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Encyclopedia > StrongARM
DEC StrongARM SA-110 Microprocessor
DEC StrongARM SA-110 Microprocessor

The StrongARM microprocessor is a faster version of the Advanced RISC Machines ARM design. It was created by Digital Equipment Corporation, but later sold to Intel who continued to manufacture it, before replacing it with the XScale. Image File history File links Description: DEC StrongARM Microprocessor Source: http://www. ... Image File history File links Description: DEC StrongARM Microprocessor Source: http://www. ... A microprocessor (sometimes abbreviated µP) is a programmable digital electronic component that incorporates the functions of a central processing unit (CPU) on a single semiconducting integrated circuit (IC). ... The entrance to ARMs headquarters in Cherry Hinton, Cambridge ARM (Advanced RISC Machines) Ltd is a microprocessor design company headquartered in England, founded in 1990 by Hermann Hauser. ... The ARM architecture (previously, the Advanced RISC Machine, and prior to that Acorn RISC Machine) is a 32-bit RISC processor architecture that is widely used in a number of embedded designs. ... The DEC logo Digital Equipment Corporation was a pioneering American company in the computer industry. ... Intel Corporation (NASDAQ: INTC, SEHK: 4335), founded in 1968 as Integrated Electronics Corporation, is an American multinational corporation that is best known for designing and manufacturing microprocessors and specialized integrated circuits. ... XScale is Intels name for their line of StrongARM-based RISC microprocessors and microcontrollers, which they aquired from DECs Digital Semiconductor division as the side-effect of a lawsuit between the two companies. ...


History

The StrongARM was a collaborative project between DEC and ARM to create a faster CPU based on (but not totally compatible with) the existing ARM line. The StrongARM was designed to address the upper-end of the low-power embedded market, where users needed more performance than the ARM could deliver while being able to accept more external support. Targets were devices such as newer personal digital assistants and set-top boxes. palmOne Tungsten T5 (CDAs) are handheld devices that were originally designed as personal organizers, but became much more versatile over the years. ... The term set-top box (STB) describes a device that connects to a television and some external source of signal, and turns the signal into content then displayed on the screen. ...


The project was set up in 1995, and quickly delivered their first design, the SA-100. This was immediately incorporated into newer versions of the Apple Newton, the Acorn Risc PC, Eidos Optima video editing system, as well as a number of other products. The Apple Newton MessagePad The Apple Newton, or simply Newton, is an early line of personal digital assistants developed, manufactured and marketed by Apple Computer from 1993 to 1998. ... The Risc PC (codenamed Medusa) was Acorn Computers Ltds next generation RISC OS/Acorn RISC Machine computer, launched in 1994, which superseded the Acorn Archimedes. ... Eidos Interactive is a publisher of video and computer games based in the United Kingdom. ...


Digital Semiconductor, DEC's chip division, was later sold to Intel as part of a lawsuit settlement. Intel used the StrongARM to replace their ailing line of RISC processors, the i860 and i960. Today the design has been replaced by the Intel XScale. The Intel i860 (also 80860, and code named N10) was a RISC microprocessor from Intel, first released in 1989. ... Intels i960 (or 80960) was a RISC-based microprocessor design that became popular during the early 1990s as an embedded microcontroller, becoming a best-selling CPU in that field, along with the competing AMD 29000. ... Intel Corporation (NASDAQ: INTC, SEHK: 4335), founded in 1968 as Integrated Electronics Corporation, is an American multinational corporation that is best known for designing and manufacturing microprocessors and specialized integrated circuits. ... XScale is Intels name for their line of StrongARM-based RISC microprocessors and microcontrollers, which they aquired from DECs Digital Semiconductor division as the side-effect of a lawsuit between the two companies. ...


Description

The StrongARM family are faster versions of the existing ARM processors with a somewhat different instruction set. Clocked at 206MHz they can perform up to 235 MIPS (1.14 MIPS/MHz). They have limited software compatibility with the earlier ARM families due to their separate caches for data and instructions, which causes self-modifying code to fail. These features were later included in some ARMv4 architectures (notably, the ARM/Texas Instruments ARM925). The StrongARM has an "invalidate cache line" instruction to let the CPU know to reload from main memory. This situation arises rarely in typical software however, and StrongARM is certainly not the only processor to have made such a sacrifice. The Motorola 68020, for instance, caused similar compatibility problems for any software designed for the earlier 68000 and 68010 models. An instruction set, or instruction set architecture (ISA), describes the aspects of a computer architecture visible to a programmer, including the native datatypes, instructions, registers, addressing modes, memory architecture, interrupt and exception handling, and external I/O (if any). ... Million instructions per second (MIPS) is a measure of a computers processor speed. ... In computer science, self-modifying code is code that modifies itself on purpose. ... Motorola (NYSE: MOT) is an American international communications company based in Schaumburg, Illinois, a Chicago suburb. ... Motorola 68020 The Motorola 68020 is a microprocessor from Motorola. ... The Motorola 68000 is a 32-bit CISC microprocessor from Motorola. ... The Motorola MC68010 processor is a 16/32-bit microprocessor from Motorola, released in 1982 [1]. It is largely similar to the Motorola 68000 CPU with the exception of the addition of several instructions for breakpoint and register control (ccr instead of sr), as well as the ability to save...


The StrongARM is designed with slow (and therefore cheap and low cost) memory in mind. The StrongARM has a 32 way set associative cache which works on virtual addresses. The high set associativity allows a higher hit rate than competing designs, and the use of virtual addresses allows memory to be simultaneously cached and uncached. A write buffer allows writes to main memory to happen without the CPU stalling, increasing the efficiency of the design.


The SA-100 was the first member of the family, updated as the SA-110 and then SA-1110.


  Results from FactBites:
 
PDA Encyclopedia - StrongARM (283 words)
The StrongARM was a collaborative project between DEC and ARM to create a faster CPU based on (but not totally compatible with) the existing ARM line.
The StrongARM was designed to address the upper-end of the low-power embedded market, where users needed more performance than the ARM could deliver while being able to accept more external support.
The StrongARM family are faster versions of the existing ARM processors with a somewhat different instruction set.
  More results at FactBites »

 
 

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