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Fetch - Execute Cycle

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Slide 1: Video
Digital TechnologyFurther Education (Key Stage 5)

In deze les zitten 10 slides, met tekstslides en 1 video.

time-iconLesduur is: 15 min

Onderdelen in deze les

Slide 1 - Video

RAM Module 
16 memory locations
each containing 8 bits.

Some of these are instructions and some are variables.
Address
Data
0
0010 1110
1
0001  1111
2
1000 0100
3
0100 1101
4
0000 0000
5
0000 0000
6
0000 0000
7
0000 0000
8
0000 0000
9
0000 0000
10
0000 0000
11
0000 0000
12
0000 0000
13
0000 0000
14
0000 0011
15
0000 1110

Slide 2 - Tekstslide

6 Registers
4 Memory Data Registers

1 Memory Address Register (MAR)
aka Instruction Address Register

1 Current Instruction Register (CIR)
aka Instruction Register


Memory Data Register A
Memory Data Register B
Memory Data Register C
Register D
Memory Address Register 
Current Instruction Register

Slide 3 - Tekstslide

RAM Module 
16 memory locations
each containing 8 bits.

Some of these are instructions and some are variables.
Address
Data
0
0010 1110
1
0001  1111
2
1000 0100
3
0100 1101
4
0000 0000
5
0000 0000
6
0000 0000
7
0000 0000
8
0000 0000
9
0000 0000
10
0000 0000
11
0000 0000
12
0000 0000
13
0000 0000
14
0000 0011
15
0000 1110
Memory Data Register A
Memory Data Register B
Memory Data Register B
Memory Data Register B
Memory Address Register 
Current Instruction Register

Slide 4 - Tekstslide

Instruction Table
Instruction
Description
4-bit Opcode
Address or Registers
LOAD_A
Read RAM location into Register A
0010
4-bit RAM address
LOAD_B
Read RAM location into Register B
0001
4-bit RAM address
STORE_A
Write from Register A into RAM location
0100
4-bit RAM address
ADD
Add two Registers, store result into second Register
1000
2-bit Register ID,
2-Bit Register ID

Slide 5 - Tekstslide

RAM Module 
16 memory locations
each containing 8 bits.

Some of these are instructions and some are variables.
Address
Data
0
0010 1110
1
0001  1111
2
1000 0100
3
0100 1101
4
0000 0000
5
0000 0000
6
0000 0000
7
0000 0000
8
0000 0000
9
0000 0000
10
0000 0000
11
0000 0000
12
0000 0000
13
0000 0000
14
0000 0011
15
0000 1110
Memory Data Register A
0000 0000
Memory Data Register B
0000 0000
Memory Data Register B
0000 0000
Memory Data Register B
0000 0000
Memory Address Register 
0000 0000
Current Instruction Register
0000 0000

Slide 6 - Tekstslide

RAM Module 
16 memory locations
each containing 8 bits.

Some of these are instructions and some are variables.
Address
Data
0
0010 1110
1
0001  1111
2
1000 0100
3
0100 1101
4
0000 0000
5
0000 0000
6
0000 0000
7
0000 0000
8
0000 0000
9
0000 0000
10
0000 0000
11
0000 0000
12
0000 0000
13
0000 0000
14
0000 0011
15
0000 1110
Memory Data Register A
0000 0000
Memory Data Register B
0000 0000
Memory Data Register B
0000 0000
Memory Data Register B
0000 0000
Memory Address Register 
0000 0000
Current Instruction Register
0000 0000

Slide 7 - Tekstslide

RAM Module 
16 memory locations
each containing 8 bits.

Some of these are instructions and some are variables.
Address
Data
0
0010 1110
1
0001  1111
2
1000 0100
3
0100 1101
4
0000 0000
5
0000 0000
6
0000 0000
7
0000 0000
8
0000 0000
9
0000 0000
10
0000 0000
11
0000 0000
12
0000 0000
13
0000 0000
14
0000 0011
15
0000 1110
Memory Data Register A
0000 0000
Memory Data Register B
0000 0000
Memory Data Register B
0000 0000
Memory Data Register B
0000 0000
Memory Address Register 
0000 0000
Current Instruction Register
0010 1110

Slide 8 - Tekstslide

RAM Module 
16 memory locations
each containing 8 bits.

Some of these are instructions and some are variables.
Address
Data
0
0010 1110
1
0001  1111
2
1000 0100
3
0100 1101
4
0000 0000
5
0000 0000
6
0000 0000
7
0000 0000
8
0000 0000
9
0000 0000
10
0000 0000
11
0000 0000
12
0000 0000
13
0000 0000
14
0000 0011
15
0000 1110
Memory Data Register A
0000 0000
Memory Data Register B
0000 0000
Memory Data Register B
0000 0000
Memory Data Register B
0000 0000
Memory Address Register 
0000 0000
Current Instruction Register
0010 1110
OPCODE

Slide 9 - Tekstslide

Instruction Table
Instruction
Description
4-bit Opcode
Address or Registers
LOAD_A
Read RAM location into Register A
0010
4-bit RAM address
LOAD_B
Read RAM location into Register B
0001
4-bit RAM address
STORE_A
Write from Register A into RAM location
0100
4-bit RAM address
ADD
Add two Registers, store result into second Register
1000
2-bit Register ID,
2-Bit Register ID

Slide 10 - Tekstslide