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.