Traditionally, the ISP is considered to be the final phase of
BS test session and builds the foundation for the following
functional tests [3]. The fundamental JTAG-based ISP solutions
are proposed in [4], [5] and [6], that describe processorcontrolled
test and processor-centric board test (PCBT). These
methods are based on the use of functionality of microprocessor
(uP) or microcontroller (uC) to access peripheral
components outside the uP or uC at normal operational speed
of the board. The attractiveness of PCBT-based solutions
are very high due to the usage of existing DfT structures
without any modifications. Later in this paper, the formal
characterization of ISP will be given in the terms from JTAG
and PCBT methodology.