ARM7

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ARM7 is a generation of ARM processor designs. This generation introduced the Thumb 16-bit instruction set which provides improved code density compared to previous designs. The most widely used ARM7 designs implement the ARMv4T architecture, but some implement ARMv3 or ARMv5TEJ. All these designs use a Von Neumann architecture, so the few versions which include a cache do not separate data and instruction caches.

Some ARM7 cores are obsolete. One historically significant model, the ARM7DI^[1] is notable as having introduced JTAG based on-chip debugging; the preceding ARM6 cores did not support it. The "D" represented a JTAG TAP for debugging; the "I" denoted an ICEBreaker debug module supporting hardware breakpoints and watchpoints, and letting the system be stalled for debugging. Subsequent cores included and enhanced this support.

Contents 1 ARM7TDMI 1.1 Specifications 1.2 Applications 2 See also 3 External links 4 References

[edit] ARM7TDMI

The ARM7TDMI processor is a 32-bit RISC CPU designed by ARM, and licensed for manufacture by an array of semiconductor companies. In 2009 it remains one of the most widely used ARM cores, and is found in numerous deeply embedded system designs. Differences from the ARM7DI include Thumb support (the "T") and an improved multiplier (the "M").

[edit] Specifications

It is a versatile processor designed for mobile devices and other low power electronics. This processor architecture is capable of up to 130 MIPS on a typical 0.13µm process. The ARM7TDMI processor core implements ARM Architecture v4T. The processor supports both 32-bit and 16-bit instructions via the ARM and Thumb instruction sets.

ARM licenses the processor to various semiconductor companies, which designs full chips using the processor design.

[edit] Applications

Perhaps the most common pieces of electronic equipment currently using this processor are:

• Audio processing in the SEGA Dreamcast
• D-Link DSL-604+ Wireless ADSL Router^[2]
• iPod from Apple
• iriver portable digital audio players (the H10 uses a chip with this processor)
• Juice Box
• Lego Mindstorms NXT
• Most of Nokia's mobile phone range.
• Nintendo DS and Game Boy Advance from Nintendo
• PocketStation
• Roomba 500 series from iRobot
• Sirius Satellite Radio receivers
• The main CPU in Stern Pinball S.A.M System games.
• Many automobiles embed ARM7 cores.

[edit] See also

• ARM9

[edit] External links

• ARM Website
• ARM microcontroller Wiki
• ARM7TDMI Microcontroller Development Resources - header files, schematics, CAD files, etc..
• Source and binaries for running uClinux on the ARM7TDMI
• ARM Microcontroller Development HOWTO - Document describing development environment for ARM7 Microcontrollers on Linux.

[edit] References

1. ^ "ARM7DI Data Sheet"; Document Number ARM DDI 0027D; Issued: Dec 1994.
2. ^ "D-Link DSL-604+ Wireless ADSL Router - Supportforum - eXpansys Sverige". https://www.expansys.se/ft.aspx?k=21814.  090506 expansys.se

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