Motorola MVME2400 - Manual (Page 74)

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Functional Description
3
For detailed programming information, refer to the MVME2400-Series
VME Processor Module Programmer’s Reference Guide and to Texas
Instrument’s data sheet #SLLS057D, dated August 1989, revised March
1996 for Asynchronous Communications Element (ACE) TL16C550A.
PCI-ISA Bridge (PIB) Controller
The MVME240x uses a Winbond W83C553 PCI/ISA Bridge (PIB)
Controller to supply the interface between the PCI local bus and the ISA
system I/O bus (diagrammed in Figure 3-1).
The PIB controller provides the following functions:
❏ PCI bus arbitration for:
– ISA (Industry Standard Architecture) bus DMA (not functional
on MVME240x)
– The PHB (PCI Host Bridge) MPU/local bus interface function,
implemented by the Hawk ASIC
– All on-board PCI devices
– The PMC slot
❏ 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
Accesses to the configuration space for the PIB controller are performed
by way of the CONADD and CONDAT (Configuration Address and Data)
registers in the PHB. The registers are located at offsets $CF8 and $CFC,
respectively, from the PCI I/O base address.