Merge pull request #20 from bunnie/400mhz-pr

add 400MHz tap setting (valid for -3 and -2/2E speed grades)
ambrop72 · Aug 9, 2018 · 74c3c09 · 74c3c09
2 parents e02a251 + 4823058
commit 74c3c09
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/litedram/phy/s7ddrphy.py b/litedram/phy/s7ddrphy.py
@@ -76,7 +76,9 @@ def __init__(self, pads, with_odelay, memtype="DDR3", nphases=4, sys_clk_freq=10
         iodelay_tap_average = {
             200e6: 78e-12,
             300e6: 52e-12,
+            400e6: 39e-12, # Only valid for -3 and -2/2E speed grades
         }
+
         half_sys8x_taps = math.floor(tck/(4*iodelay_tap_average[iodelay_clk_freq]))
         self._half_sys8x_taps = CSRStorage(4, reset=half_sys8x_taps)