Term
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Definition
$sp Stack
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V
grow and shrink in size
^
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Heap
$gp Static Data
$pc text
reserved
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Term
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Definition
stack push: push value of $t0, total:
add i $sp, $sp, -4
sw $t0, 0($sp)
addi $sp, $sp, -4
lw $t1, total
sw $t1
pop:
lw $s0, 0($sp)
addi $s0, $sp, 4
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Term
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Definition
first 4 go to $a0-$a3
the rest are pushed in reverse order to the top of the stack
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Term
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Definition
| $fp used to reference extra arguments and save #a's |
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Term
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Definition
| #sp used to reference local variables |
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Term
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Definition
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Term
digital computer
microchip
locig circuits |
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Definition
components constructed using integrated circuits on microchips
contain digital logic circuits
manipulate digital electrical signals built using logic gates |
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Term
| Combinational and Sequential Circuits |
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Definition
comb: output only depens on the current input
sequ: maintains a state(memory), output also depends upon the prior input
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Term
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Definition
continuous electrical signals that vary in time
intensities range |
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Term
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Definition
non-continuous signals
two-discrete voltage levels
high:1,off; low:0,on |
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Term
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Definition
identity: a+0 = A, A*1 = A
zero and one laws: A+1=1, A*0=0
inverse: A + 7A = 1
Commutative: A+B=B+A
Associative: A+(B+C)=(A+B)+C
Distributive: A*(B+C) = (A*B)+(A* C) |
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Term
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Definition
NAND and NOR:
can be used exclusively to build any boolean expression
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Term
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Definition
actual hardware uses collections of gates to create large machines
-gates are only sold in units (IC's)
-components are etched directly on the chip |
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Term
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Definition
| output based entirely on given inputs, can have multiple outputs |
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Term
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Definition
| selects from one of multiple input lines and directs it to a single output line |
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Term
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Definition
| multiple inputs are used to select a specific output line |
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Term
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Definition
| compares 2 input words, returning 1 if they are equal, and 0 otherwise |
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Term
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Definition
clock tick/cycle: every iteration of a clock
clock cycle time: time from beginning of a cucle to end of cycle
clock rate: frequency of cycles per second 1hz=1cycle/sec
high edge, low edge, rising edge
propagation delay: length of time which starts when the input to a logic gate becomes stable and valid, to the time that the output of that logic gate is stable and valid |
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Term
| Registers and Logic Circuits |
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Definition
| 32 flip flop circuits can be combined to form a 32 bit register |
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