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How can a carry flag be used as borrow flag in ALU design?

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vinhphuong

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How can a carry flag be used as borrow flag?
I don't understand how we can subtract with carry by:
R1 = R2 - R3 - 1 + Carry flag.
Please anyone help me!
 

Re: ALU design questions

Ple reffer Computer Architecture by Petterson..There is a full topic explained in well manner.
 

Re: ALU design questions

Sorry, can you tell me the exact chapter or exact appendix of that book
I have that book but i cannot find the answer.
 

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