Patent ID: 8004298

Claim:
An integrated circuit comprising: A. functional circuitry; B. bond pads peripheral to the functional circuitry; C. first scan test circuitry including first parallel scan distributor circuitry having a serial input connected to a bond pad, a serial output, and parallel outputs, first parallel scan collector circuitry having a serial input, a serial output connected to another bond pad, and parallel inputs, and first scan path circuits, each first scan path circuit having a serial input connected with a parallel output of the first parallel scan distributor circuitry, a serial output connected with a parallel input of the first scan collector circuitry and parallel inputs and outputs connected with the functional circuitry; and D. second scan test circuitry including second parallel scan distributor circuitry having a serial input connected to the serial output of the first parallel scan distributor circuit and parallel outputs, second parallel scan collector circuitry having a serial output connected to the serial input of the first parallel scan collector circuit and parallel inputs, and second scan path circuits, each second scan path circuit having a serial input connected with a parallel output of the second parallel scan distributor circuitry, a serial output connected with a parallel input of the second scan collector circuitry, and parallel inputs and outputs connected with the functional circuitry.