I asked the question before and the answer I got does not makes sense.  My question is why did not we considered the Adder, Shift, ANd, Control when calculation delay time.? Again, it is in Risc-V.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
icon
Related questions
Topic Video
Question

I asked the question before and the answer I got does not makes sense.  My question is why did not we considered the Adder, Shift, ANd, Control when calculation delay time.? Again, it is in Risc-V.

 

lextbookK Solutions
Expert
Study Pack
Practice
4. The table shows the delays (pico second) of the components in Figure 4.17.
Read/write l-mem
Adder
And,
Control
Register
file
Mux
ALU
Sign
PC
D-mem
Shifter
extend
10
250
150
25
200
150
10
50
50
Calculate the delay of the 4 types of instructions. You need to show which components are used in each
instruction.
Instruction
Delay
add
Id
sd
beq
Transcribed Image Text:lextbookK Solutions Expert Study Pack Practice 4. The table shows the delays (pico second) of the components in Figure 4.17. Read/write l-mem Adder And, Control Register file Mux ALU Sign PC D-mem Shifter extend 10 250 150 25 200 150 10 50 50 Calculate the delay of the 4 types of instructions. You need to show which components are used in each instruction. Instruction Delay add Id sd beq
4.4 A Simple Implementation Scheme
257
Add
4
Add Sum
Shift
left 1
Branch
MemRead
MemtoReg
Instruction [6-0]
Control ALU0P
MemWrite
ALUSrc
RegWrite
Instruction [19-15]
Read
address
Read
register 1 Read
data 1
PC
Instruction [24-20]
Read
Zero
Instruction
register 2
[31-0]
ALU ALU
Read
Address data
Instruction [11-7]
Read
Write
register data 2
result
Instruction
memory
Write
data Registers
Data
Write
data memory
Instruction [31-0]
32
64
Imm
Gen
ALU
control
Instruction [30,14-12]
FIGURE 4.17 The simple datapath with the control unit. The input to the control unit is the 7-bit opcode field from the instruction.
The outputs of the control unit consist of two 1-bit signals that are used to control multiplexors (ALUSrc and MemtoReg), three signals for
controlling reads and writes in the register file and data memory (RegWrite, MemRead, and MemWrite), a 1-bit signal used in determining
whether to possibly branch (Branch), and a 2-bit control signal for the ALU (ALUOP). An AND gate is used to combine the branch control
signal and the Zero output from the ALU; the AND gate output controls the selection of the next PC. Notice that PCSrc is now a derived signal,
rather than one coming directly from the control unit. Thus, we drop the signal name in subsequent figures.
Transcribed Image Text:4.4 A Simple Implementation Scheme 257 Add 4 Add Sum Shift left 1 Branch MemRead MemtoReg Instruction [6-0] Control ALU0P MemWrite ALUSrc RegWrite Instruction [19-15] Read address Read register 1 Read data 1 PC Instruction [24-20] Read Zero Instruction register 2 [31-0] ALU ALU Read Address data Instruction [11-7] Read Write register data 2 result Instruction memory Write data Registers Data Write data memory Instruction [31-0] 32 64 Imm Gen ALU control Instruction [30,14-12] FIGURE 4.17 The simple datapath with the control unit. The input to the control unit is the 7-bit opcode field from the instruction. The outputs of the control unit consist of two 1-bit signals that are used to control multiplexors (ALUSrc and MemtoReg), three signals for controlling reads and writes in the register file and data memory (RegWrite, MemRead, and MemWrite), a 1-bit signal used in determining whether to possibly branch (Branch), and a 2-bit control signal for the ALU (ALUOP). An AND gate is used to combine the branch control signal and the Zero output from the ALU; the AND gate output controls the selection of the next PC. Notice that PCSrc is now a derived signal, rather than one coming directly from the control unit. Thus, we drop the signal name in subsequent figures.
Expert Solution
steps

Step by step

Solved in 2 steps

Blurred answer
Knowledge Booster
Instruction Format
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
Database System Concepts
Database System Concepts
Computer Science
ISBN:
9780078022159
Author:
Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:
McGraw-Hill Education
Starting Out with Python (4th Edition)
Starting Out with Python (4th Edition)
Computer Science
ISBN:
9780134444321
Author:
Tony Gaddis
Publisher:
PEARSON
Digital Fundamentals (11th Edition)
Digital Fundamentals (11th Edition)
Computer Science
ISBN:
9780132737968
Author:
Thomas L. Floyd
Publisher:
PEARSON
C How to Program (8th Edition)
C How to Program (8th Edition)
Computer Science
ISBN:
9780133976892
Author:
Paul J. Deitel, Harvey Deitel
Publisher:
PEARSON
Database Systems: Design, Implementation, & Manag…
Database Systems: Design, Implementation, & Manag…
Computer Science
ISBN:
9781337627900
Author:
Carlos Coronel, Steven Morris
Publisher:
Cengage Learning
Programmable Logic Controllers
Programmable Logic Controllers
Computer Science
ISBN:
9780073373843
Author:
Frank D. Petruzella
Publisher:
McGraw-Hill Education