Question

Which of the following can be used as a chip select?

(a) multifunction I/O port

(b) parallel port

(c) DMA port

(d) memory port

This question was posed to me during an interview.

The query is from Parallel Ports topic in portion Basic Peripherals of Embedded Systems

Answer 1

Right option is (a) multifunction I/O port

To elaborate: The multifunction I/O port can also be used a chip select for the memory design. The function that the pin performs is set up internally through the use of a function register which internally configures how the external pins are connected internally.