Microprocessor with a built-in section for the cyclical redundancy check and method for performing cyclic redundancy checking operations with the use of this

摘要

Arithmetic unit (alu) for a microprocessor with a shift circuit (sft), the optionally a crc - operation or a shift operation, witha plurality of input lines to the parallel taking-over the input data, which in the data bits (0 – 7) of the shift circuit (sft) are taken over, and in the case of the crc - operation for transferring of a start of a binary value as a basic value for a crc - calculation,a a - bits - line, the serially one bit (rr) of receiving data bits, for which the crc - operation is to be carried out,a function of producing a direction (exor), the one or more exclusively - or - gate, and the the data bits (0 – 7) of the sliding circuit and the data bit (rr) of the a - bits - line receives,a selecting means (sl), which in the case of the crc - operation the output data of the function of producing a direction (exor) and in the case of the shift operation the data bits (0 – 7) of the sliding circuit, wherein the sliding circuit displaced, the selected data bits as the data bits (0 – 7) of the sliding circuit and the bit (rr) of the a - bits - line, anda plurality of output lines to the parallel output of the data bits..