From 429f533bd0c88d682bd19423ad9071dc03a2728d Mon Sep 17 00:00:00 2001 From: Florent Kermarrec Date: Mon, 18 Apr 2016 18:22:53 +0200 Subject: [PATCH] soc/cores/sdram/settings: simplify modules and fix timing margins computation --- litex/boards/targets/de0nano.py | 4 +- litex/boards/targets/kc705.py | 2 +- litex/boards/targets/minispartan6.py | 2 +- litex/boards/targets/sim.py | 2 +- litex/soc/cores/sdram/settings.py | 284 ++++++++++++--------------- 5 files changed, 130 insertions(+), 164 deletions(-) diff --git a/litex/boards/targets/de0nano.py b/litex/boards/targets/de0nano.py index 790c69fe..c0a4c6dd 100755 --- a/litex/boards/targets/de0nano.py +++ b/litex/boards/targets/de0nano.py @@ -95,8 +95,8 @@ class BaseSoC(SoCSDRAM): self.submodules.crg = _CRG(platform) if not self.integrated_main_ram_size: - self.submodules.sdrphy = GENSDRPHY(platform.request("sdram")) - sdram_module = IS42S16160(self.clk_freq) + self.submodules.sdrphy = GENSDRPHY(platform.request("sdram"),) + sdram_module = IS42S16160(self.clk_freq, "1:1") self.register_sdram(self.sdrphy, "minicon", sdram_module.geom_settings, sdram_module.timing_settings) diff --git a/litex/boards/targets/kc705.py b/litex/boards/targets/kc705.py index b63a9fc8..a77f6f95 100755 --- a/litex/boards/targets/kc705.py +++ b/litex/boards/targets/kc705.py @@ -93,7 +93,7 @@ class BaseSoC(SoCSDRAM): if not self.integrated_main_ram_size: self.submodules.ddrphy = k7ddrphy.K7DDRPHY(platform.request("ddram")) - sdram_module = MT8JTF12864(self.clk_freq) + sdram_module = MT8JTF12864(self.clk_freq, "1:4") self.register_sdram(self.ddrphy, sdram_controller_type, sdram_module.geom_settings, sdram_module.timing_settings) diff --git a/litex/boards/targets/minispartan6.py b/litex/boards/targets/minispartan6.py index 7fead695..19df78ab 100755 --- a/litex/boards/targets/minispartan6.py +++ b/litex/boards/targets/minispartan6.py @@ -76,7 +76,7 @@ class BaseSoC(SoCSDRAM): if not self.integrated_main_ram_size: self.submodules.sdrphy = GENSDRPHY(platform.request("sdram")) - sdram_module = AS4C16M16(clk_freq) + sdram_module = AS4C16M16(clk_freq, "1:1") self.register_sdram(self.sdrphy, "minicon", sdram_module.geom_settings, sdram_module.timing_settings) diff --git a/litex/boards/targets/sim.py b/litex/boards/targets/sim.py index 8c0f17c5..c6d972e2 100755 --- a/litex/boards/targets/sim.py +++ b/litex/boards/targets/sim.py @@ -31,7 +31,7 @@ class BaseSoC(SoCSDRAM): self.submodules.uart = uart.UART(self.uart_phy) if not self.integrated_main_ram_size: - sdram_module = IS42S16160(self.clk_freq) + sdram_module = IS42S16160(self.clk_freq, "1:1") phy_settings = PhySettings( memtype="SDR", dfi_databits=1*16, diff --git a/litex/soc/cores/sdram/settings.py b/litex/soc/cores/sdram/settings.py index 0e99ac12..6f61d1be 100644 --- a/litex/soc/cores/sdram/settings.py +++ b/litex/soc/cores/sdram/settings.py @@ -27,204 +27,170 @@ TimingSettings = namedtuple("TimingSettings", "tRP tRCD tWR tWTR tREFI tRFC") class