The PCI BUS allows us to connect _______ I/O devices.

The PCI BUS allows us to connect _______ I/O devices.

Right Answer is:

9

SOLUTION

  • The PCI BUS allows us to connect 21 I/O devices.
  • A device can be selected for a configuration operation by issuing a configuration command and an address in which the corresponding AD line is set to 1 and the remaining 20 lines set to 0.
  • The lower address lines, AD10 to ADOO, are used to specify the type of operation and to access the contents of the device configuration ROM.
  • This arrangement limits the number of I/O devices to 21.
  • The PCI BUS allows only 21 devices to be connected as only the higher order 21 bits of the 32-bit address space is used to specify the device.
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