Address Decoding

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Thread Starter


Joined Nov 7, 2012
Hi , I am a beginner to embedded systems and i have a question about address decoding.

1)The system BIOS resides at the highest 64K of an Intel microprocessor running in Real Mode when it boots up. The address bus size at this point is only 20 bits. Using 16K memory devices , design a decoding scheme. (hint : What is the highest 20 bit address)

Design a decoding circuit using the 74LS688 and a 74138

2)An I/O board for a PC/104 bus needs 4 buffers and 4 latches. Its base address is 240H. Design a suitable decoding scheme for this board.

Thank you so much and i appreciate it if the terminology used is basic since i just started on this module.
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