Hello!
I need to implement a set greater than and a branch less or equal in my 16 bit ALU design,but I'm having many difficulties.
I know that in a set greater than a>b equals a-b>0 ,but I don't know how to work out from that and implement it in my design(which type of gates to use and that).
The same happens with branch less or equal.I already have a branch equal,but I don't know how to use it in order to get a ble.
Any help is really appreciated!
Typically you run the calculation through the ALU and then examine the overflow and carry flags in your branch logic.
The 7485 compares two 4-bit numbers, and tests if one is larger, smaller or equal to the other. The logic diagram is shown in the datasheet.
http://www.cs.smith.edu/~thiebaut/270/datasheets/sn74ls85rev5.pdf
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