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Multi-Checks for Increasing the Reliability of Serial Data Transfer During Microprogram-Controlled Receipt

IP.com Disclosure Number: IPCOM000057670D
Original Publication Date: 1988-Jun-01
Included in the Prior Art Database: 2005-Feb-15

Publishing Venue

IBM

Related People

Authors:
Gerwig, G Strubbe, G [+details]

Abstract

For increasing the reliability of serial data transfer during microprogram-controlled receipt, each data bit is read in several times. The validity of the data bits is determined by majority decision. An error counter indicates the rate at which errors occur during transfer. For simple serial data transfer, parity bit checking is the only means of avoiding transfer errors. However, the parity bit detects only errors caused by the erroneous transfer of an odd number of bits in a byte, while errors resulting from the erroneous transfer of an even number of bits remain undetected. To remedy this, further safety measures are provided. At the port of a microprocessor, serially transferred data bits are successively available for a certain time.