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StrongARM

The StrongARM is a family of 32-bit reduced instruction set computing (RISC) microprocessors based on the ARMv4 architecture, developed jointly by Digital Equipment Corporation (DEC) and ARM Holdings in the mid-1990s as a high-performance, low-power solution for embedded and portable applications.^[1] Introduced on September 12, 1996, with the initial SA-110 model, it featured a custom microarchitecture that significantly outperformed earlier ARM designs while maintaining compatibility with the ARM instruction set.^[2] Key architectural elements of the StrongARM include a five-stage in-order pipeline, 16 KiB of 32-way set-associative L1 instruction and data caches, a memory management unit (MMU), and a write buffer, all fabricated on a 0.35 µm process with approximately 2.1 million transistors.^[1] The SA-110 operated at clock speeds of 166 MHz or 233 MHz, delivering up to 270 Dhrystone 2.1 MIPS while consuming under 1 watt of power, enabling efficient operation in battery-constrained environments.^[2] Subsequent variants, such as the SA-1100, added enhancements like dynamic voltage scaling and integrated peripherals for improved integration.^[3] Widely adopted in the late 1990s and early 2000s, the StrongARM powered personal digital assistants (PDAs), handheld computers, and embedded systems, including the Apple MessagePad 2000 and 2100, HP Jornada series, Psion Series 7, and Yakumo Alpha PDA.^[4] It also found use in networking equipment, remote access servers, digital cellular telephones, and internet appliances, where its balance of performance and power efficiency supported emerging consumer electronics.^[5] Following DEC's acquisition by Compaq in 1998, Intel took over production and further developed the line until selling the XScale successor technology to Marvell in 2006.^[6]

Overview

Architecture

The StrongARM microprocessor family implements the ARMv4T architecture, a 32-bit reduced instruction set computing (RISC) design that supports both standard 32-bit ARM instructions and the optional Thumb mode for 16-bit compressed instructions to improve code density in memory-constrained environments.^[7]^[8] This architecture enables efficient execution of integer operations, load/store data processing, and control flow instructions, with backward compatibility to earlier ARM versions where applicable.^[7] At its core, the StrongARM features a five-stage pipeline consisting of fetch, decode (issue), execute, memory (buffer), and writeback stages, which allows for in-order instruction execution while maximizing throughput in a scalar design.^[8] The integer unit includes a 32-bit arithmetic logic unit (ALU) and barrel shifter capable of handling multiply and shift operations within the pipeline, supporting the core's focus on high-performance integer computation.^[8] Additionally, an integrated memory management unit (MMU) provides virtual-to-physical address translation using a 32-entry fully associative translation lookaside buffer (TLB) that maps 4 KB, 64 KB, or 1 MB pages, facilitating protected memory access for operating systems in embedded applications.^[8] Across the family, StrongARM processors operate at clock speeds from 160 MHz to 233 MHz, fabricated primarily on a 0.35 μm CMOS process, enabling scalable performance suitable for portable devices. Power consumption is optimized for embedded systems, exemplified by the SA-110 variant dissipating 0.5 W at 160 MHz, which underscores the design's emphasis on energy efficiency without integrated peripherals dominating the budget.^[8] This low-power profile, achieved through careful pipeline balancing and voltage scaling, positions StrongARM as a foundational choice for battery-operated computing.^[8]

