Monitoring device for monitoring internal signals during initialization of an electronic circuit

Abstract

The invention provides a device for monitoring electronic circuit units during an initialization phase. The device has at least one internal data line () for forwarding internal data () in the electronic circuit unit () and at least one data connection line () for outputting the internal data from the electronic circuit unit () and for inputting external data () into the electronic circuit unit (). A changeover unit (), which is intended to change over the data connection line () either to the internal data line () or to internal signal lines (), and a combinational logic unit () for combining an initialization signal (), which is provided by the electronic circuit unit () to be monitored, with an external changeover signal (), which is supplied via a changeover signal input () of the electronic circuit unit () to be monitored, are also provided. An activation signal (), which is output by the changeover unit (), is used to change over the data connection line to the internal signal lines () when the initialization signal () indicates an initialization mode of the electronic circuit unit ().