,6 +125,9 @@ class BaseSoC(SoCCore):
elif board == "5a-75e": elif board == "5a-75e":
platform = colorlight_5a_75e.Platform(revision=revision) platform = colorlight_5a_75e.Platform(revision=revision)
if board == "5a-75e" and revision == "6.0" and (with_etherbone or with_ethernet):
assert use_internal_osc, "You cannot use the 25MHz clock as system clock since it is provided by the Ethernet PHY and will stop during PHY reset."
# SoCCore ---------------------------------------------------------------------------------- # SoCCore ----------------------------------------------------------------------------------
SoCCore.__init__(self, platform, sys_clk_freq, SoCCore.__init__(self, platform, sys_clk_freq,
ident = "LiteX SoC on Colorlight " + board.upper(), ident = "LiteX SoC on Colorlight " + board.upper(),
@ -124,7 +137,7 @@ class BaseSoC(SoCCore):
# CRG -------------------------------------------------------------------------------------- # CRG --------------------------------------------------------------------------------------
with_rst = kwargs["uart_name"] not in ["serial", "bridge"] # serial_rx shared with user_btn_n. with_rst = kwargs["uart_name"] not in ["serial", "bridge"] # serial_rx shared with user_btn_n.
with_usb_pll = kwargs.get("uart_name", None) == "usb_acm" with_usb_pll = kwargs.get("uart_name", None) == "usb_acm"
self.submodules.crg = _CRG(platform, sys_clk_freq, with_usb_pll=with_usb_pll,with_rst=with_rst, sdram_rate=sdram_rate) self.submodules.crg = _CRG(platform, sys_clk_freq, use_internal_osc=use_internal_osc, with_usb_pll=with_usb_pll,with_rst=with_rst, sdram_rate=sdram_rate)
# SDR SDRAM -------------------------------------------------------------------------------- # SDR SDRAM --------------------------------------------------------------------------------
if not self.integrated_main_ram_size: if not self.integrated_main_ram_size:
@ -172,6 +185,7 @@ def main():
parser.add_argument("--with-etherbone", action="store_true", help="Enable Etherbone support") parser.add_argument("--with-etherbone", action="store_true", help="Enable Etherbone support")
parser.add_argument("--eth-phy", default=0, type=int, help="Ethernet PHY 0 or 1 (default=0)") parser.add_argument("--eth-phy", default=0, type=int, help="Ethernet PHY 0 or 1 (default=0)")
parser.add_argument("--sys-clk-freq", default=60e6, type=float, help="System clock frequency (default=60MHz)") parser.add_argument("--sys-clk-freq", default=60e6, type=float, help="System clock frequency (default=60MHz)")
parser.add_argument("--use-internal-osc", action="store_true", help="Use internal oscillator")
parser.add_argument("--sdram-rate", default="1:1", help="SDRAM Rate 1:1 Full Rate (default), 1:2 Half Rate") parser.add_argument("--sdram-rate", default="1:1", help="SDRAM Rate 1:1 Full Rate (default), 1:2 Half Rate")
args = parser.parse_args() args = parser.parse_args()
@ -180,6 +194,7 @@ def main():
with_ethernet = args.with_ethernet, with_ethernet = args.with_ethernet,
with_etherbone = args.with_etherbone, with_etherbone = args.with_etherbone,
sys_clk_freq = args.sys_clk_freq, sys_clk_freq = args.sys_clk_freq,
use_internal_osc = args.use_internal_osc,
sdram_rate = args.sdram_rate, sdram_rate = args.sdram_rate,
**soc_core_argdict(args)) **soc_core_argdict(args))
builder = Builder(soc, **builder_argdict(args)) builder = Builder(soc, **builder_argdict(args))