Motorola MVME172 - Manual (Page 58)

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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
Table 1-15 . 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
Table 1-16 , is
the configuration area. The sixth area, the TOD clock, detailed in Table
1-17 , 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