SDRAMModule: - def __init__(self, clk_freq, memtype, geom_settings, timing_settings): + def __init__(self, clk_freq, rate): self.clk_freq = clk_freq - self.memtype = memtype + self.rate = rate self.geom_settings = GeomSettings( - bankbits=log2_int(geom_settings["nbanks"]), - rowbits=log2_int(geom_settings["nrows"]), - colbits=log2_int(geom_settings["ncols"]), + bankbits=log2_int(self.nbanks), + rowbits=log2_int(self.nrows), + colbits=log2_int(self.ncols), ) self.timing_settings = TimingSettings( - tRP=self.ns(timing_settings["tRP"]), - tRCD=self.ns(timing_settings["tRCD"]), - tWR=self.ns(timing_settings["tWR"]), - tWTR=timing_settings["tWTR"], - tREFI=self.ns(timing_settings["tREFI"], False), - tRFC=self.ns(timing_settings["tRFC"]) + tRP=self.ns(self.tRP), + tRCD=self.ns(self.tRCD), + tWR=self.ns(self.tWR), + tWTR=self.tWTR, + tREFI=self.ns(self.tREFI, False), + tRFC=self.ns(self.tRFC) ) def ns(self, t, margin=True): clk_period_ns = 1000000000/self.clk_freq if margin: - t += clk_period_ns/2 + margins = { + "1:1" : 0, + "1:2" : clk_period_ns/2, + "1:4" : 3*clk_period_ns/4 + } + t += margins[self.rate] return ceil(t/clk_period_ns) # SDR class IS42S16160(SDRAMModule): - geom_settings = { - "nbanks": 4, - "nrows": 8192, - "ncols": 512 - } - # Timings for -7 speedgrade - timing_settings = { - "tRP": 20, - "tRCD": 20, - "tWR": 20, - "tWTR": 2, - "tREFI": 64*1000*1000/8192, - "tRFC": 70 - } - def __init__(self, clk_freq): - SDRAMModule.__init__(self, clk_freq, "SDR", self.geom_settings, - self.timing_settings) + memtype = "SDR" + # geometry + nbanks = 4 + nrows = 8192 + ncols = 512 + # timings (-7 speedgrade) + tRP = 20 + tRCD = 20 + tWR = 20 + tWTR = 2 + tREFI = 64*1000*1000/8192 + tRFC = 70 class MT48LC4M16(SDRAMModule): - geom_settings = { - "nbanks": 4, - "nrows": 4096, - "ncols": 256 - } - timing_settings = { - "tRP": 15, - "tRCD": 15, - "tWR": 14, - "tWTR": 2, - "tREFI": 64*1000*1000/4096, - "tRFC": 66 - } - def __init__(self, clk_freq): - SDRAMModule.__init__(self, clk_freq, "SDR", self.geom_settings, - self.timing_settings) + memtype = "SDR" + # geometry + nbanks = 4 + nrows = 4096 + ncols = 256 + # timings (-7 speedgrade) + tRP = 15 + tRCD = 15 + tWR = 14 + tWTR = 2 + tREFI = 64*1000*1000/4096 + tRFC = 66 class AS4C16M16(SDRAMModule): - geom_settings = { - "nbanks": 4, - "nrows": 8192, - "ncols": 512 - } - # Timings for -6 speedgrade - timing_settings = { - "tRP": 18, - "tRCD": 18, - "tWR": 12, - "tWTR": 2, - "tREFI": 64*1000*1000/8192, - "tRFC": 60 - } - def __init__(self, clk_freq): - SDRAMModule.__init__(self, clk_freq, "SDR", self.geom_settings, - self.timing_settings) + memtype = "SDR" + # geometry + nbanks = 4 + nrows = 8192 + ncols = 512 + # timings (-6 speedgrade) + tRP = 18 + tRCD = 18 + tWR = 12 + tWTR = 2 + tREFI = 64*1000*1000/8192 + tRFC = 60 # DDR class MT46V32M16(SDRAMModule): - geom_settings = { - "nbanks": 4, - "nrows": 8192, - "ncols": 1024 - } - timing_settings = { - "tRP": 15, - "tRCD": 15, - "tWR": 15, - "tWTR": 2, - "tREFI": 64*1000*1000/8192, - "tRFC": 70 - } - def __init__(self, clk_freq): - SDRAMModule.