Motorola MPC533 Reference Manual page 864

Modes of Operation
example, from 0x3F FFE0 to 0x3F FFFF. The remainder (4 Kbytes – 32 bytes) is not only
available for normal array access but also contiguous with a 28-Kbyte non-overlay array.
L-Bus
CALRAM
Array
(4 Kbytes – 32 bytes) Available For Non-Overlay Use
U-bus Flash
CALRAM Normal Array Access
Figure 20-5. CALRAM Module Overlay Map of Flash (CLPS = 1)
Figure 22-10 shows the overlay regions when the CLPS bit is set for CALRAM in
MPC533.
The values programmed in the RBAx registers are unaffected by reset. See Section 20.5.2,
"CALRAM Region Base Address Registers (CRAM_RBAx)" for details. On reset, it is not
necessary to reprogram the RABx registers. In such cases, the calibration mode can be
re-entered simply by setting the OVL bit.
20.4.6.2 Priority of Overlay Regions
When the address matches to more than one enabled portion of the overlay region, the
effective region is the region with the highest priority. Priority is determined by the region
number; the highest priority assigned to the lowest region number.
20-8
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
Overlay 0
CALRAM Overlay Access
MPC533 Reference Manual
Non-Overlay Region
28 Kbytes
Overlay Region
4-Kbyte
Overlay 7
Overlay of 32 bytes
(each is 4 bytes long)
(Each overlay
is 4 bytes long and
must be 4-byte
aligned)
U-bus Flash
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