IGCSE Computer Science Paper 1 Crossword: 3.1 Computer Architecture (Modules 228–239)
Name:
Date:
Class:
✎
Crossword
Read each clue and write the matching term in the grid. Numbers in brackets show the letters in each word.
1
2
3
4
5
6
7
8
9
Across
- 2. The CPU repeats three stages for every instruction: ______ it from RAM, ______ what it means, then ______ it. The ______ then starts again with the next instruction. Word 1 of: _____-______-_______ _____ (5)
- 4. End of fetch: the PC is increased by 1 so it points to the next instruction, and the instruction held in the MDR is copied to the ______, ready to be decoded. Word 4 of: PC ← PC + 1; ___ ← MDR (3)
- 5. Word 1 of the term in 1 Down: ___ ___________ (3)
- 7. Recording the contents of the PC, MAR, MDR, CIR and ACC, and the bus used, at each step as one instruction goes through the fetch-decode-execute cycle. Word 2 of: register _____ (5)
- 8. Word 4 of the term in 2 Across: _____-______-_______ _____ (5)
- 9. Word 2 of the term in 2 Across: _____-______-_______ _____ (6)
Down
- 1. How fast a ______ runs programs. More cores, a bigger cache or a faster clock speed can raise it, but each has limits: software must split tasks, cache is costly, and a faster clock makes more heat. Word 2 of: ___ ___________ (11)
- 3. Word 3 of the term in 2 Across: _____-______-_______ _____ (7)
- 5. A small amount of very fast memory in or near the CPU that stores frequently used instructions and data, so the CPU can get them faster than from RAM. (5)
- 6. The list of all the commands (such as load, add, store and jump) that a CPU design can process. The control unit decodes each instruction using it. Word 2 of: instruction ___ (3)
Answer Key
IGCSE Computer Science Paper 1 · Modules 228–239
1P
2F
E
T
C
H
3E
R
X
F
E
O
4C
I
R
5C
P
U
M
6S
A
7T
R
A
C
E
8C
Y
C
L
E
N
T
H
C
9D
E
C
O
D
E
Across
2FETCH — The CPU repeats three stages for every instruction: ______ it from RAM, ______ what it means, then ______ it. The ______ then starts again with the next instruction. Word 1 of: _____-______-_______ _____
4CIR — End of fetch: the PC is increased by 1 so it points to the next instruction, and the instruction held in the MDR is copied to the ______, ready to be decoded. Word 4 of: PC ← PC + 1; ___ ← MDR
5CPU — Word 1 of the term in 1 Down: ___ ___________
7TRACE — Recording the contents of the PC, MAR, MDR, CIR and ACC, and the bus used, at each step as one instruction goes through the fetch-decode-execute cycle. Word 2 of: register _____
8CYCLE — Word 4 of the term in 2 Across: _____-______-_______ _____
9DECODE — Word 2 of the term in 2 Across: _____-______-_______ _____
Down
1PERFORMANCE — How fast a ______ runs programs. More cores, a bigger cache or a faster clock speed can raise it, but each has limits: software must split tasks, cache is costly, and a faster clock makes more heat. Word 2 of: ___ ___________
3EXECUTE — Word 3 of the term in 2 Across: _____-______-_______ _____
5CACHE — A small amount of very fast memory in or near the CPU that stores frequently used instructions and data, so the CPU can get them faster than from RAM.
6SET — The list of all the commands (such as load, add, store and jump) that a CPU design can process. The control unit decodes each instruction using it. Word 2 of: instruction ___