Mechanism for enabling compliance with the IEEE standard 1149.1 for boundary-scan designs and tests

A method for reproducing the functions of a TAP controller that complies with the IEEE boundary-scan standard 1149.1 in a device not having a TAP controller that complies with said standard, the method comprising:

• providing at least one device without a TAP controller;
• coupling a TAP emulator to said device;
• providing an enabler for enabling said device to comply with said standard;
• and
• providing compliance signals through said enabler to said TAP emulator.

A system that functions in compliance with the IEEE boundary scan standard 1149.1 using internal architecture that is not in compliance with said standard, the system comprising:

• one or more non-compliant scan cells, in a device, that have an internal architecture that does not comply with said standard;
• and
• an enabler for providing compliance signals to said scan cells;
• wherein said scan cells and said enabler enable compliance with said standard.

A system that functions in compliance with the IEEE boundary scan standard 1149.1 using internal architecture that is not in compliance with said standard, the system comprising:

• at least one device without a TAP controller;
• a TAP emulator coupled to said device;
• and
• an enabler providing scan control signals to said TAP emulator;
• wherein said emulator and said enabler enable compliance with said standard.

An apparatus comprising:

• a test access port (TAP) adopted to provide TAP output compliance signals;
• and
• multiplexing and decoding circuitry, adapted to receive said TAP output compliance signals and to provide said TAP output compliance signals for an embedded boundary scan testing architecture;
• and
• scan control circuitry for receiving said TAP output signals for use with a TAP emulator, wherein the apparatus enables compliance with the IEEE standard 1149.1.

A method for testing a device with internal architecture that is not compliant with the IEEE boundary-scan standard 1149.1 by supplementing the internal architecture with external architecture so that the external architecture and the internal architecture cooperate to provide testing compliant with said standard, the method comprising:

• providing a device on a chip including one or more non-compliant scan cells having an internal architecture that is not compliant with said standard;
• providing an enabler external to said chip;
• and
• providing compliance signals through said enabler to said scan cells;
• wherein said compliance signals and said enabler enable compliance with said standard using said scan cells.

A method for reproducing the functions of a TAP controller compliant with the IEEE boundary-scan standard 1149.1 in a device not having a TAP controller compliant with said standard, the method comprising:

• providing at least one device on a chip without a TAP controller compliant with said standard;
• coupling a TAP emulator to said device;
• providing an enabler external to said chip;
• and
• providing compliance signals through said enabler to said TAP emulator;
• wherein said compliance signals, said emulator and said enabler enable the TAP emulator to emulate the function of a TAP controller compliant with said standard.

A system for testing a device with internal architecture that is not compliant with the IEEE boundary-scan standard 1149.1 by supplementing the internal architecture with external architecture so that the external and internal architectures cooperate to provide testing that is compliant with said standard, the system comprising:

• one or more non-compliant scan cells, on a chip, that have an internal architecture that does not comply with said standard;
• and
• an enabler external to said chip providing compliance signals to said scan cells;
• wherein said scan cells, said compliance signals, and said enabler enable compliance with said standard.

A system for supplementing a testing system having a device with internal architecture that is not compliant with the IEEE boundary-scan standard 1149.1 by supplementing the internal architecture of the testing system with external architecture so that the external and internal architectures are capable of cooperating to provide testing that is compliant with said standard, the system comprising:

• at least one device without a TAP controller compliant with said standard;
• a TAP emulator coupled with said device;
• and
• an enabler providing scan control signals to said TAP emulator;
• wherein said emulator and said enabler enable the emulator to emulate a TAP controller compliant with said standard.