On-chip diagnostic system, integrated circuit and method

An integrated circuit comprising:

• an internal bus having a number of data lanes;
• a register arranged to store a data pattern;
• a comparator arrangement coupled to receive data signals from each of said data lanes of said internal bus and further coupled to receive said data pattern from said register, for providing a compared output;
• and,
• a decoding arrangement coupled to receive said compared output, for providing a decoded integer output signal, wherein said decoded integer output signal identifies one of said number of data lanes in the case that said one of said number of data lanes contains data signals corresponding to said data pattern stored in said register.

A method for use with an internal bus of an integrated circuit, said bus having a plurality of data lanes, comprising:

• storing a data pattern in said integrated circuit;
• comparing data signals appearing on said plurality of data lanes to said stored data pattern;
• generating at an output of said integrated circuit a first output signal that identifies one of said plurality of data lanes wherein said data signals match said stored data pattern;
• and
• further generating at an output of said integrated circuit a second output signal that indicates a state of at least some integrated circuit control signals.

Diagnostic circuitry coupled to an internal bus of an integrated circuit, said bus having a plurality of data lanes, comprising:

• means for storing a data pattern;
• means having inputs coupled to said plurality of bus lanes and to an output of said storing
• means for comparing data signals appearing on said plurality of data lanes to said stored data pattern;
• and
• means having inputs coupled to outputs of said comparing means for generating at an output of said integrated circuit a first output signal that identifies one of said plurality of data lanes wherein said data signals match said stored data pattern and a second output signal that indicates a state of at least some integrated circuit control signals.