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US 5,636,228 AGranted
Scan register with decoupled scan routing
AssigneeMotorola, Inc.
InventorsClaude Moughanni, Jeff Maguire
Life of this patent
Estimating the term…
Abstract
A scan register (80) provides for the decoupling of the scan data output signal (117) from the data output signal (116). This is provided through a tri-statable device (88), which is controlled by a scan enable signal or by the scan clock signal.
Claims14
A scan register comprising:
- circuitry for receiving a data signal;
- circuitry for receiving a scan signal;
- circuitry, coupled to said circuitry for receiving said data signal, for outputting said data signal;
- and
- circuitry, coupled to said circuitry for receiving said scan signal, for outputting said scan signal, wherein said outputting circuitry for said data signal is separate from said outputting circuitry for said scan signal.
2 more elements
A processor comprising:
- logic circuitry comprising a plurality of scan registers;
- and
- circuitry for enabling and disabling a scan operation through said plurality of scan registers,
- wherein a scan register within said plurality of scan registers comprises:
- circuitry for outputting a data signal;
- circuitry for receiving a scan signal;
- circuitry for outputting said scan signal;
- and
- circuitry for decoupling said circuitry for outputting said scan signal from said circuitry for outputting said data signal.
6 more elements
A register comprising:
- a master portion operable for receiving a data signal, a scan signal, a data clock signal, and a scan clock signal;
- and
- a slave portion operable for receiving said scan signal or said data signal,
- wherein said slave portion further comprises:
- a first inverter coupled between said master portion and a node;
- a second inverter coupled to said node;
- circuitry, coupled to said second inverter, for outputting said data signal;
- a third inverter coupled to said circuitry for outputting said data signal and said node;
- circuitry for outputting said scan signal;
- and
- a logic circuit coupled between said node and said circuitry for outputting said scan signal.
8 more elements
Dependencies are inferred from the claim text.