Learn what arm is in one article

ARM is the abbreviation of Advanced RISC Machines. You can understand that this is the name of a company. It is also correct to think of it as a general term for a type of microprocessor. Not only that, it even represents a technology.

ARM is a company that neither produces chips (fabless) nor sells chips (chipless). It has established a new business model of microprocessor design, production and sales by selling chip technology licenses. More importantly, this business model has been extremely successful. Microprocessors using ARM technology IP cores are used in various electronic products: automobiles, consumer electronics, imaging, industrial control, mass storage, networking, security and wireless markets. ARM technology is almost everywhere.

Many core-based system chip designs are based on ARM cores. Although Intel's microprocessors are overwhelmingly dominant in the PC field, in the embedded system field, Intel has used the ARM core technology license, for example, to launch ARM-based MP3 players. Intel and TI simultaneously obtained the license for the ARM V6 architecture on July 30, 2001.

Many semiconductor companies hold ARM licenses: Atmel, Broadcom, Cirrus Logic, Freescale (spun off from Motorola in 2004), Qualcomm, Fujitsu, Intel (through a settlement with Digital), IBM, Infineon Technologies, Nintendo, NXP Semiconductors (spun off from Philips in 2006), OKI Electric Industries, Samsung Electronics, Sharp, STMicroelectronics, Texas Instruments and VLSI. Many of these companies hold ARM licenses in various forms. Using this partnership, ARM quickly became the creator of many global RISC standards.

Although ARM's licensing program is covered by a confidentiality agreement, ARM is widely known as one of the most expensive CPU cores in the intellectual property industry. A single customer product containing a basic ARM core may require a one-time licensing fee of up to US$200,000. If a large number of architectural modifications are involved, the fee may exceed tens of millions of dollars. Each manufacturer gets a unique set of ARM-related technologies and services.

ARM (Asynchronous Resbonse Mode) is also an unbalanced data link operation mode. Unlike NRM, the transmission process under ARM is initiated by the slave. The frame or frames actively sent by the slave to the master may contain information or may be frames sent only for control purposes. In this operation mode, the slave controls timeout and retransmission. This mode is essential for multi-station links using polling.