Design Principles

The design of the StrongARM microprocessor emphasized achieving a high MIPS per watt ratio to suit portable and embedded applications, prioritizing power efficiency over raw desktop-level performance. This philosophy targeted power-constrained devices like personal digital assistants and network equipment, where the initial SA-110 variant achieved 184 Dhrystone MIPS at 162 MHz while dissipating just 0.5 W at 1.5 V, demonstrating a focus on maximizing performance within a sub-watt envelope.^[9] The architecture emerged from a close collaboration between Digital Equipment Corporation (DEC) and Advanced RISC Machines (ARM), drawing on DEC's high-performance RISC expertise—honed through prior projects like the Alpha processor—and ARM's core intellectual property to deliver efficient execution. This partnership enabled the integration of techniques that yielded superscalar-like throughput, such as optimized instruction scheduling and conditional clocking, without adopting the full hardware complexity of superscalar designs like out-of-order execution units. The resulting single-issue core provided balanced efficiency for embedded workloads while maintaining compatibility with the ARMv4 instruction set in a single sentence.^[9] To minimize system-level costs and board space, later variants of StrongARM, such as the SA-1100, incorporated key peripherals on-chip, including UARTs for serial communication, general-purpose timers, and a DMA controller to offload data transfers from the CPU.^[10] Fabrication employed a 0.35 μm drawn-gate CMOS process with three metal layers, yielding a compact die size of 50 mm² for the SA-110, which supported voltage scaling from 3.3 V I/O to a core operating range of 1.65 V to 2.0 V for power optimization; later variants extended this to even lower core voltages like 1.65 V nominal. This process choice balanced density, speed, and low-power operation, contributing to the overall MIPS/watt advantage.^[10]^[9]

History

Development Origins

The StrongARM project began in the mid-1990s as a joint venture between Digital Equipment Corporation (DEC) and ARM Holdings, aimed at developing a high-performance microprocessor core based on the ARM architecture to address the growing demand for efficient RISC processors.^[11]^[12] This collaboration leveraged ARM's instruction set design while incorporating DEC's advanced fabrication capabilities, marking one of the first major partnerships to extend the ARM ecosystem beyond its initial embedded and desktop applications.^[13] The effort was spearheaded by engineers from DEC's Alpha microprocessor team, who applied their expertise in reduced instruction set computing (RISC) to focus on low-power consumption, particularly for emerging mobile computing devices.^[14] These designers recognized the limitations of scaling high-performance architectures like Alpha for battery-powered systems and turned to ARM's flexible, energy-efficient foundation as a solution.^[15] The project emphasized integrating advanced features such as conditional clocking and low-voltage operation to achieve superior performance per watt, setting the stage for portable electronics.^[13] Development progressed rapidly, with an initial prototype completed in 1995 and first silicon tape-out occurring later that year, enabling early validation of the design.^[16] A key milestone came with the February 1996 announcement of the SA-110, the inaugural StrongARM implementation, which was positioned to compete against Intel's high-end RISC offerings like the i860 and i960.^[13]^[14] This launch highlighted StrongARM's potential to deliver supercomputer-level performance at under 1 watt, influencing the trajectory of mobile processor design.^[13]

Production and Transition

Production of the StrongARM microprocessor began under Digital Equipment Corporation (DEC) following the announcement of the initial SA-110 model in February 1996, with manufacturing occurring at DEC's Hudson, Massachusetts fabrication facility.^[14]^[17] Shipments commenced shortly thereafter, ramping up significantly by 1997 as demand grew for low-power embedded applications, reaching an estimated 500,000 to 700,000 units in 1998 alone.^[18] DEC licensed the StrongARM architecture to several partners, enabling broader adoption in mobile and embedded systems; notable licensees included companies producing ARM-compatible designs for consumer devices.^[4] As part of this expansion, DEC's semiconductor operations, including the StrongARM business, were sold to Intel on October 27, 1997 for approximately $700 million, alongside a cross-licensing agreement for patents and technology.^[19] In 1998, Compaq Computer Corporation acquired DEC for $9.6 billion, integrating its remaining assets but excluding the already-transferred StrongARM division.^[20] Under Intel's ownership, StrongARM production continued through the early 2000s, with the line evolving into the XScale microarchitecture introduced in 2000 to enhance performance for wireless and handheld devices.^[21] Intel ceased new StrongARM shipments by February 2004, fully transitioning customers to XScale-based processors.^[22]

