From: Florent Kermarrec <florent@enjoy-digital.fr>
Date: Tue, 7 Apr 2020 15:00:40 +0000 (+0200)
Subject: targets/de0nano: use CycloneIVPLL, remove 50MHz limitation.
X-Git-Tag: 24jan2021_ls180~488
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=ab4906ea3b2a8be806e99b69849592e77158f3cf;p=litex.git

targets/de0nano: use CycloneIVPLL, remove 50MHz limitation.
---

diff --git a/litex/boards/targets/de0nano.py b/litex/boards/targets/de0nano.py
index edc020d7..91206fa2 100755
--- a/litex/boards/targets/de0nano.py
+++ b/litex/boards/targets/de0nano.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 
-# This file is Copyright (c) 2015-2019 Florent Kermarrec <florent@enjoy-digital.fr>
+# This file is Copyright (c) 2015-2020 Florent Kermarrec <florent@enjoy-digital.fr>
 # License: BSD
 
 import argparse
@@ -8,8 +8,9 @@ import argparse
 from migen import *
 from migen.genlib.resetsync import AsyncResetSynchronizer
 
-from litex_boards.platforms import de0nano
+from litex.boards.platforms import de0nano
 
+from litex.soc.cores.clock import CycloneIVPLL
 from litex.soc.integration.soc_core import *
 from litex.soc.integration.soc_sdram import *
 from litex.soc.integration.builder import *
@@ -20,7 +21,7 @@ from litedram.phy import GENSDRPHY
 # CRG ----------------------------------------------------------------------------------------------
 
 class _CRG(Module):
-    def __init__(self, platform):
+    def __init__(self, platform, sys_clk_freq):
         self.clock_domains.cd_sys    = ClockDomain()
         self.clock_domains.cd_sys_ps = ClockDomain(reset_less=True)
 
@@ -31,37 +32,10 @@ class _CRG(Module):
         platform.add_period_constraint(clk50, 1e9/50e6)
 
         # PLL
-        pll_locked  = Signal()
-        pll_clk_out = Signal(6)
-        self.specials += \
-            Instance("ALTPLL",
-                p_BANDWIDTH_TYPE         = "AUTO",
-                p_CLK0_DIVIDE_BY         = 1,
-                p_CLK0_DUTY_CYCLE        = 50,
-                p_CLK0_MULTIPLY_BY       = 1,
-                p_CLK0_PHASE_SHIFT       = "0",
-                p_CLK1_DIVIDE_BY         = 1,
-                p_CLK1_DUTY_CYCLE        = 50,
-                p_CLK1_MULTIPLY_BY       = 1,
-                p_CLK1_PHASE_SHIFT       = "5000", # 90°
-                p_COMPENSATE_CLOCK       = "CLK0",
-                p_INCLK0_INPUT_FREQUENCY = 20000,
-                p_OPERATION_MODE         = "NORMAL",
-                i_INCLK                  = clk50,
-                o_CLK                    = pll_clk_out,
-                i_ARESET                 = 0,
-                i_CLKENA                 = 0x3f,
-                i_EXTCLKENA              = 0xf,
-                i_FBIN                   = 1,
-                i_PFDENA                 = 1,
-                i_PLLENA                 = 1,
-                o_LOCKED                 = pll_locked,
-            )
-        self.comb += [
-            self.cd_sys.clk.eq(pll_clk_out[0]),
-            self.cd_sys_ps.clk.eq(pll_clk_out[1]),
-        ]
-        self.specials += AsyncResetSynchronizer(self.cd_sys, ~pll_locked)
+        self.submodules.pll = pll = CycloneIVPLL(speedgrade="-6")
+        pll.register_clkin(clk50, 50e6)
+        pll.create_clkout(self.cd_sys,    sys_clk_freq)
+        pll.create_clkout(self.cd_sys_ps, sys_clk_freq, phase=90)
 
         # SDRAM clock
         self.comb += platform.request("sdram_clock").eq(self.cd_sys_ps.clk)
@@ -70,14 +44,13 @@ class _CRG(Module):
 
 class BaseSoC(SoCCore):
     def __init__(self, sys_clk_freq=int(50e6), **kwargs):
-        assert sys_clk_freq == int(50e6)
         platform = de0nano.Platform()
 
         # SoCCore ----------------------------------------------------------------------------------
         SoCCore.__init__(self, platform, clk_freq=sys_clk_freq, **kwargs)
 
         # CRG --------------------------------------------------------------------------------------
-        self.submodules.crg = _CRG(platform)
+        self.submodules.crg = _CRG(platform, sys_clk_freq)
 
         # SDR SDRAM --------------------------------------------------------------------------------
         if not self.integrated_main_ram_size: