Nov2017 cs Q5
0. Which of the following is correct statement ?
- A
In memory - mapped I/O, the CPU can manipulate I/O data residing in interface registers that are not used to manipulate memory words.
- B
The isolated I/O method isolates memory and I/O addresses so that memory address range is not affected by interface address assignment.
- C
In asynchronous serial transfer of data the two units share a common clock.
- D
In synchronous serial transmission of data the two units have different clocks.
- Option : B
- Explanation :
- The isolated I/O method isolates memory and I/O addresses so that memory address range is not affected by interface address assignment.
- Memory based I/O uses same address space for memory and I/O devices.
- In asynchronous serial transfer of data the two units do not share a common clock.
- In synchronous serial transfer of data the two units share a common clock.
Refer:I/O interface Option (B) is correct.
