A CSIC implementation with POCSAG decoder and microcontroller for paging applications

Abstract

This paper presents a CSIC (Customer Specification Integrated Circuit) implementation, which includes a 512/1200/2400 bps POCSAG decoder, PDI2400 and MC68HC05 changed by PANTECH. It can receive all the data with the rate of 512/1200/2400 bps of a single clock of 76.8 KHz. It is designed to have maximum 2 own frames for service enhancement. To improve receiver quality, a preamble detection considering frequency tolerance and a SCW (Synchronization Code Word) detection at every 4 bit is suggested. Also we consider an error correction of address and message up to 2 bits. Furthermore, it is possible with proposed PF (Preamble Frequency) error to achieve a battery life increase due to the turn-off of RF circuits when the preamble signal is detected with noises. The chip is designed using VHDL code from PDI2400 micro-architecture level. It is verified with VHDL simulation software of PowerView. Its logic diagrams are synthesized with VHDL synthesis software of PowerView. Proposed decoder and MC68HC05 CPU of MOTOROLA are integrated with about 88000 transistors by using 1.0 /spl mu/m HCMOS process and named MC68HC05PD6. It is proved that the wrong detection numbers of preamble of noises are significantly reduced in the pager system that uses our chip through the real field test. The system receiving performance is improved by 20% of average, compared with other existing systems.