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add 400MHz tap setting (valid for -3 and -2/2E speed grades)

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This commit is contained in:
bunnie 2018-08-09 03:04:34 +08:00
parent f0f067fe7d
commit d986b60e03
1 changed files with 2 additions and 0 deletions
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2
litedram/phy/s7ddrphy.py
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@ -76,7 +76,9 @@ class S7DDRPHY(Module, AutoCSR):
iodelay_tap_average = {
200e6: 78e-12,
300e6: 52e-12,
400e6: 39e-12,
}
half_sys8x_taps = math.floor(tck/(4*iodelay_tap_average[iodelay_clk_freq]))
self._half_sys8x_taps = CSRStorage(4, reset=half_sys8x_taps)