unit 6 single-Cycle Processor: Daatpath

Question 1

microarchitecture

Answer 1

the connection between logic and architecture. T

Question 2

microarchitecture is the specific arrangement of

Answer 2

registers, ALUs, finite state machines(FSMs), memories, and other logic building blocks.

Question 3

architectural state for the ARM processor consists of?

Answer 3

16 32-bit registers and the status register

Question 4

what are ADD, SUB, AND, and ORR

Answer 4

data processing instructions

Question 5

what are LDR and STR?

Answer 5

Memory instructions

Question 6

B stands for?

Answer 6

branch

Question 7

how do we divide our microarchitectures?

Answer 7

int two interacting parts: the datapath and the control unit

Question 8

what does the data path operate on?

Answer 8

words of data

Question 9

what does a datapath contain?

Answer 9

structures such as memories, registers, ALUs, and multiplexers

Question 10

what is the size of the 32-bit ARM architecture’s datapath?

Answer 10

32-bit

Question 11

where does the control unit receive instructions from?

Answer 11

the current instructions are received from the datapath

Question 12

what does the control unit tell the datapath?

Answer 12

how to execute the instructions it receives

Question 13

how does the control unit control the operation of the datapath?

Answer 13

it produces multiplexer select, register enable, and memory write signals

Question 14

what are heavy lines used to indicate?

Answer 14

32-bit data busses

Question 15

what are medium lines used to indicate?

Answer 15

narrower busses, such as 4 bit address busses on the register file

Question 16

what do narrow lines indicate?

Answer 16

1-bit buses

Question 17

what do blue lines represent?

Answer 17

control signals, such as the register file write enable

Question 18

what does the program counter(PC) do?

Answer 18

it outputs points to the current instruction

Question 19

what is PC’?

Answer 19

its the input for PC and it indicates the address of the next instruction

Question 20

how many read ports does the instruction memory have?

Answer 20

a single read port. It takes a 32-bit instruction address input A, and reads the 32-bit data from that address on the read data out, RD

Question 21

what registers does the 15-element x 32-bit register file hold?

Answer 21

R0-R14 and has an additional input to receive R15 from the PC.

Question 22

what are the Register file ports?

Answer 22

two read ports and one write port

Question 23

what kind of input do the read ports take?

Answer 23

4-bit address inputs

Question 24

how many ports does the data memory have?

Answer 24

a single read/ write port

Question 25

if the write enable is 0 what happens?

Answer 25

it reads address A onto RD

Question 26

the instruction memory, register file, and data memory are all?

Answer 26

read combinationally, meaning if the address changes, then the new data appears at RD after some propagation delay; no clock is involved

Question 27

a single-cycle microarchitecture executes an entire instruction in?

Answer 27

one cycle

Question 28

a multicycle microarchitecture executes an entire instruction in?

Answer 28

a series of shorter cycles

Question 29

pipeline microarchitecture applies a_____ to____?

Answer 29

pipeline, to the single-cycle microarchitecture. executing multiple processes at the same time