MHz for connecting to peripherals and the SA-1501 companion chip. The AMP implemented a long instruction word instruction set containing instructions designed for multimedia, such as integer and floating-point multiply–accumulate and SIMD arithmetic. Each long instruction word is 64 bits wide and specifies an arithmetic operation and a branch or a load/store. Instructions operate on operands from a 64-entry 36-bit register file, and on a set of control registers. The AMP communicates with the SA-110 core via an on-chip bus and it shares the data cache with the SA-110. The AMP contained an ALU with a shifter, a branch unit, a load/store unit, a multiply–accumulate unit, and a single-precision floating-point unit. The AMP supported user-defined instructions via a 512-entry writable control store. The SA-1501 companion chip provided additional video and audio processing capabilities and various I/O functions such as PS/2 ports, a parallel port, and interfaces for various peripherals. The SA-1500 contains 3.3 million transistors and measures 60 mm2. It was fabricated in a 0.28 µm CMOS process. It used a 1.5 to 2.0 V internal power supply and 3.3 V I/O, consuming less than 0.5 W at 100 MHz and 2.5 W at 300 MHz. It was packaged in a 240-pin metal quad flat package or a 256-ball plastic ball grid array. StrongARM latch The StrongARM latch is an electronic latch circuit topology first proposed by Toshiba engineers Tsuguo Kobayashi et al. and got significant attention after being used in StrongARM microprocessors. It is widely used as a sense amplifier, a comparator, or just a robust latch with high sensitivity. References Further reading "StrongARM-1500 Grapples With MPEG-2". (8 December 1997). Microprocessor Report. Halfhill, Tom R. (19 April 1999). "Intel Flexes StrongArm With New Chips". Microprocessor Report. Litch, Tim; Slaton, Jeff (March/April 1998). "StrongARMing Portable Communications". IEEE Micro. pp. 48–55. Santhanam, S. et al. (November 1998). "A low-cost, 300-MHz, RISC CPU with attached media processor". IEEE Journal of Solid-State Circuits, vol. 33, no. 11. pp. 1829–1839. Turley, Jim (13 November 1995). "StrongArm Punches Up ARM Performance". Microprocessor Report. Turley, Jim (15 September 1997). "SA-1100 Puts PDA on a Chip". Microprocessor Report. Witek, Rich; Montanaro, James (1996). "StrongARM: A high-performance ARM processor". Proceedings of COMPCON '96, pp. 188–191. 32-bit microprocessors ARM processors DEC microprocessors Intel microprocessors