ARM7

Instruction set	ARM architecture

ARM7 is a generation of ARM processor designs. This generation introduced the Thumb 16-bit instruction set providing 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, thus the few versions comprising a cache do not separate data and instruction caches.

Some ARM7 cores are obsolete. One historically significant model, the ARM7DI^[1] is notable for 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.

ARM7-TDMI [link]

The ARM7-TDMI (ARM7-Thumb+Debug+Multiplier+ICE) 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. Texas Instruments licensed the ARM7-TDMI, which was designed into the Nokia 6110.^[2] The ARM7TDMI-S variant is the synthesizable core.

Specifications [link]

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 0.13 µm 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 design full chips based on the ARM processor architecture.

Applications [link]

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

• Audio controller in the SEGA Dreamcast
• D-Link DSL-604+ Wireless ADSL Router^[3]
• 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 (co-processor) 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.
• In Building Automation, the American Auto-Matrix BBC-SD (BACnet Touchscreen Display) uses an ARM7 TDMI core
• In tournament waterski and wakeboard towboats, Perfect Pass speed control
• Many automobiles embed ARM7 cores.
• Samsung MicroSD cards contain an ARM7TDMI controller with 128k of code.^[4]

See also [link]

Electronics portal

• ARM architecture, List of ARM microprocessor cores
• JTAG

External links [link]

• ARM Website
• 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.

References [link]

1. ^ "ARM7DI Data Sheet"; Document Number ARM DDI 0027D; Issued: Dec 1994.
2. ^ Sakr, Sharif. "ARM co-founder John Biggs". Engadget. https://www.engadget.com/2011/12/20/the-engadget-interview-arm-co-founder-john-biggs/. Retrieved December 23, 2011. "[...] the ARM7-TDMI was licensed by Texas Instruments and designed into the Nokia 6110, which was the first ARM-powered GSM phone." 
3. ^ "D-Link DSL-604+ Wireless ADSL Router - Supportforum - eXpansys Sverige". https://www.expansys.se/ft.aspx?k=21814.  090506 expansys.se
4. ^ Andrew (bunnie) Huang. "On MicroSD Problems". Bunnie Studios. https://www.bunniestudios.com/blog/?page_id=1022. "This is comparable to the raw die cost of the controller IC, according to my models; and by making the controllers very smart (the Samsung controller is a 32-bit ARM7TDMI with 128k of code), you get to omit this expensive test step while delivering extra value to customers" 

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