VLSI Multiple Choice Questions on “Design Styles”.
1. In which design all circuitry and all interconnections are designed?
A. full custom design
B. semi-custom design
C. gate array design
D. transistor design
Answer: A
Clarification: Full custom design is the complete design for the implementation. It contains all circuitry and all interconnections/communication paths.
2. Which design contains only the interconnections designed?
A. full custom design
B. semi-custom design
C. gate array design
D. transistor design
Answer: C
Clarification: Gate array design which is also known as uncommitted logic array design has the design of only the interconnections/communication paths.
3. In which method regularity is used to reduce complexity?
A. random approach
B. hierarchical approach
C. algorithmic approach
D. semi-design approach
Answer: B
Clarification: Hierarchical approach is in the one in which principles of iteration or regularity can be used to reduce the complexity of the design task.
4. Size of the die is determined using
A. transistor size
B. inverter size
C. area of the circuitry
D. length of the circuitry
Answer: C
Clarification: Size of the die is determined by the area occupied by the circuitry. Large die sizes area associated with poor yields and high costs.
5. Which design is faster?
A. full custom design
B. semi-custom design
C. gate array design
D. transistor design
Answer: C
Clarification: Gate array design is faster than a prototype full-custom design and the final custom designs must be carefully optimized.
6. Which has relatively low-level capabilities?
A. hand-crafted designs
B. computer assisted textual entry
C. computer assisted graphical entry
D. silicon compiler-based design
Answer: B
Clarification: Computer-assisted textual entry has programs which may be relatively low-level capabilities and it allows the entry of rectangular boxes, wires, etc.
7. Computer-assisted graphical entry is done through
A. monochrome
B. grayscale graphics
C. bichrome
D. trichrome
Answer: A
Clarification: Computer-assisted graphical entry of mask geometry is through either monochrome or color graphics terminal.
8. Which method is used for verification along with generation?
A. hand-crafted designs
B. computer assisted textual entry
C. computer assisted graphical entry
D. silicon compiler-based design
Answer: C
Clarification: Computer-assisted graphical entry method encourages regularity and are generally used with a generate then verify design philosophy.
9. Which method uses high level programming language?
A. hand-crafted designs
B. computer assisted textual entry
C. computer assisted graphical entry
D. silicon compiler-based design
Answer: D
Clarification: Silicon compiler-based design uses high level approach and uses special languages like high level language compilers.
10. The set of design rules does not give
A. widths
B. spacing
C. colors
D. overlaps
Answer: C
Clarification: Communication between the fabrication house and the designer takes the form of a set of design rules with gives clearance, widths, spacing, overlaps, etc.