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12 Cards in this Set
- Front
- Back
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CISC |
- Instructions of uniform length - Large number of general purpose registers - Arithmetic operations on register values, as opposed to values acquired from memory |
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RISC |
- Simple instructions, just lots of them - More efficient compilers are easy to develop for - Simplicity allows ILP to take place. |
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Important instructions - add |
add $s1, $s2, $s3 -> $s1 = ($s2 + $s3) |
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Important instructions - subtract |
subtract $s1, $s2, $s3 -> ($s2 + $s3) - $s1 |
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Important instructions - Load word |
lw $s1, 20($s2) -> get (20+$s2) in memory, store at $s1 |
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Important instructions - Store word |
$s1, 20($s2) -> update memory location (20+$s2) with the value of $s1 |
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Important instructions - Beq |
Beq $s1, $s2, 25 -> if $s1 == $s2, go to PC + 4 + 25 |
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Important instructions - Bne |
Bne $s1, $s2, 25 -> if $s1 /= $s2, go to PC + 4 + 25 |
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Arithmetic Instructions use ... type decoding |
R-type |
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Addressing Instructions use ... type decoding |
I-type |
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Fetch-decode-execute |
1) Program requests information 2) Instructions are sent to main memory 3) Program instructions are fetched from main memory 4) Processor decodes the instruction 5) Processor executes the instruction |
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Multiplexers |
The processor has to model all possible data flows. The multiplexer controls the data flow. |
