HIGH SPEED VARIABLE LENGTH CODE DECODER AND HIGH SPEED VARIABLE LENGTH CODE DECODING METHOD

摘要

PROBLEM TO BE SOLVED: To decode two codes for each cycle and to attain effective high speed processing by storing received serial data to two latch circuits and using two barrel shifters so as to generate a window output sequence. ;SOLUTION: Serial data given to a buffer memory 50 are outputted to latch circuits 101, 102 based on a control signal READ, a CARRY signal and a clock signal CLK. Then the data in a buffer memory 50 and the latch circuits are given to a 1st barrel shifter 103 by the CARRY and a 1st window output sequence 117 is generated. The 2nd barrel shifter 104 receives an output sequence of the sequence 117 and an output sequence of a relay circuit 105 and provides an output of a 2nd window output sequence by the control of the memory device 200. Since two codes are decoded for each cycle by an adder 310 of an accumulation block 300, two latch circuits 320, 330 and an MUX 340, the configuration is simplifier and high speed processing is conducted effectively.;COPYRIGHT: (C)1997,JPO