ARM11.ppt
- 1. ARM 11 Igor Kamzic Brock University
- 2. HISTORY Previously known as Advanced RISC Machine ARM architecture is 32 – bit RISC processor architecture Developed by ARM Limited Widely used in embedded systems ARM 11 family compromises four series of processors that implement the ARM architecture v6
- 3. HISTORY ARM 11 is the first implementation of the ARMv6 instruction set architecture It is the base for all family of ARM 11 cores The key objective in developing ARM 11 microarchitecture was to deliver high performance and low power consumption together with low price ARM 11 has impact on wide variety of applications in wireless, consumer, networking and automotive segments
- 4. PERFORMANCE Superior performance of ARM 11 cores is possible because of ARMv6 architecture ARMv6 delivers superior performance trough: 1. Media processing extensions 2. Improved cache architecture 3. Improved exception and interrupt handling 4. Unaligned and mixed – endian data support
- 5. FEATURES ARM 11 is Reduced Instruction Set Computer (RISC) and it incorporates following features: 1. Large uniform register file 2. Load/store architecture where data – processing operations only operate on register contents and not directly on memory 3. Simple addressing modes with all load/store addresses being determined from register contents and instruction fields only
- 6. FEATURES In addition ARM 11 architecture provides : 1. Control over ALU and the shifter in most data processing instructions 2. Auto increment and auto decrement addressing modes to optimize program loops 3. Load and store multiple instructions to maximize data throughput 4. Conditional execution on almost all instructions to maximize execution throughput
- 7. REGISTERS ARM 11 has 31 general purpose 32-bit registers and 6 status registers At any of times only 16 of these registers are visible and the others are used to speed up exception processing. 3 of those 16 visible registers have special roles (stack pointer, link register and program counter).
- 8. EXCEPTIONS ARM 11 supports 7 types of exceptions: 1. Reset 2. Attempted execution of undefined instruction 3. Software interrupts instruction 4. Prefetch abort 5. Data abort 6. IRQ normal interrupt 7. FIQ fast interrupt
- 9. INSTRUCTION SET ARM 11 instruction set can be divided in 6 classes of instructions: 1. Branch instructions 2. Data processing instructions 3. Status register transfer instructions 4. Load and store instructions 5. Coprocessors instructions 6. Exception generating instructions
- 10. ADDRESS SPACE ARM 11 architecture uses a single flat address space of 2³² bytes. Byte addresses are treated as unsigned numbers running from 0 to 2³² -1. This address space is regarded as consisting of 32-bits words each of whose address is word aligned.
- 11. PIPELINE To deliver enhanced performance keyword in this architecture is pipeline Pipeline in ARM 11 differs from all the previous families of ARM cores in number of stages it implements (8 stages) It enable 40 % better output then all previous cores ARM 11 avoids delays in pipeline by using forwarding and branch prediction
- 12. PIPELINE These techniques provide great efficiency by reducing pipeline stalls ARM 11 microarchitecture pipeline is scalar (issues one instruction at the time) Improved memory access gives better overall performance significantly in ARM 11 Instructions and data remain in caches longer which in turn reduces cache misses One of the major improvements in ARM 11 cores is non – blocking operation of memory
- 13. ARM 11 PIPELINE STRUCTURE
- 14. PARALLELISM Even with pipeline that has single issue instruction ARM 11 still manages to provide parallelism Parallelism is implemented at the back end of pipeline where we have separate units for ALU and separate units for LS (load and store) To maximize parallel pipeline ARM 11 enables out – of – order completion (instructions don’t have dependencies on outcome of previous instruction)
- 15. 64 - BIT In some applications there is need for 64 – bit processor ARM 11 delivers 64 – bit structure without actually implementing the 64 – bit solution 64 – bit data buses between processor integer unit and instruction and data caches and also between coprocessors and integer unit (64 – bit path allows two instructions to be fetched from cache in one cycle) This gives great performance
- 16. SUPPORT FEATURES ARM 11 supports floating point as design option (cores with and cores without floating point processing units) ARM 11 supports : 1. Java Decode 2. V6 SIMD Instructions 3. MIA Instructions (as coprocessors) 4. Performance Range (350 MHz - > 1GHz)
- 17. APPLICATIONS ARM 11 family of processors is widely used in many areas Some of the examples: 1. iPhone 2. iPod Touch 3. NVIDIA GoForce 6100 4. Nokia E71 smartphone 5. And many more…
- 18. REFERENCES The ARM 11 Microarchitecture David Cormie April 2002 www.cs.uiuc.edu/class/fa05/cs433ug/PROCE SSORS/ARM%2011%20MicroArchitecture .pdf www.arm.com (ARM 11 documentation) www.wikipedia.org