Match Generation
I | even bank fetches line |
odd bank fetches line |
100 | 100 | 101 |
101 | 110 | 101 |
110 | 110 | 111 |
Referring to the diagram to the right, we can see that the even bank will fetch line 110 when I==101 or I==110. The odd bank will fetch line 101 when I==100 or I==101.
In general, the odd SRAM bank should fetch line Lo==2N+1 when either I==2N or I==2N+1. We can write these two conditions as:
I = Lo-1 => R + O + ~Lo+1 = 11..11 => R + O + ~Lo = 11..10 I = Lo => R + O + ~Lo = 11..11We ignore the last digit of the compare: (S+C)==11..1
Similarly, the even SRAM bank fetches line Le==2N when either I==2N or I==2N-1. We can write these two conditions as follows, and once again ignore the last digit of the compare.
I = Le-1 => R + O + ~Le = 11..10 I = Le => R + O + ~Le = 11..11Read more about this topic: Sum Addressed Decoder
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