October 2006
Intermediate to advanced
544 pages
20h 23m
English
Content preview from Digital Systems: Principles and Design
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269Implementation of Combinational Logic by Standard ICs and Programmable ROM Memories
A combinational circuit may be complex enough to assemble using standard ICs. We wish to
design a circuit for a character in a line printer, which gives a 64-bit output for each pixel in
the character when the ASCII code of that is given as the input (refer section 11.1.3 for
ASCII codes). These 64-bits are input to the printer head pins driving circuit. It means that
we need a combination circuit for each ASCII character which has n = 8 (7-bit ASCII code
+ one parity bit) and m = 64. Another example is of a LCD line display or multi line display
circuit, that
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