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