CALRAM Operation
MPC561/MPC563 Reference Manual, Rev. 1.2
Freescale Semiconductor
22-11
Figure 22-8. CALRAM Address Map (CLPS = 1)
The values programmed in the RBAx registers are unaffected by reset. See
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.
22.4.6.2
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.
The benefit from this priority feature is that by storing the parameters in eight overlay regions, it overlays
all eight regions onto the same 512-byte Flash region, and enables the overlay feature. Upon observing
system performance with a set of parameters, the next set of parameters can be selected by simply
disabling the highest priority region. This “observing and disabling the highest priority region” loop can
continue until all regions are disabled. This allows moving from one set of parameters to another with
0x3F FFFF
0x3F 8000
CALRAM
0x3F F000
(28-Kbyte
32-Kbyte
CALRAM
Non-Overlay Area)
32-byte Overlay Area
(0x3F FFE0 — 0x3F FFFF)
4 Kbytes
—
32 bytes
Available for Non-
Overlay Use
Summary of Contents for MPC561
Page 84: ...MPC561 MPC563 Reference Manual Rev 1 2 lxxxiv Freescale Semiconductor...
Page 144: ...Signal Descriptions MPC561 MPC563 Reference Manual Rev 1 2 2 46 Freescale Semiconductor...
Page 206: ...Central Processing Unit MPC561 MPC563 Reference Manual Rev 1 2 3 62 Freescale Semiconductor...
Page 302: ...Reset MPC561 MPC563 Reference Manual Rev 1 2 7 14 Freescale Semiconductor...
Page 854: ...Time Processor Unit 3 MPC561 MPC563 Reference Manual Rev 1 2 19 24 Freescale Semiconductor...
Page 968: ...Development Support MPC561 MPC563 Reference Manual Rev 1 2 23 54 Freescale Semiconductor...
Page 1144: ...Internal Memory Map MPC561 MPC563 Reference Manual Rev 1 2 B 34 Freescale Semiconductor...
Page 1212: ...TPU3 ROM Functions MPC561 MPC563 Reference Manual Rev 1 2 D 60 Freescale Semiconductor...
Page 1216: ...Memory Access Timing MPC561 MPC563 Reference Manual Rev 1 2 E 4 Freescale Semiconductor...