Overview of the MIPS architecture What is a computer architecture? Fetch-decode-execute cycle Datapath and control unit

State Element: Register File Microarchitecture toimplement architectural state Built using D flip-flops MIPS: Need to be able to read two operands at once 2 source operands per instruction 5 R e a d re gi st e r 1

— MIPS is a 32-bit machine, so most of the buses are 32-bits wide. The control unit tells the datapath what to do, based on the instruction that’s currently being executed. — Our processor has ten control signals that regulate the datapath.

You are familiar with how MIPS programs step from one instruction to the next, and how branches can occur conditionally or unconditionally. We next examine the machine level repre-sentation of how MIPS goes from one instruction to the next.

Data paths for MIPSinstructions You are familiar with how MIPS programs step from one instruction to the next, and how branches can occur c. nditionally or unconditionally. We next examine the machine level repre-sentation of how MIPS goes f.

Analyze instruction set => datapath requirements. 2. Select the set of datapath components and establish clocking methodology. 3. Assemble the datapath meeting the requirements. 4. Analyze the implementation of each instruction to determine the settings of the control points that effects the register transfer. 5. Assemble the control logic.

Verilog code for a 32-bit pipelined MIPS processor. Datapath diagram with control signals is included in PDF format. Combination of gate-level, dataflow and behavioural modelling.

This paper presents the design and implementation of a 32-bit MIPS (Microprocessor without Interlocked Pipeline Stage) processor based on QRD using Givens Rotation algorithm.

MIPS Architecture Example: subset of MIPS processor architecture Drawn from Patterson & Hennessy MIPS is a 32-bit architecture with 32 registers Consider 8-bit subset using 8-bit datapath Only implement 8 registers ($0 - $7) $0 hardwired to 00000000

How do we know at what address to fetch instruction? What do we end up with? What happens to the PC each instruction? How many registers do we need to read? tells us the register number? write? What happens if instruction reads and writes same register? operations may loop twice through machine, getting incorrect result.