diff --git a/configs/common/MemConfig.py b/configs/common/MemConfig.py index 4e772c3ea..0f36358cf 100644 --- a/configs/common/MemConfig.py +++ b/configs/common/MemConfig.py @@ -52,6 +52,7 @@ _mem_aliases_all = [ ("simple_mem", "SimpleMemory"), ("ddr3-1600", "SimpleDDR3"), ("lpddr2_s4-1066", "SimpleLPDDR2_S4"), + ("lpddr3-1600", "SimpleLPDDR3"), ("wio-200", "SimpleWideIO"), ] diff --git a/src/mem/SimpleDRAM.py b/src/mem/SimpleDRAM.py index 4ca37a64d..9101de101 100644 --- a/src/mem/SimpleDRAM.py +++ b/src/mem/SimpleDRAM.py @@ -277,3 +277,41 @@ class SimpleWideIO(SimpleDRAM): # Two instead of four activation window tXAW = '50ns' activation_limit = 2 + +# High-level model of a single LPDDR3 x32 interface (one +# command/address bus), with default timings based on a LPDDR3-1600 4 +# Gbit part +class SimpleLPDDR3(SimpleDRAM): + # 4 Gb and 8 Gb devices use a 1 kByte page size, so ssuming 64 byte + # cache lines, that is 16 lines + lines_per_rowbuffer = 16 + + # Use a single rank + ranks_per_channel = 1 + + # LPDDR3 has 8 banks in all configurations + banks_per_rank = 8 + + # Fixed at 15 ns + tRCD = '15ns' + + # 12 CK read latency, 6 CK write latency @ 800 MHz, 1.25 ns cycle time + tCL = '15ns' + + # Pre-charge one bank 15 ns and all banks 18 ns + tRP = '18ns' + + # Assuming 64 byte cache lines, across a x32 DDR interface + # translates to two bursts of BL8, 8 clocks @ 800 MHz + tBURST = '10ns' + + # LPDDR3, 4 Gb + tRFC = '130ns' + tREFI = '3.9us' + + # Irrespective of speed grade, tWTR is 7.5 ns + tWTR = '7.5ns' + + # Irrespective of size, tFAW is 50 ns + tXAW = '50ns' + activation_limit = 4