Variants

SA-110

The SA-110 represented the first implementation in the StrongARM microprocessor family, released in 1996 as a high-performance, low-power 32-bit RISC processor. It adhered to the ARM Version 4 architecture specifications, enabling compatibility with existing ARM software ecosystems while introducing optimizations for embedded applications. Initial production models operated at clock speeds of 100 MHz, 160 MHz, and 200 MHz, with later variants reaching up to 233 MHz; at 160 MHz, it achieved 185 Dhrystone 2.1 MIPS, establishing strong efficiency for its era.^[23]^[24]^[25] Key on-chip memory features included a 16 KB instruction cache and a 16 KB write-back data cache, both organized as 32-way set-associative structures with 32-byte line sizes to support efficient code execution and data handling in resource-constrained environments. The design incorporated a memory management unit (MMU) for virtual memory support and an 8-entry write buffer to reduce bus contention, prioritizing seamless integration into systems requiring real-time performance. These elements made the SA-110 suitable for demanding tasks without excessive external hardware.^[24]^[25] Housed in a 144-pin thin quad flat pack (TQFP) for compact board layouts, the SA-110 targeted portable consumer electronics like personal digital assistants (PDAs) and set-top boxes for interactive media. Fabricated using a 0.35 μm CMOS process with three layers of metal interconnect and approximately 2.1 million transistors, the die spanned 50 mm², balancing density and yield. Power efficiency was a hallmark, with typical consumption of 170 mW at 160 MHz under normal operation and a maximum of 1 W at 233 MHz, complemented by idle and sleep modes drawing under 50 μA to extend battery life in mobile devices.^[10]^[24]^[26]

SA-1100

The SA-1100, introduced in September 1998 as the second member of the StrongARM family, evolved from the SA-110 design by integrating additional peripherals and system logic tailored for portable and embedded applications. It featured a 32-bit ARM-compatible RISC core operating at clock speeds up to 220 MHz, achieving up to 250 Dhrystone 2.1 MIPS at 220 MHz.^[27]^[28] Significant improvements included a larger cache hierarchy with a 16 KB instruction cache, an 8 KB write-back data cache, and a 512-byte mini-data cache for write buffer bypass, enhancing efficiency over prior variants; the memory management unit was upgraded to the ARMv4 architecture with dual 32-entry translation lookaside buffers supporting 4 KB, 8 KB, and 1 MB page sizes for improved virtual memory handling. Fabricated using a 0.35 μm CMOS process with a 1.5 V core and 3.3 V I/O, it reduced power consumption to less than 0.5 W under typical loads at up to 220 MHz, enabling longer battery life in mobile devices. The die measured about 75 mm², balancing integration and cost.^[27] The SA-1100 added support for synchronous DRAM (SDRAM) via a dynamic memory controller handling up to 128 MB across four 32-bit banks, along with enhanced I/O interfaces such as a PCMCIA controller for one or two sockets, USB, UARTs, and general-purpose I/O pins. These features made it suitable for compact systems requiring multimedia and connectivity. It was prominently used in Compaq iPAQ personal digital assistants, powering early handheld computing platforms.^[27]^[29]

