Emerson MVME7100, Installation And Use Manual

Page: 38 / 138

Hardware Preparation and Installation
MVME7100 Single Board Computer Installation and Use (6806800E08C )
38
2.4.1.6 PMC 133 MHz
The PMC 133 MHz switch is OFF for normal operation. When the switch is ON, the maximum
frequency of operation for the PMC sites is 133 MHz. 133 MHz operation should not be enabled
unless the PMC modules are designed to support 133 MHz operation. When the switch is OFF,
the maximum frequency is 100 MHz.
2.4.1.7 Master WP
The Master Write Protect (WP) switch is OFF for normal operation. When this switch is ON,
writes to the NOR Flash, NAND Flash, MRAM and I
2
C EEPROMs are disabled. When the switch
is OFF, writes to the non-volatile devices may be allowed depending on other switches and
control bits.
2.4.2 Geographical Address Switch, S2
The Tsi148 VMEbus Status Register provides the VMEbus geographical address of the
MVME7100. Applications not using the 5-row backplane can use the geographical address
switch to assign a geographical address per the following diagram. More information
regarding GA address switch assignments can be found in the
MVME7100 Single Board
Computer Programmer’s Reference .
Figure 2-5 Geographical Address Switch Position