BUFFER CONTROL METHOD AND BUFFER CONTROLLER

Japanese Patent JP3765931

B2

PROBLEM TO BE SOLVED: To avoid overflow of a buffer by reducing consumption of a buffer memory by comparing inputted data with singular or plural data patterns, recording a code to indicate a coincident data pattern in the buffer memory when the inputted data are coincident with at least one of the data patterns, reproducing and outputting data corresponding to the code. SOLUTION: When the data are received by a shift register 36, the received data are compared with patterns R: 32 to 32n as preset data patterns in a comparison part 34 and the data and a pattern number as a code to indicate the data pattern are transmitted to a buffer managing part 14 by a cache control part 30. Relating to the buffer managing part 14 a comparison result in the cache control part 30 is judged by a pointer control part 20, when it is noncoincident, the data are written in the buffer memory 26 and when it is coincident, the pattern number is written in the buffer memory 26 based on the pattern number and an address to be indicated by a write pointer.