MONITOR CIRCUIT FOR INTERNAL PART OF DEVICE

摘要

PURPOSE:To precisely monitor the connection state of circuit units by inserting a pseudo random signal into the pay road of a free cell and adding a parity bit so as to transmit it to a second circuit unit at a first circuit unit. CONSTITUTION:In the first circuit unit, an inspection pattern insertion circuit 1 inserts the pseudo random signal into the pay road of the free cell. A parity addition circuit 3 adds the parity bit to the signal and transmits it to the second circuit unit. In the second circuit unit, a parity inspection circuit 11 inspects the parity of the signal obtained by adding the parity to the pseudo signal.