Patent ID: 7257654

Claim:
A method in an integrated device having a JTAG interface, the method comprising: detecting by the integrated device a prescribed device input for a JTAG-based override identifying transfer of configuration values via the JTAG interface, the integrated device further comprising a PCI bus interface, a host interface, and configuration registers storing respective stored configuration values for controlling operations of at least one of the PCI bus interface or the host interface, the host interface configured for providing access by a host device to the configuration registers; receiving by the JTAG interface of the integrated device a JTAG clock and a serial input stream according to the JTAG clock; detecting within the serial input stream a prescribed instruction for writing of configuration values into respective prescribed selected configuration registers; and selectively overwriting, based on detecting the prescribed device input and the prescribed instruction, the respective stored configuration values in the prescribed selected configuration registers of the integrated device with the configuration values from within the serial input stream for modification of the at least one of the operations of the PCI bus interface or the host interface.