From: Florent Kermarrec <florent@enjoy-digital.fr>
Date: Tue, 25 Sep 2018 06:35:50 +0000 (+0200)
Subject: soc/core/clock: allow selecting buffer type (None, BUFG, BUFR). (default = BUFG)
X-Git-Tag: 24jan2021_ls180~1582
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=6cd954940cd91d67a5d314efb413dfd05c440515;p=litex.git

soc/core/clock: allow selecting buffer type (None, BUFG, BUFR). (default = BUFG)
---

diff --git a/litex/soc/cores/clock.py b/litex/soc/cores/clock.py
index 766dd6f2..9ad5c52c 100644
--- a/litex/soc/cores/clock.py
+++ b/litex/soc/cores/clock.py
@@ -45,16 +45,25 @@ class S7Clocking(Module):
             raise ValueError
         self.clkin_freq = freq
 
-    def create_clkout(self, cd, freq, phase=0):
+    def create_clkout(self, cd, freq, phase=0, buf="bufg"):
         assert self.nclkouts < self.nclkouts_max
         clkout = Signal()
-        clkout_bufg = Signal()
-        self.specials += AsyncResetSynchronizer(cd, ~self.locked | self.reset),
-        self.specials += Instance("BUFG", i_I=clkout, o_O=clkout_bufg)
-        self.comb += cd.clk.eq(clkout_bufg)
         self.clkouts[self.nclkouts] = (clkout, freq, phase)
         self.nclkouts += 1
-        return clkout_bufg
+        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
+
+        return clkout_buf
 
     def compute_config(self):
         config = {}