SA-1110

The Intel StrongARM SA-1110 microprocessor, introduced in 2000, represents a multimedia-focused evolution in the StrongARM family, emphasizing integrated peripherals for display, connectivity, and low-power operation in handheld devices. Operating at clock speeds of up to 206 MHz, it achieves 235 Dhrystone 2.1 MIPS performance while maintaining power efficiency suitable for battery-constrained applications.^[30] Fabricated using a 0.35 μm process technology, the SA-1110 consumes less than 0.5 W in typical run mode at full speed, with idle and sleep modes further reducing power to 75–100 mW and 40–50 μA, respectively, enabling extended battery life in portable systems.^[31]^[32] A core addition for multimedia applications is the integrated LCD controller, which supports resolutions up to 1024×1024 pixels in monochrome, grayscale, or color modes (up to 65,536 colors for active-matrix displays), with dual-scan DMA channels for efficient frame buffer management and off-chip video access.^[30] Complementing this, the processor includes a 12 Mbps USB 1.1 device controller with three endpoints for bulk and control transfers, an IrDA interface supporting up to 4 Mbps for wireless communication, and a multimedia communications port (MCP) with synchronous serial port (SSP) for audio and codec integration, such as with Philips UCB1200 devices. The memory subsystem features a controller for up to 256 MB of SDRAM across four banks, alongside support for ROM, Flash, SRAM, and PCMCIA interfaces, with a 6-channel DMA engine to handle data transfers for video and audio streams without CPU intervention.^[30] Packaged in a 256-pin micro ball grid array (mBGA) for compact integration, the SA-1110 targets advanced personal digital assistants (PDAs) and early portable media players, powering devices like Compaq iPAQ Pocket PCs with features for multimedia content handling and connectivity.^[32] Its design builds on the StrongARM architecture under Intel's stewardship following the transition from Digital Equipment Corporation, prioritizing peripheral integration over raw CPU speed for consumer-oriented embedded systems.^[32] The processor's 16 KB instruction cache and 8 KB write-back data cache (plus 512-byte mini-data cache) ensure efficient execution of multimedia workloads, with power management modes that disable unused peripherals to minimize dissipation.^[30]

SA-1500

The SA-1500 represents the culminating variant in the StrongARM family, developed by Digital Semiconductor's Palo Alto design team as an advanced multimedia-oriented processor. It integrates a 32-bit ARM V4 RISC CPU core with an attached media processor (AMP) coprocessor, enabling efficient handling of signal processing tasks through specialized SIMD instructions and a 64-bit long instruction word (LIW) architecture for the AMP. This design targeted embedded applications requiring high computational density for media workloads, such as MPEG-2 video decoding at main profile/main level and voice over IP processing. Following Digital Equipment Corporation's semiconductor division acquisition by Intel in 1999, the SA-1500 entered limited production around 2000.^[33]^[34]^[35] Fabricated on a 0.28 μm three-metal-layer CMOS process with 3.3 million transistors, the SA-1500 features a die size of 60 mm² (7.56 mm × 7.91 mm). It supports clock frequencies from 150 MHz to 300 MHz via dynamic scaling, with internal core voltage ranging from 1.5 V to 2.0 V and 3.3 V I/O. Power dissipation remains under 0.5 W at 150 MHz (optimized for low-power modes) and below 3 W at 300 MHz, facilitated by 333 independently controlled clocks generated by on-chip PLLs with skew under 80 ps. The memory subsystem includes a 16 KB four-way set-associative instruction cache, a 16 KB write-back data cache, a 1 KB mini-data cache for low-latency access, a 256-byte streaming buffer, and a 128-byte prefetch buffer, all sharing external SDRAM. The AMP augments this with 64 general-purpose registers, a fully pipelined ALU, MAC unit, and floating-point unit, plus a 512-instruction writable control store for custom media routines.^[34]^[33] Interface capabilities emphasize flexibility for embedded integration, with a 100 MHz synchronous DRAM bus (SBUS) delivering peak bandwidth of 800 MB/s (sustained ~500 MB/s) and a 50 MHz programmable peripheral bus (PBUS) for connecting ROM, SRAM, flash, or PC-style I/O devices. The PBUS supports bus adapters for 32-bit PCI or PCMCIA interfaces, enabling connectivity to standard peripherals. Fifteen descriptor-based DMA channels handle high-throughput data movement between buses and memory, reducing CPU overhead in multimedia pipelines. Packaging options include a 240-pin MQFP for lower-power designs under 2 W or a 256-pin plastic ball grid array (PBGA) for full-speed operation. These elements positioned the SA-1500 for use in networking gear like soft modems and video conferencing systems, as well as broader embedded industrial applications demanding efficient media acceleration.^[34]^[33] The SA-1500's architecture prioritized sustained performance in real-world scenarios over peak synthetic metrics, achieving over 2 billion 16-bit operations per second through combined ARM and AMP execution. For instance, its SIMD capabilities include single 32-bit floating-point multiply-accumulate, dual 18-bit integer multiply-accumulate, and quad 9-bit sum-of-absolute-differences operations, ideal for DSP algorithms in audio/video processing. While specific Dhrystone benchmarks are not detailed in primary design documents, the processor's enhancements over prior StrongARM variants—such as doubled clock rates and media-specific hardware—implied substantial gains in integer throughput for embedded tasks. Its low-volume production marked the end of DEC-originated StrongARM development, paving the way for Intel's subsequent XScale architecture.^[34]^[33]

