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Refer to Chapter 4 for the pin assignments of the PMC connectors.
For detailed programming information, refer to the PCI bus
descriptions in the MVME2603/2604 Programmer's Reference Guide
and to the user documentation for the PMC modules you intend to
use.
VMEbus Interface
The VMEbus interface is implemented with the CA91C042
ÔÔUniverseÕÕ ASIC. The Universe chip interfaces the 32/64-bit PCI
local bus to the VMEbus.
The Universe ASIC provides:
The Universe chip includes Universe Control and Status Registers
(UCSRs) for interprocessor communications. It can provide the
VMEbus system controller functions as well. For detailed
programming information, refer to the Universe UserÕs Manual and
to the discussions in the MVME2603/2604 Programmer's Reference
Guide.
ISA Super I/O Device (ISASIO)
The MVME2603/2604 uses a PC87308 ISASIO chip from National
Semiconductor to implement certain segments of the P2 and front-
panel I/O:
The PCI-bus-to-VMEbus interface
The VMEbus-to-PCI-bus interface
The DMA controller functions of the local VMEbus
Two asynchronous serial ports (COM1 and COM2) via P2
and transition module
Parallel port via P2 and transition module:
Ð Centronics printer port in MVME712M-compatible
models
Functional Description
3-9
3
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