This is the baseline HDL files for the single-cycle ARMv4 ARM.

Replace dmem_big.v or dmem_litte.v with dmem.v for correct endianness.
This will depend on how your assembly is compiled (see arm2hex/arm3hex).

The DO file writes memory contents to imemory.dat and demory.dat for
instruction and data memory, respectively.  Check these files to see
if you use a memory instruction to see if its successful.

16 32-bit registers
Data-processing instructions
  ADD, SUB, AND, ORR
Load/Store instructions
  LDR, STR
Branch instruction (PC <= PC + offset, PC holds 8 bytes past Branch Instr)
  B, BL