Technical data

Preparing the Board

http://www.mcg.mot.com/literature 1-11

IP DMA Snoop Jumper (J19)

J19 defines the state of the snoop control bus when an IP DMA controller

is local bus master. J19 pins 1 and 2 enable/disable the Snoop Control

signal on the MC68060 processor (pins 3-4 have no function on

MVME172LX boards).

For the MVME172LX, shorting pins 1-2 enables snooping. Leaving pins

1-2 disconnected (the factory configuration) inhibits snooping. With

snooping enabled, the snoop signal to the MC68060 processor is driven

low during IP DMA operations.

EPROM/Flash Configuration Header (J20)

The MVME172LX can be ordered with 2MB of Flash memory and two

EPROM sockets ready for the installation of EPROMs, which may be

ordered separately. The EPROM locations are standard JEDEC 32-pin DIP

sockets that support three jumper-selectable densities (256 Kbit x 8; 512

Kbit x 8 — the factory default; 1 Mbit x 8) and which in addition permit

disabling of the Flash memory.

J19

Snoop Inhibited (factory configuration)

J19

Snoop Enabled