diff --git a/litex_boards/targets/terasic_sockit.py b/litex_boards/targets/terasic_sockit.py index 028b710..c648198 100755 --- a/litex_boards/targets/terasic_sockit.py +++ b/litex_boards/targets/terasic_sockit.py @@ -19,51 +19,9 @@ from litex.soc.cores.video import VideoVGAPHY from litex.build.io import DDROutput -from litedram.modules import AS4C32M16 +from litedram.modules import W9825G6KH6, AS4C32M16 from litedram.phy import HalfRateGENSDRPHY, GENSDRPHY -# DRAM Module for XS board v2.2 ---------------------------------------------------------------------- -# FIXME: Move to litedram.modules. - -from litedram.modules import _TechnologyTimings, _SpeedgradeTimings, SDRModule - -class W9825G6KH6(SDRModule): - """ - Winbond W9825G6KH-6 chip on Mister SDRAM XS board v2.2 - This is the smallest and cheapest module. - running it at 100MHz (1:2 if system clock is 50MHz) - works well on my SoCKit and all 32MB test error free - I get a number of data errors if I run it at 50MHz, - so this defaults to 1:2. If you want to use a higher - system clock (eg 100MHz), you might want to consider - using 1:1 clocking, because the -6 speedgrade - can be clocked up to 166MHz (CL3) or 133MHz (CL2) - """ - # geometry - nbanks = 4 - nrows = 8192 - ncols = 512 - - @staticmethod - def clock_cycles_to_ns(cycles, clk_freq, sdram_rate) -> float: - d = { - "1:1" : 1, - "1:2" : 2, - "1:4" : 4 - } - return cycles / (d[sdram_rate] * clk_freq) / 1e-9 - - def __init__(self, clk_freq, sdram_rate): - # The datasheet specifies tWr in clock cycles, not in - # ns but to me it looks like litedram expects - # ns for these two parameters, so I have to convert them - # to ns first. - tWr = self.clock_cycles_to_ns(2, clk_freq, sdram_rate) - tRRD = self.clock_cycles_to_ns(2, clk_freq, sdram_rate) - self.technology_timings = _TechnologyTimings(tREFI=64e6/8000, tWTR=(2, None), tCCD=(1, None), tRRD=(None, tRRD)) - self.speedgrade_timings = {"default": _SpeedgradeTimings(tRP=15, tRCD=15, tWR=tWr, tRFC=(None, 60), tFAW=None, tRAS=42)} - super().__init__(clk_freq, sdram_rate) - # CRG ---------------------------------------------------------------------------------------------- class _CRG(Module):