Motorola MVME172 User Manual download pdf (Page 23)

Block Diagrams

http://www.mcg.mot.com/literature 1-5

Block Diagrams

Figure 1-2 on page 1-7 is a general block diagram of the 200/300-Series

MVME172. Figure 1-2 on page 1-7 is a general block diagram of the

400/500-Series MVME172.

Functional Description

This section covers only a few specific features of the MVME172.

A complete functional description of the major blocks of the MVME172

Embedded Controller is provided in your MVME172 installation and use

manual.

No-VMEbus-Interface Option

The MVME172 can be operated as an embedded controller without the

VMEbus interface. For this option, the VMEchip2 and the VMEbus

buffers are not populated. Also, the bus grant daisy chain and the interrupt

acknowledge daisy chain have zero-ohm bypass resistors installed.

To support this feature, certain logic in the VMEchip2 has been duplicated

in the MC2 chip. Table 1-2 on page 1-8 defines the location of the

redundant logic. This logic is inhibited in the MC2 chip if the VMEchip2

is present. The enables for these functions are controlled by software and

MC2 chip hardware initialization.

Note that an MVME172 ordered without the VMEbus interface is shipped

with Flash memory blank (the factory uses the VMEbus to program the

Flash memory with debugger code). To use the 172Bug package,

MVME172Bug, in such models, be sure that the General Purpose

Readable Jumpers Header is configured for the EPROM memory map.

Refer to Chapters 3 and 4 of your MVME172 installation and use manual

for further details.

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Motorola MVME172 User Manual Page 23