From 2bbaea3ad563bb2f693b4a14842170fb62d841b2 Mon Sep 17 00:00:00 2001
From: morgan <mc@m-labs.hk>
Date: Fri, 26 Apr 2024 15:01:06 +0800
Subject: [PATCH] SMAFreqMulti: set mmcm bw to HIGH for lower jitter

---
 src/gateware/wrpll.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/gateware/wrpll.py b/src/gateware/wrpll.py
index a6b2b488..aaf604bc 100644
--- a/src/gateware/wrpll.py
+++ b/src/gateware/wrpll.py
@@ -203,7 +203,7 @@ class SMAFrequencyMultiplier(Module, AutoCSR):
             # MMCME2 is capable to accept 10MHz input while PLLE2 only support down to 19MHz input (DS191)
             # The MMCME2 can be reconfiged during runtime using the Dynamic Reconfiguration Ports
             Instance("MMCME2_ADV",
-                p_BANDWIDTH="LOW",  # lower jitter
+                p_BANDWIDTH="HIGH",  # lower output jitter (see https://support.xilinx.com/s/question/0D52E00006iHqRqSAK)
                 o_LOCKED=self.mmcm_locked.status,
                 i_RST=self.mmcm_reset.storage,