Motorola MPC533 Reference Manual page 415

Bits Name
7:9 — Reserved
10:12 AT Address type. This field can be used to specify that accesses involving the memory bank are
limited to a certain address space type. These bits are used in conjunction with the ATM bits in
the OR. The default value at reset is to map data only. For a full definition of address types,
refer to Section 9.5.8.6, "Address Types."
13:27 — Reserved
28:30 DMCS Dual-mapping chip select. This field determines which chip-select signal is assigned for dual
mapping.
000 CS[0]
001 CS[1]
010 CS[2]
011 CS[3]
1xx Reserved
31 DME Dual mapping enabled. This bit indicates that the contents of the dual-mapping registers and
associated base and option registers are valid and enables the dual-mapping operation. The
default value at reset comes from the internal data bus that reflects the reset configuration
word. See Section 10.5, "Dual Mapping of the Internal Flash EEPROM Array" for more
information.
0 Dual mapping is not active
1 Dual mapping is active
10.9.6 Dual-Mapping Option Register (DMOR)
,
MSB 1
0
Field —
HRESET
16 17
Field
HRESET
Addr
1
It is recommended that this field hold values that are the power of 2 minus 1 (e.g., 2
Figure 10-26. Dual-Mapping Option Register (DMOR)
MOTOROLA
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
Table 10-12. DMBR Bit Descriptions
2 3 4 5
1
AM
0000_0000_00
18 19 20 21
0000_0000_0000_0000
Chapter 10. Memory Controller
Description
6 7 8 9 10
—
22 23 24 25 26
—
0x2F C144
Programming Model
11 12 13 14
ATM —
001 000
27 28 29 30
3
- 1 = 7 [0b111]).
15
LSB
31
10-39