0 0 votes A hypothetical control unit supports 5 groups of mutually exclusive signals. what is the size of control memory in bytes if during any microinstruction atmost 1 control signal is active and the control unit supports 256 control word memory CO & Architecture co-and-architecture control-unit + – Gate Fever 2.2k views answer comment Share Follow Print See all 12 Comments 12 12 Comments reply Shivam Kasat commented Dec 22, 2018 reply Follow flag aren't there any flags in this processor! 0 0 replyShare Shivam Kasat commented Dec 22, 2018 reply Follow flag 512 bytes? 0 0 replyShare Gate Fever commented Dec 22, 2018 reply Follow flag @Shivam Kasat 0 0 replyShare Shivam Kasat commented Dec 22, 2018 reply Follow flag @Gate Fever Any explanation they gave? 0 0 replyShare Gate Fever commented Dec 22, 2018 reply Follow flag i feel that is wrong explanation, i think something is missing in the question! still i am posting the solution they've provided 0 0 replyShare Shivam Kasat commented Dec 22, 2018 reply Follow flag the question says at any point of time a single control signal is active then why do we need different bits for different grouping? If more then one control signal is supposed to be active then this would have been the correct answer total control signals =2+1+4+33+25=65 so we need 7 bits to address a control signal, and 8 bits for next address field total we need 15 bits to address an instruction=>2 bytes 256*2 bytes=512 bytes 0 0 replyShare Shivam Kasat commented Dec 22, 2018 reply Follow flag further in there solution they have multiplied 23 bits * 256 words ! shouldn't they have done it this way 3 byte* 256 words ! 0 0 replyShare Gate Fever commented Dec 22, 2018 reply Follow flag they have given atmost 1 signal is active at a time therefore it should be vertical micro programming why are u considering horizontal micro programming ?? 0 0 replyShare Shivam Kasat commented Dec 22, 2018 reply Follow flag @Gate Fever I have used vertical programing only bro. 0 0 replyShare Gate Fever commented Jan 10, 2019 reply Follow flag 512 bytes? I did this qn again.even i feel that 512 is correct answer! @Shivam Kasat pls check 0 0 replyShare Shivam Kasat commented Jan 10, 2019 reply Follow flag @Gate Fever I got 512 bytes last time as I explained above. 0 0 replyShare Gate Fever commented Jan 10, 2019 reply Follow flag yes even i think 512 for control word = 15bits = 2B for 256 control word memory = 2* 256 B = 512B 1 1 replyShare Please log in or register to add a comment.
