CALRAM Operation
MPC561/MPC563 Reference Manual, Rev. 1.2
Freescale Semiconductor
22-17
22.5.3
CALRAM Overlay Configuration Register (CRAM_OVLCR)
22.5.4
CALRAM Ownership Trace Register (CRAM_OTR)
This register is provided to support a separate module called READI. Refer to
The reads from this register will return 0’s.
NOTE
CRAM_OTR is also defined as READI_OTR. See
.”
MSB
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Field OVL DERR CLPS
—
SRESET
0000_0000_0000_0000
Addr
0x38 0028
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
LSB
31
Field
—
SRESET
0000_0000_0000_0000
Figure 22-11. CALRAM Overlay Configuration Register (CRAM_OVLCR)
Table 22-7. CRAMOVLCR Bit Descriptions
Bits
Name
Description
0
OVL
Overlay enable — When set, the CALRAM overlay mode operation is enabled. In this mode
CALRAM allows eight programmable sections (four to 512 bytes) of the on-chip U-bus Flash
memory module to be overlaid by sections of the CALRAM.
0 CALRAM module overlay is disabled
1 CALRAM module overlay is enabled
1
DERR
Data error
0 CALRAM module will not generate machine check exception due to normal L-bus array
access to the enabled portion overlay region even if overlay is enabled
1 CALRAM module will generate machine check exception due to normal L-bus array access to
the enabled portion of overlay region even if overlay is enabled
2
CLPS
Collapse the total overlay region from 4 Kbytes to 32 bytes; that is, the size is forced to be four
bytes for each for the eight regions regardless of the values programmed in CRAM_RBAx[0:3];
these bits are also referred to as RGN_SIZE[0:3].
0 Overlay region of four Kbytes; region size as specified by CRAM_RBAx[0:3].
1 Overlay region of 32 bytes; each region size is four bytes long regardless of the values in
CRAM_RBAx[0:3].
3:31
—
Reserved
Summary of Contents for MPC561
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