Innovations

StrongARM Latch

The StrongARM latch is a dynamic latch circuit topology that utilizes pass-transistor logic for differential input sampling, enabling efficient precharge and evaluation phases while minimizing clock loading. This design achieves zero static power consumption and reduces dynamic clock power relative to conventional static CMOS latches through lower capacitive switching on clock lines. Originally proposed by Toshiba researchers for high-speed data link applications, the topology features a clocked NMOS differential pair for initial amplification, followed by cross-coupled NMOS and PMOS pairs for regenerative latching.^[36] In the StrongARM microprocessor, DEC implemented a modified version of this latch in pipeline registers to support rapid data transfer between stages. The pass-transistor inputs allow sampling at lower voltages without significant performance degradation, facilitating operation at supply voltages as low as 2.0 V while maintaining clock frequencies up to 160 MHz. This implementation contributes to the processor's overall efficiency, yielding MIPS/Watt gains through reduced energy per instruction cycle compared to prior ARM designs. The latch's delay is modeled by the equation

t_d = \frac{C_L V_{dd}}{I_{on}},

where C_L is the load capacitance, V_{dd} is the supply voltage, and I_{on} is the on-current of the driving transistors; key optimizations in the StrongARM variant minimize C_L via compact cross-coupled structures, thereby enhancing speed and power efficiency.

Pipeline and Cache Features

The StrongARM family employs a five-stage integer pipeline—fetch, decode, execute (including ALU and shift operations), memory access, and write-back—with speculative execution to distribute tasks evenly and maximize throughput, with most instructions executing in a single cycle per stage under ideal conditions. This design incorporates hazard detection for data dependencies and aborts to preserve pipeline state and minimize stalls.^[24]^[16]^[3] The memory subsystem features a Harvard architecture separating instruction and data paths, with a 16 KB instruction cache (I-cache) that is 32-way set-associative using 32-byte blocks and virtual addressing for efficient code fetching. Complementing this is a data cache (D-cache) of 16 KB in write-back mode for the SA-110 (8 KB in later variants like SA-1100), also 32-way set-associative with virtual addressing and round-robin replacement, enabling burst transfers and C-bit control for cacheability to optimize data access latency.^[25]^[12]^[16] Key innovations in power management include clock gating through idle and sleep modes, which halt unnecessary clock signals to idle units and reduce dynamic power to as low as 20 mW in idle at 100 MHz, alongside dynamic voltage scaling in advanced implementations to adjust supply from 1.65 V to 2.0 V based on workload for further savings. For multiprocessor environments, the caches provide coherency hints via software-managed invalidations, as hardware coherency is absent and virtual addressing requires explicit consistency maintenance to avoid stale data across cores.^[24]^[37]^[16] Overall performance throughput is approximated by the equation:

\text{Throughput} \approx \text{clock speed} \times \text{IPC}

where IPC (instructions per cycle) reflects the pipeline's efficiency against branch and cache miss penalties.^[38]

