From: Florent Kermarrec <florent@enjoy-digital.fr>
Date: Mon, 24 Sep 2018 20:49:30 +0000 (+0200)
Subject: targets/arty: use new clock abstraction module (compile, untested on board)
X-Git-Tag: 24jan2021_ls180~1586
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=5415b521befa5782cc41a733e313a707ee3b251f;p=litex.git

targets/arty: use new clock abstraction module (compile, untested on board)
---

diff --git a/litex/boards/targets/arty.py b/litex/boards/targets/arty.py
index 021d2678..bdd8bfa0 100755
--- a/litex/boards/targets/arty.py
+++ b/litex/boards/targets/arty.py
@@ -3,10 +3,10 @@
 import argparse
 
 from migen import *
-from migen.genlib.resetsync import AsyncResetSynchronizer
 
 from litex.boards.platforms import arty
 
+from litex.soc.cores.clock import *
 from litex.soc.integration.soc_core import mem_decoder
 from litex.soc.integration.soc_sdram import *
 from litex.soc.integration.builder import *
@@ -19,75 +19,24 @@ from liteeth.core.mac import LiteEthMAC
 
 
 class _CRG(Module):
-    def __init__(self, platform):
+    def __init__(self, platform, sys_clk_freq):
         self.clock_domains.cd_sys = ClockDomain()
         self.clock_domains.cd_sys4x = ClockDomain(reset_less=True)
         self.clock_domains.cd_sys4x_dqs = ClockDomain(reset_less=True)
         self.clock_domains.cd_clk200 = ClockDomain()
-        self.clock_domains.cd_clk50 = ClockDomain()
-
-        clk100 = platform.request("clk100")
-        rst = ~platform.request("cpu_reset")
-
-        pll_locked = Signal()
-        pll_fb = Signal()
-        pll_sys = Signal()
-        pll_sys4x = Signal()
-        pll_sys4x_dqs = Signal()
-        pll_clk200 = Signal()
-        pll_clk50 = Signal()
-        self.specials += [
-            Instance("PLLE2_BASE",
-                     p_STARTUP_WAIT="FALSE", o_LOCKED=pll_locked,
-
-                     # VCO @ 1600 MHz
-                     p_REF_JITTER1=0.01, p_CLKIN1_PERIOD=10.0,
-                     p_CLKFBOUT_MULT=16, p_DIVCLK_DIVIDE=1,
-                     i_CLKIN1=clk100, i_CLKFBIN=pll_fb, o_CLKFBOUT=pll_fb,
-
-                     # 100 MHz
-                     p_CLKOUT0_DIVIDE=16, p_CLKOUT0_PHASE=0.0,
-                     o_CLKOUT0=pll_sys,
-
-                     # 400 MHz
-                     p_CLKOUT1_DIVIDE=4, p_CLKOUT1_PHASE=0.0,
-                     o_CLKOUT1=pll_sys4x,
-
-                     # 400 MHz dqs
-                     p_CLKOUT2_DIVIDE=4, p_CLKOUT2_PHASE=90.0,
-                     o_CLKOUT2=pll_sys4x_dqs,
-
-                     # 200 MHz
-                     p_CLKOUT3_DIVIDE=8, p_CLKOUT3_PHASE=0.0,
-                     o_CLKOUT3=pll_clk200,
-
-                     # 50MHz
-                     p_CLKOUT4_DIVIDE=32, p_CLKOUT4_PHASE=0.0,
-                     o_CLKOUT4=pll_clk50
-            ),
-            Instance("BUFG", i_I=pll_sys, o_O=self.cd_sys.clk),
-            Instance("BUFG", i_I=pll_sys4x, o_O=self.cd_sys4x.clk),
-            Instance("BUFG", i_I=pll_sys4x_dqs, o_O=self.cd_sys4x_dqs.clk),
-            Instance("BUFG", i_I=pll_clk200, o_O=self.cd_clk200.clk),
-            Instance("BUFG", i_I=pll_clk50, o_O=self.cd_clk50.clk),
-            AsyncResetSynchronizer(self.cd_sys, ~pll_locked | rst),
-            AsyncResetSynchronizer(self.cd_clk200, ~pll_locked | rst),
-            AsyncResetSynchronizer(self.cd_clk50, ~pll_locked | rst),
-        ]
 
-        reset_counter = Signal(4, reset=15)
-        ic_reset = Signal(reset=1)
-        self.sync.clk200 += \
-            If(reset_counter != 0,
-                reset_counter.eq(reset_counter - 1)
-            ).Else(
-                ic_reset.eq(0)
-            )
-        self.specials += Instance("IDELAYCTRL", i_REFCLK=ClockSignal("clk200"), i_RST=ic_reset)
+        self.submodules.pll = pll = S7PLL()
+        self.comb += pll.reset.eq(~platform.request("cpu_reset"))
+        pll.register_clkin(platform.request("clk100"), 100e6)
+        pll.create_clkout(self.cd_sys, sys_clk_freq)
+        pll.create_clkout(self.cd_sys4x, 4*sys_clk_freq)
+        pll.create_clkout(self.cd_sys4x, 4*sys_clk_freq, phase=90)
+        pll.create_clkout(self.cd_clk200, 200e6)
+        pll.add_idelayctrl(self.cd_clk200)
 
         eth_clk = Signal()
         self.specials += [
-            Instance("BUFR", p_BUFR_DIVIDE="4", i_CE=1, i_CLR=0, i_I=clk100, o_O=eth_clk),
+            Instance("BUFR", p_BUFR_DIVIDE="4", i_CE=1, i_CLR=0, i_I=self.cd_sys.clk, o_O=eth_clk),
             Instance("BUFG", i_I=eth_clk, o_O=platform.request("eth_ref_clk")),
         ]
 
@@ -105,7 +54,7 @@ class BaseSoC(SoCSDRAM):
                          integrated_sram_size=0x8000,
                          **kwargs)
 
-        self.submodules.crg = _CRG(platform)
+        self.submodules.crg = _CRG(platform, sys_clk_freq)
 
         # sdram
         self.submodules.ddrphy = s7ddrphy.A7DDRPHY(platform.request("ddram"), sys_clk_freq=sys_clk_freq)