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14 Cards in this Set
- Front
- Back
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What is the significance of a Mux circuit?
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A Mux circuit accepts two inputs and based on the third control input it will determine whether the output is the first input or the second input. Acts as a conditional statement. |
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What are the components for a Mux circuit?
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2 inputs, 1 control input, and one output. 1 note gate, two AND gates, and 1 or gate. |
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what is the significance of a 4to1 Mux circuit?
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Accepts 4 inputs and outputs 1 input based on the control input of 2 bits. Acts as a conditional statement for 4 variables;
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what is the significance of a fulladder?
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a fulladder will accept 2 inputs and a cinput and the output will be all of these inputs added together; z = a + b + cin. |
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How do you multiply in MIPS? |
ex mult $t1, $t2 #$t1 * $t2 mflo $t1 #move from low (regular multiplication) mfhi $t2 |
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When using div in mips, what does the mflo and mfhi store in MIPS? |
mflo stores the whole number division, while mfhi stores the remainder. |
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If you wanted to get the negation of 0x400 (1024), how would you do it through MIPS? |
nor $t1, $0, 0x400 |
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How would you create a 32 bit mask with a hole in the 10th bit with MIPS. |
nor $t1, $0, 0x400 ----OR----- addi $t1, $0, 0xffff addi $t2, $0, 0xfbff sll $t1, $t1, 16 or $t1, $t1, $t2 ------OR------- ... |
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How would you create a program in MIPS that will flip the 10th bit of any number. |
xori, $t0, 0x400 0 xor 0 turns to 0, while 0 xor 1 turns to 1 1 xor 1 turns to 0, so xor is good to flip the 10th bit |
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FILL THE BLANK Regardless of how many programs are loaded into SPIM (MIPS simulator), only one of them has a ______ label. |
main |
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MIPS: How many bytes or bits are in a .word and .half directive. |
4 bytes in the .word and 2 bytes in .half |
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MIPS: a registers and v registers are usually used what for? |
a registers are usually used for receiving parameters, while v registers are used to return data. |
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If you are going to use a jal(Jump and Link) instruction in MIPS what must you add to the code to prevent an infinite loop? |
You must save the previous $ra (return address) in a $sp (stack pointer). So when the program is going to jump to the return address it will jump to the correct one. |
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what is a non-leaf method? |
a method that invokes itself |