__init__(self, clk_freq, "DDR", self.geom_settings, - self.timing_settings) + memtype = "DDR" + # geometry + nbanks = 4 + nrows = 8192 + ncols = 1024 + # timings (-6 speedgrade) + tRP = 15 + tRCD = 15 + tWR = 15 + tWTR = 2 + tREFI = 64*1000*1000/8192 + tRFC = 70 # LPDDR class MT46H32M16(SDRAMModule): - geom_settings = { - "nbanks": 4, - "nrows": 8192, - "ncols": 1024 - } - timing_settings = { - "tRP": 15, - "tRCD": 15, - "tWR": 15, - "tWTR": 2, - "tREFI": 64*1000*1000/8192, - "tRFC": 72 - } - def __init__(self, clk_freq): - SDRAMModule.__init__(self, clk_freq, "LPDDR", self.geom_settings, - self.timing_settings) + memtype = "LPDDR" + # geometry + nbanks = 4 + nrows = 8192 + ncols = 1024 + # timings + tRP = 15 + tRCD = 15 + tWR = 15 + tWTR = 2 + tREFI = 64*1000*1000/8192 + tRFC = 72 # DDR2 class MT47H128M8(SDRAMModule): - geom_settings = { - "nbanks": 8, - "nrows": 16384, - "ncols": 1024 - } - timing_settings = { - "tRP": 15, - "tRCD": 15, - "tWR": 15, - "tWTR": 2, - "tREFI": 7800, - "tRFC": 127.5 - } - def __init__(self, clk_freq): - SDRAMModule.__init__(self, clk_freq, "DDR2", self.geom_settings, - self.timing_settings) + memtype = "DDR2" + # geometry + nbanks = 8 + nrows = 16384 + ncols = 1024 + # timings + tRP = 15 + tRCD = 15 + tWR = 15 + tWTR = 2 + tREFI = 7800 + tRFC = 127.5 class P3R1GE4JGF(SDRAMModule): - geom_settings = { - "nbanks": 8, - "nrows": 8192, - "ncols": 1024 - } - timing_settings = { - "tRP": 12.5, - "tRCD": 12.5, - "tWR": 15, - "tWTR": 3, - "tREFI": 7800, - "tRFC": 127.5, - } - - def __init__(self, clk_freq): - SDRAMModule.__init__(self, clk_freq, "DDR2", self.geom_settings, - self.timing_settings) + memtype = "DDR2" + # geometry + nbanks = 8 + nrows = 8192 + ncols = 1024 + # timings + tRP = 12.5 + tRCD = 12.5 + tWR = 15 + tWTR = 3 + tREFI = 7800 + tRFC = 127.5 # DDR3 class MT8JTF12864(SDRAMModule): - geom_settings = { - "nbanks": 8, - "nrows": 16384, - "ncols": 1024 - } - timing_settings = { - "tRP": 15, - "tRCD": 15, - "tWR": 15, - "tWTR": 2, - "tREFI": 7800, - "tRFC": 70 - } - def __init__(self, clk_freq): - SDRAMModule.__init__(self, clk_freq, "DDR3", self.geom_settings, - self.timing_settings) + memtype = "DDR3" + # geometry + nbanks = 8 + nrows = 16384 + ncols = 1024 + # timings + tRP = 15 + tRCD = 15 + tWR = 15 + tWTR = 2 + tREFI = 7800 + tRFC = 70 class MT41J128M16(SDRAMModule): - geom_settings = { - "nbanks": 8, - "nrows": 16384, - "ncols": 1024, - } - timing_settings = { - "tRP": 15, - "tRCD": 15, - "tWR": 15, - "tWTR": 3, - "tREFI": 64*1000*1000/16384, - "tRFC": 260, - } - def __init__(self, clk_freq): - SDRAMModule.__init__(self, clk_freq, "DDR3", self.geom_settings, - self.timing_settings) + memtype = "DDR3" + # geometry + nbanks = 8 + nrows = 16384 + ncols = 1024 + # timings + tRP = 15 + tRCD = 15 + tWR = 15 + tWTR = 3 + tREFI = 64*1000*1000/16384 + tRFC = 260 -- 2.30.2