Skorzystaj z wyszukiwarki lub indeksu alfabetycznego.
Przykłady: pci, /dev/null, functional unit, embedded system, pseudo-tty, nfs.
1 definition found
From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
scan register
A digital logic circuit which can
act either as a flip-flop or as a serial shift register
and which is used to form a scan path for testing.
The most common design is a multiplexed flip-flop:
___ ____
normal in --| \ | |
|mux |------|D Q|---- normal/scan
scan in ----|___/ | | output
| |flip|
test mode ----+ |flop|
| |
clk --------------------|> |
|____|
The addition of a multiplexor (mux) to each flip-flop's
input allows operation in either normal or test mode. The
output of each flip-flop goes to the normal functional logic
as well as to the scan input of the next multiplexor in the
scan path.
The other common design is level-sensitive scan design
(LSSD).
(2011-12-16)