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Online arithmetic with radix 2 addition

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ghattas.akkad

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hello guys i am having trouble working with OLA radix 2 SD addition MSDF
if i have an 8 bits range unsigned numbers and a set of {-1,0,+1}
with the following table

+1 ---> 01
0 ---> 00
0 ---> 00
-1 ---> 10

if i want to make a-b = c
i do not understand how the operation of a-b is performed
if we have 25-10 = 15
25:0001 1001
10:0000 1010

if we map each 2 consecutive digits to the ones in the table
how do i perform the computation
so i could implement it in hardware
can you please explain with figure or detailed numeric examples ?

thank you
 

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