Morgan Kaufmann, 2010.GCC can produce assembly code for a large number of architectures, include MIPS. Digital design and computer architecture. MIPS-CPU that support exception handling. It is preloaded in the second ROM in all versions of Upon exception, PC will be set toĠx00000800 to run the service program. Which is the special address reserved for the service program. This program has to be loaded into the second ROM in MIPS-CPU, It supports multi-level interruption by saving everything to a stack in (including saving PC value to EPC), executing an example service program, and then restore theĮnvironments at the end. Programs/exception_service.asm along with assembled hex file. ('iced cafe') to indicate success, if anything went wrong, 0xBAADC0DE ('baad code') will beįor special service programs, an exception service program is provided at Patterns and numbers (as showcased in the gif) and at the end show a magic number 0x1CEDCAFE When executed, the 7-seg LED screen will show various Preloaded in ROM in all versions of MIPS-CPU. Programs/benchmark.asm along with assembled hex file ending with. Example Programsįor normal programs, a benchmark file containing various tests is located at This design makes it really easy to load normal and special service programs in MIPS-CPU. The purpose for loading / storing special service programs and cannot be mixed with normal The second ROM (with a start address 0x00000800) then serves Two ROMs with 9-bit address widths, where the most significant bit of the address will be used Therefore, 10-bit address space ROM is implemented via Programs, require a pre-determined fixed address and PC will be set to this address to call Some special programs, e.g., exception service MIPS-CPU uses 10-bit address space for ROMs. The hex file can then be loaded into the ROM part of MIPS-CPU for it to execute.Open the hex file and add a v2.0 raw line at the beginning.File -> Dump Memory and choose Hexadecimal Text as Dump Format.Run -> Assemble to assembly the assembly code.Settings -> Memory Configuration, change configuration to Compact, Data Address at 0.The following steps can be used to obtain an assembled file to be loaded in MIPS-CPU: Instruction by instruction and compare registers, memories, etc. Bugs can be easily identified by running Mars to execute the programs Mars since it is a powerful MIPS assemblerĪnd debugger. There are many existing MIPS assemblers you can use, we used Refer to Quick Reference and Complete Instruction Manual from Program which displays 2 or 4 or 8 determined by the source number of the clicked button. The CPU runs into exception mode on clicking one of the buttons, running an exception service ![]() (only) handles exception (interruption), with 3 interruption source buttons named ExpSrc. ![]() Featuresġ0-bit Address Space for ROM (Code) and RAM (Memory).Įxception Handling: MIPS-CPU (and single cycle CPU) is equipped with a co-processor CP0 which Referred to as MIPS-CPU in the rest of this README. The main and most feature-rich version is the pipelined CPU with operand forwarding, which will be The same folder as the CPU circ file for it to work. Note that the common components in src/common are shared among the CPUs, and must be present in Is used for data hazards to reduce the total number of pipeline stalls for better performance. ( pipeline_cpu_bubbling.circ)īased on Pipeline bubbling, Operand Forwarding There are two versions for solving theįor all hazards. Pipelined CPU: A five-stage pipelined CPU. Single Cycle CPU: Each instruction takes exactly one CPU cycle to finish. Two categories of CPU, totaling three implementations, exist in this repository: For more details about implementations please refer to the wiki page. Basic understanding of digital design and MIPS pipelined CPU is strongly recommended ( is a great textbook for learning). A Simulative 32-bit CPU Running on MIPS Instruction System Based on Logisim (Newer version Logisim Evolution is not supported).
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