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Hardware Preparation and Installation
1
Flash Write Enable Mode (S5 Pin 4)
Segment 4 of switch S5 defines the Flash memory controller model (MC1
or MC2) to be emulated when enabling or disabling Flash memory
accesses on the MVME172P4 board. With S5 segment 4 set to
factory configuration), the board initializes in MC2 mode. With S5
segment 4 set to
In MC2 mode, writes to Flash memory are enabled or inhibited by a
control bit at memory location $FFF42042. With the control bit set to
Flash memory is write-enabled.
In MC1 mode, writes to Flash memory are enabled by a memory access to
any location in the range $FFFCC000-$FFFCFFF. Writes to Flash
memory are disabled by a memory access to any location in the range
$FFFC8000-$FFFCBFFF. For details, refer to the Programmer's
Reference Guide listed in "Related Documentation" in Appendix E.
1-20
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, the board initializes in MC1 mode.
OFF
S5
ON
OFF
MC2 Flash write enable mode
4
(factory configuration )
1
Computer Group Literature Center Web Site
(the
ON
2736 0004 (3-3)
,
1
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