mark RTIO clock as asychronous to system clock

2020-07-08 20:37:53 +08:00 · 2020-07-08 20:37:53 +08:00 · 68045ce0c5
commit 68045ce0c5
parent 7ee67db8e3
1 changed files with 4 additions and 0 deletions
--- a/src/zc706.py
+++ b/src/zc706.py
@ -71,6 +71,10 @@ class ZC706(SoCCore):

        self.submodules.rtio_crg = RTIOCRG(self.platform, self.ps7.cd_sys.clk)
        self.csr_devices.append("rtio_crg")
+        self.platform.add_period_constraint(self.rtio_crg.cd_rtio.clk, 8.)
+        self.platform.add_false_path_constraints(
+            self.ps7.cd_sys.clk,
+            self.rtio_crg.cd_rtio.clk)

    def add_rtio(self, rtio_channels):
        self.submodules.rtio_tsc = rtio.TSC("async", glbl_fine_ts_width=3)