arm

사실 아주 기본적인것이지만, 사실 잘 모르는 것들..ㅠㅠ

ARM architecture 

armv7, armv8..

ARM developed architecture extensions to provide support for Java acceleration (Jazelle®), security (TrustZone®), SIMD, and Advanced SIMD (NEON™) technologies. The ARMv8-architecture adds a Cryptographic extension as an optional feature.

The ARM architecture is similar to a Reduced Instruction Set Computer (RISC) architecture, as it incorporates these typical RISC architecture features:

A uniform register file load/store architecture, where data processing operates only on register contents, not directly on memory contents.

Simple addressing modes, with all load/store addresses determined from register contents and instruction fields only.

출처 : http://www.arm.com/products/processors/instruction-set-architectures/index.php

ARM core

cortex 시리즈.

Architecture Specs Comparison
	ARM11	ARM Cortex A5	ARM Cortex A8
Cores	1	1/2/4	1
Pipeline Depth	8 stages	8 stages	9 stages
DMIPS/MHz per core	1.25	1.57	2.0
FPU	Optional VFPv2(not-pipelined)	VFPv4	VFPv3(not-pipelined)
NEON	NO	YES(128-bit wide)	YES(64-bit wide)
Process Technology(Lithography)	90nm	40nm	65nm/45nm
Typical Clock Speeds	412MHz	600MHz/1GHz	600MHz/1GHz

 

cortex-A8은 architecture v7-A with a 13-stage pipeline이고,

cortex - A15는

reference : http://www.theregister.co.uk/2011/10/20/details_on_big_little_processing/

ARM processor 

일반적으로 알고 있는 SoC에 해당할듯.

serial interface, PLL, External interface, interrupt controller, JTAG..등으로 구성되어 있다.

각 block들을 IP(Intellectual property)라고 호칭하며, Arm의 경우 IP간 bus통신 protocol은 AMBA이다.

samsung : exynos

Exynos5250 : cortex-A15 Dual-core : arm v7

nVIDIA : Tegra

tegra K1

cpu : NVIDIA 4-Plus-1™ Quad-Core ARM Cortex-A15 "r3" : armv7

gpu : 192 NVIDIA CUDA® Cores

reference : http://www.nvidia.com/object/tegra-k1-processor.html

Broadcom :

BCM2835 :  ARM1176JZ-F single-core : arm v6