21. Which of the following processors also can work as a digital signal processor?
A. 8086
B. 8088
C. 8080
D. ARM9E
Answer: D
ARM9E can also have a DSP level of performance without having a digital signal processor by its enhanced DSP instructions.
22. What types of modules are used in the digital signal processor to form the loop structure?
A. modulo-timer
B. modulo-counter
C. timer
D. external timer
Answer: B
By using hardware multipliers, counters, etc the entire hardware can be redesigned to perform some specific functions which are used in digital signal processors. One such is the modulo-counter to form the loop structure.
23. Name a processor which is used in digital audio appliances.
A. 8086
B. Motorola DSP56000
C. 80486
D. 8087
Answer: B
Motorola DSP56000 is a powerful digital signal processor which is used in digital audio applications which have the capability of noise reduction and multi-band graphics whereas 8087 is a coprocessor and 80486 and 8086 are microprocessors.
24. How many bits does the DSP56000 processor have?
A. 8
B. 16
C. 24
D. 32
Answer: C
In order to increase the resolution, DSP56000 is a 24-bit data word processor.
25. How many buses did DSP56000 possess?
A. 2
B. 3
C. 4
D. 5
Answer: B
It possesses three separate external buses, one is for the program and the remaining two buses are for X and Y memories for data.
26. Which of the following architecture does DSP56000 possess?
A. Harvard
B. von Neumann
C. CISC
D. program-stored
Answer: A
DSP56000 possesses Harvard architecture since this architecture has a separate bus for program memory and data memory.
27. What does AAU stand for?
A. arithmetic address unit
B. address arithmetic unit
C. address access unit
D. arithmetic access unit
Answer: B
DSP56000 possesses two external bus switches which one is for data and the other is for the address for communicating with the outside world and these two switches are reproduced by the internal data bus and AAU.
28. How many address registers does the AAU of a DSP56000 have?
A. 8
B. 16
C. 24
D. 32
Answer: C
AAU has 24 address registers in three banks of eight.
29. How many registers does a DSP56000 have?
A. 4
B. 5
C. 7
D. 6
Answer: C
DSP56000 has six 24-bit registers for controlling the loop counts, operating mode, stack manipulation, and condition codes.
30. Which of the following bits are used for sign extension in DSP56000?
A. upper 8 bits of the stack pointer
B. lower 8 bits of the stack pointer
C. lower 8 bits of the program counter
D. upper 8 bits of the program counter
Answer: D
The DSP56000 has a 24-bit program counter in which the upper 8 bits are only used for sign extension.
