Operation of a Microprocessor Within a PCS

The microprocessor has become the work horse of the modern electronics communication industry. A microprocessor generally refers to a CPU on a single silicon chip, but exceptions have been made when the CPU includes particularly interesting design ideas. The important characteristics of a microprocessor are the widths of its internal and external address bus and data bus and instruction, its clock rate, and its instruction set. A single chip microprocessor may include other components such as memory (RAM, ROM, PROM), memory management, caches, floating-point unit, input/output ports, and timers. Such devices are also known as microcontrollers (Glossary, 1995).

As integrated circuit densities have increased with the rapid development of integrated circuit manufacturing technology, the power and performance of microprocessors has also increased. These smaller microprocessors have relatively simple instruction sets, but they are nevertheless suitable as controllers for a very wide range of applications such as car engines and microwave ovens. The one-chip microcomputer is in many respects, a landmark development in computer technology because it reduces the computer to a small, inexpensive, and easily replaceable design component (Kempainen, 1996, 65-72).

Personal communications services (PCS) are one reason for the dynamic growth of the wireless communication market. PCS is u

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rum signals makes it ideal for use in multiple access systems. CDMA systems also support the sharing of satellite spectrum and upstream communications through the noisy lower channels of cable TV coax. Both TDMA and CDMA are modes of transmitting and receiving radio communication with the PCS GSM system (TDMA, 1995). PCS-1900 Architecture ASICs (Application Specific Integrated Circuit) are integrated circuits ("chips") which are custom designed for specialized applications. Specific combinations of integrated circuit are known as chip sets. The PCS-1900 chip set is also known as an ASIC. The PCS-1900 chip set is usually comprised of a radio subsystem, basic memory, keyboard, and a display for a complete mobile station. Inclusive in the chip set are a algorithm signal processor (ASP), a physical-layer processor (PLP), and the baseboard signal-processing functions (Kempainen, 1996, 65-72). The PSC-1900 system architecture contains five main switching entities. Operating within the GSM system, the microprocessors in the PSC-1900 chip set perform certain essential functions. The mobile switching center (MSC) performs the telephone switching functions for the network. It controls calls to and from other communications netwo
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Approximate Word count = 1677
Approximate Pages = 7 (250 words per page)

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