Motorola MVME172 ユーザーズマニュアル
1-40
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Board Description and Memory Maps
1
BBRAM/TOD Clock Memory Map
The MK48T58 BBRAM (also called Non-Volatile RAM or NVRAM) is
divided into six areas as shown in
divided into six areas as shown in
. The first five areas are
defined by software, while the sixth area, the time-of-day (TOD) clock, is
defined by the chip hardware. The first area is reserved for user data. The
second area is used by Motorola networking software. The third area may
be used by an operating system. The fourth area is used by the MVME172
board debugger (MVME172Bug). The fifth area, detailed in
defined by the chip hardware. The first area is reserved for user data. The
second area is used by Motorola networking software. The third area may
be used by an operating system. The fourth area is used by the MVME172
board debugger (MVME172Bug). The fifth area, detailed in
, is
, is defined by the chip hardware.
Table 1-15. MK48T58 BBRAM/TOD Clock Memory Map
Address Range
Description
Size (Bytes)
$FFFC0000 - $FFFC0FFF
User Area
4096
$FFFC1000 - $FFFC10FF
Networking Area
256
$FFFC1100 - $FFFC16F7
Operating System Area
1528
$FFFC16F8 - $FFFC1EF7
Debugger Area
2048
$FFFC1EF8 - $FFFC1FF7
Configuration Area
256
$FFFC1FF8 - $FFFC1FFF
TOD Clock
8