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Address Decoding Circuit Design

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Leon.h

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Hello, I am designing an address decoder that responds to the address range 3E0 to 3EF, and would like to know the most efficient way to implement it? I have thought of using a digital comparator, but are there any other ways? Your help would be appreciated!
 

crust

Member
From the information you have provided, I'll assume your effective addresses are 10 bits wide. You can obviously ignore the lowest four bits, so you only need examine the top 6 bits.

You could accomplish this with a PAL very easily, or you could use some discrete logic such as AND/OR, NAND, etc. Basically if bits 9:5 are logic high and bit 4 is logic low, then you want to assert your output.
 
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