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Block Diagram
VMEbus Interface
3
ISA Super I/O Device (ISASIO)
Asynchronous Serial Ports
3-10
The VMEchip2 ASIC, in tandem with the VME2PCI ASIC, constitutes the
VMEbus interface. The VMEchip2 interfaces an MC68040-style local bus
to the VMEbus. The VME2PCI interfaces the PCI bus to an MC68040-
style local bus. When the VMEchip2 and the VME2PCI chips are used
together, they form a PCI-bus-to-VMEbus interface.
The VMEchip2/VME2PCI combination provides:
The local-bus-to-VMEbus interface
The VMEbus-to-local-bus interface
The DMA controller functions of the local VMEbus
The VMEchip2 includes Global Control and Status Registers (GCSRs) for
interprocessor communications. It can provide the VMEbus system
controller functions as well. For detailed programming information, refer
to the VMEchip2 and VME2PCI discussions in the
MVME1603/MVME1604 Programmer's Reference Guide.
The MVME1603/MVME1604 uses a PC87303 ISASIO chip from
National Semiconductor to implement certain segments of the P2 and
front-panel I/O:
Two asynchronous serial ports (COM1 and COM2) via P2 and
transition module
IEEE1284 bidirectional parallel port via P2 and transition module
Disk drive support via drive connector J6 and power connector J16
(on the MVME1600-001) or J19 (on the MVME1600-011)
Keyboard and mouse interface (MVME1600-001 base board only)
The two asynchronous ports provided by the ISASIO device employ TTL-
level signals that are routed to the P2 connector. The TTL output lines are
buffered through TTL drivers and series resistors. The EIA-232-D drivers
and receivers that complete the serial interface are located on the
MVME760 (for the MVME1600-001 base board) or MVME712M (for the
MVME1600-011 base board) transition module.
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Troubleshooting
