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

add 400MHz tap setting (valid for -3 and -2/2E speed grades)
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enjoy-digital 2018-08-09 08:20:29 +02:00 committed by GitHub
parent e02a251cde 48230583b9
commit 74c3c092ea
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litedram/phy/s7ddrphy.py
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@ -76,7 +76,9 @@ class S7DDRPHY(Module, AutoCSR):
iodelay_tap_average = { iodelay_tap_average = {
200e6: 78e-12, 200e6: 78e-12,
300e6: 52e-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])) half_sys8x_taps = math.floor(tck/(4*iodelay_tap_average[iodelay_clk_freq]))
self._half_sys8x_taps = CSRStorage(4, reset=half_sys8x_taps) self._half_sys8x_taps = CSRStorage(4, reset=half_sys8x_taps)