CDR3 Flash (UC3F) EEPROM
MPC561/MPC563 Reference Manual, Rev. 1.2
21-10
Freescale Semiconductor
4:5
SBDATA
Small block data space. Each small array block of the UC3F EEPROM may be mapped into data
or both data and instruction address space. When a small array block is mapped into data
address space, SBDATA[M] = 1, only data accesses will be allowed. When a small array block
is mapped into both data and instruction address space, SBDATA[M] = 0, both data and
instruction accesses will be allowed.
If SBEN[M] = 0, the corresponding small block M is logically part of the host block and
SBDATA[M] has no effect. Instead, the corresponding DATA[M] bit will be used to determine if
the small block is mapped to Data or to both Data and Instruction address space.
Like the DATA bits, the SBDATA bits are not actually used in the UC3F EEPROM module but are
used by the BIU to determine access restrictions to the UC3F array. Block addresses are
decoded in the BIU to determine which small array block is selected, and the selected small
block’s SBDATA bit is compared with the address space attributes to determine validity of an
array access.
0 small block M is placed in both Data and Instruction address spaces
1 small block M is placed in Data address space
6:7
SBPROTEC
T
Small block protect. Each small block of the UC3F EEPROM can be individually protected from
program or erase operation. The UC3F will perform all program and erase interlocks and even
complete the program or erase sequence, but the program and erase voltages are not applied
to locations within the protected small block(s).
0 small block M is unprotected
1 small block M is protected
8:9
—
Reserved
10:15
BIU
BIU configuration bits. These register bits are reserved for BIU functionality and are strictly
outputs from the UC3F EEPROM.
16:18
MEMSIZ
Memory size. The MEMSIZ field is used to indicate the UC3F array size. The MEMSIZ bits are
read only and writes have no effect.
000
UC3F array is 64 Kbytes
001
UC3F array is 128 Kbytes
010
UC3F array is 192 Kbytes
011
UC3F array is 256 Kbytes
100
unused
101
UC3F array is 512 Kbytes
110
unused
111
unused
The Flash module on the MPC563 is 512 Kbytes.
19
BLK
Block size. The BLK bit is used to indicate the array block size used in the UC3F array. The BLK
bit is read only and writes have no effect.
0 array block size is 32 Kbytes
1 block size is 64 Kbytes NOTE: All blocks are 64 Kbytes (i.e. BLK is always set)
20
MAP
Array address mapping. The MAP bit is used to indicate the UC3F array address mapping within
a 2
N
address space. The MAP bit is read only and writes have no effect. The MAP bit is more
useful when the UC3F array is a non-2
N
size.
When MAP = 0, the UC3F array is mapped to the bottom (starting at address 0) of the 2
N
space
in which the array resides. For modules with 2
N
array sizes, the MAP bit is always set to 0.
When MAP = 1, the UC3F array is mapped to the top (ending at address all $F’s) of the 2
N
space
in which the array resides.
0 UC3F array is mapped to bottom of 2
N
address space
1 UC3F array is mapped to top of 2
N
address space
Table 21-4. UC3FMCRE Bit Descriptions (continued)
Bits
Name
Description
Summary of Contents for MPC561
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