Applications and Legacy

Notable Devices

The Compaq iPAQ h3600 series, released in 2000, was one of the first widespread personal digital assistants (PDAs) to feature the StrongARM SA-1110 processor operating at 206 MHz.^[39] This series ran Microsoft's Pocket PC 2000 operating system, based on Windows CE 3.0, and included 16 MB of flash ROM and 32 MB of RAM, enabling features like color touchscreen displays and expandable storage via CompactFlash cards.^[40] The iPAQ's adoption of the StrongARM contributed to its popularity in the early PDA market, with models like the iPAQ 3630 and 3650 becoming staples for mobile productivity.^[41] The Psion Series 7, introduced in 2000, incorporated the StrongARM SA-1100 processor at 133 MHz, positioning it as a versatile handheld computer for business users.^[42] It featured a backlit 640x480 color touchscreen, 16 MB of RAM (expandable to 32 MB), and 16 MB of ROM running the EPOC32 operating system, later evolving into Symbian OS.^[43] Expandable memory through CompactFlash and PC Card slots allowed for additional storage and peripherals, making it suitable for document editing, email, and basic web browsing on the go.^[44] The Apple Newton MessagePad 2100, launched in 1997, utilized the StrongARM SA-110 processor at 162 MHz, marking a significant upgrade in the Newton PDA line before its discontinuation.^[45] With 4 MB of DRAM and 4 MB of flash RAM, it supported handwriting recognition and personal information management via Newton OS 2.0, emphasizing portability through the processor's power efficiency.^[45] The HP Jornada 568, released in 2001, employed the StrongARM SA-1110 at 206 MHz, targeting mobile professionals with its slim form factor and Microsoft Pocket PC 2002 software. Equipped with a 640x480 color display, 64 MB of RAM, and CF expansion, it facilitated tasks like scheduling and data synchronization in a compact design. The Yakumo Alpha PDA, released in 1998, used the StrongARM SA-110 processor, providing a compact device for personal organization with expandable memory slots.^[4]

Performance and Impact

The StrongARM family of processors achieved notable performance for its era, with the SA-110 delivering up to 268 Dhrystone 2.1 MIPS at 233 MHz while consuming just 420 mW in normal mode.^[46] Earlier configurations, such as the SA-110 at 160 MHz, provided 185 MIPS at 450 mW, emphasizing its balance of speed and efficiency. In comparison to contemporaries like the MIPS R4300, which reached 125 Dhrystone 2.1 MIPS at 100 MHz with 1.8 W power draw, StrongARM demonstrated superior power efficiency, achieving a MIPS/Watt ratio of about 638 versus 69 for the R4300.^[47]^[48] This efficiency helped establish StrongARM as a cornerstone for ARM's expansion into mobile computing, influencing the architecture's shift toward low-power, high-performance designs essential for battery-constrained devices. The processors' success underscored ARM's viability in embedded systems, directly inspiring Intel's XScale line, which built upon StrongARM's microarchitecture to further optimize for portable applications.^[4] StrongARM's innovations in pipeline depth and cache management also contributed to the foundational principles seen in later ARM developments, including the Cortex-A series, which prioritized similar trade-offs for sustained mobile dominance.^[6] StrongARM facilitated a pivotal transition to ARM-based processors in personal digital assistants (PDAs), powering influential devices like the Compaq iPAQ and Apple's Newton MessagePad 2100, thereby accelerating ARM's adoption in the handheld market. By the early 2000s, this momentum helped ARM capture a substantial share of the PDA and embedded sectors, setting the stage for its overwhelming prevalence in mobile platforms.^[14] However, the absence of an integrated floating-point unit limited StrongARM's suitability for compute-intensive tasks, a shortfall remedied in successors like XScale through added coprocessor support.^[46]

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[47]
[PDF] StrongARM SA-110 Microprocessor
The SA-110 is a general-purpose, 32-bit RISC microprocessor with a 16 Kbyte instruction cache. (Icache); a 16 Kbyte write-back data cache (Dcache); a write ...Missing: 1110 | Show results with:1110
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[PDF] Chart Watch: Mobile Processors - Ardent Tool of Capitalism
Mar 9, 1998 · The table and the chart in the upper right show the performance/ power ratio for a number of embedded CPUs and notebook processors; the chart ...