PCI/ISA Bridge Controller
http://www.motorola.com/computer/literature 5-19
5
socket (J21/J22) accommodates ISA modules. PC/104-Plus (PCI/ISA)
modules can be intermingled with PC/104 (ISA) modules and stacked up
to four high; three can be masters.
Refer to PC/104 (ISA) Expansion Connector J21/J22 on page 6-25 for the
pin assignments of the PC/104 and PC/104-Plus connectors. For
programming information, refer to the PCI and ISA bus descriptions in the
MBX Series Embedded Controller Version B Programmer’s Reference
Guide and to the user documentation for the modules you intend to use.
PCI/ISA Bridge Controller
The MBX series embedded controller uses a Winbond W83C553F bridge
controller to supply the interface between the PCI local bus and the ISA
system I/O bus (diagrammed in Figure on page 5-4). In addition, the
PCI/ISA bridge controller provides support circuitry for standard-
configuration boards and incorporates an EIDE interface for hard disk
drives. The PCI/ISA bridge controller provides the following functions:
❏ PCI bus arbitration for:
– The PHB (Processor Host Bridge) MPU/local bus interface
– The PC/104-Plus interface
– The integrated PCI/EIDE interface
❏ ISA bus arbitration for DMA devices
❏ ISA interrupt mapping for four PCI interrupts
❏ Interrupt controller functionality to support 14 ISA interrupts
❏ Edge/level control for ISA interrupts
❏ Seven independently programmable DMA channels
❏ One 16-bit timer
❏ Three interval counters/timers
The EIDE (Enhanced Integrated Drive Electronics) interface with bus
master capability supports a direct ribbon cable connection to 2.5-inch
hard disk drives via a header (J14) on the MBX board. J14 is a standard 44-
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