examples: add nexys4ddr_config

examples/nexys4ddr_config.py

@@ -0,0 +1,30 @@
+from litedram.modules import MT47H64M16
+from litedram.phy import A7DDRPHY
+
+core_config = {
+    # General ------------------------------------------------------------------
+    "cpu":        "vexriscv",  # Type of CPU used for init/calib (vexriscv, lm32)
+    "speedgrade": -1,          # FPGA speedgrade
+    "memtype":    "DDR2",      # DRAM type
+
+    # PHY ----------------------------------------------------------------------
+    "cmd_delay":       0,           # Command additional delay (in taps)
+    "cmd_latency":     0,           # Command additional latency
+    "sdram_module":    MT47H64M16, # SDRAM modules of the board or SO-DIMM
+    "sdram_module_nb": 2,           # Number of byte groups
+    "sdram_rank_nb":   1,           # Number of ranks
+    "sdram_phy":       A7DDRPHY,    # Type of FPGA PHY
+
+    # Frequency ----------------------------------------------------------------
+    "input_clk_freq":   100e6, # Input clock frequency
+    "sys_clk_freq":     100e6, # System clock frequency (DDR_clk = 4 x sys_clk)
+    "iodelay_clk_freq": 200e6, # IODELAYs reference clock frequency
+
+    # Core ---------------------------------------------------------------------
+    "cmd_buffer_depth": 16,    # Depth of the command buffer
+
+    # User Ports ---------------------------------------------------------------
+    "user_ports_nb":       2,     # Number of user ports
+    "user_ports_type":     "axi", # Type of ports (axi, native)
+    "user_ports_id_width": 32,    # AXI identifier width
+}