Port X Interface - Motorola MPC8240 User Manual

ROM/Flash Interface Operation
Figure 6-63. (Continued) PCI Reads from ROM/Port X 8-Bit (Part 4 of 4)

6.4.7 Port X Interface

The MPC8240's memory interface is flexible enough to allow the system designer to
connect other non-memory devices to it. This functionality is typically called Port X. By
sharing the ROM/Flash interface capabilities with general purpose I/O devices it is possible
to configure a wide range of devices with the MPC8240. Note that the Port X interface
shares the MPC8240 ROM/Flash state machine and so the timing configurations used for
ROM/Flash also apply to Port X (that is, a system cannot set up different timings for
ROM/Flash and Port X). Figure 6-64 shows a block diagram of the Port X Peripheral
Interface.
Chapter 6. MPC8240 Memory Interface 6-89