Such networks may be strictly combinational logic, in which their output state is only a function of the present state of their inputs; or may also contain sequential elements, where the present state depends on the present state and past states; in that sense, sequential circuits are said to include " memory " of past states.
32.
Architectures with instruction sets implemented by complex microprograms included the IBM System / 360 and Digital Equipment Corporation VAX . The approach of increasingly complex microcode-implemented instruction sets was later called ROMs ( instead of combinational logic ) mainly for instruction decoding, and let a simple state machine ( without much, or any, microcode ) do most of the sequencing.
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The advantage of using a ROM in this way is that any conceivable function of all possible combinations of the " m " inputs can be made to appear at any of the " n " outputs, making this the most general-purpose combinational logic device available for " m " input pins and " n " output pins.
34.
The BIST name and concept originated with the idea of including a pseudorandom number generator ( PRNG ) and cyclic redundancy check ( CRC ) on the IC . If all the registers that hold state in an IC are on one or more internal scan chains, then the function of the registers and the combinational logic between them will generate a unique CRC signature over a large enough sample of random inputs.
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