settings: add MT41K128M16 (Arty) and MT41K256M16 (Nexys video)

litedram/settings.py

@@ -194,3 +194,33 @@ class MT41J128M16(SDRAMModule):
     tWTR  = 3
     tREFI = 64*1000*1000/16384
     tRFC  = 260
+
+
+class MT41K128M16(SDRAMModule):
+    memtype = "DDR3"
+    # geometry
+    nbanks = 8
+    nrows  = 16384
+    ncols  = 1024
+    # timings (-7 speedgrade)
+    tRP   = 13.75
+    tRCD  = 13.75
+    tWR   = 15
+    tWTR  = 8
+    tREFI = 64*1000*1000/8192
+    tRFC  = 160
+
+
+class MT41K256M16(SDRAMModule):
+    memtype = "DDR3"
+    # geometry
+    nbanks = 8
+    nrows  = 32768
+    ncols  = 1024
+    # timings (-7 speedgrade)
+    tRP   = 13.75
+    tRCD  = 13.75
+    tWR   = 15
+    tWTR  = 8
+    tREFI = 64*1000*1000/8192
+    tRFC  = 260