Register Descriptions; Base Registers - Motorola MPC823e Reference Manual

15.3.1 Register Descriptions

15.3.1.1 BASE REGISTERS. The base registers (BR0-7) contain the base address and
address types that are used by the memory controller to compare the address bus with the
current address accessed. It also includes a memory attribute and selects the machine for
memory operation handling. After reset, BR0 is referred to as the Boot BR0 and it has a
special functionality until the first write to OR0.
BOOT BR0
BIT 0 1 2
FIELD
RESET
R/W
ADDR
BIT 16 17 18
FIELD
BA AT
RESET
0 0
R/W
R/W R/W
ADDR
*
This value depends on the value of the hard reset configuration word.
BR x
BIT 0 1 2
FIELD
RESET
R/W
ADDR
(IMMR & 0xFFFF0000) + 0x100 (BR0), 0x108 (BR1), 0x110, (BR2), 0x118 (BR3), 0x120 (BR4), 0x128 (BR5), 0x130 (BR6), 0x138 (BR7)
BIT 16 17 18
FIELD
BA AT
RESET
0 0
R/W
R/W R/W
ADDR
(IMMR & 0xFFFF0000) + 0x102 (BR0), 0x10A (BR1), 0x112, (BR2), 0x11A (BR3), 0x122 (BR4), 0x12A (BR5), 0x132 (BR6), 0x13A (BR7)
MOTOROLA
3 4 5 6 7
(IMMR & 0xFFFF0000) + 0x100
19 20 21 22 23
PS PARE WP
*
0 0
R/W R/W R/W
(IMMR & 0xFFFF0000) + 0x102
3 4 5 6 7
19 20 21 22 23
PS PARE WP
0 0 0
R/W R/W R/W
MPC823e REFERENCE MANUAL
8 9 10 11
BA
0
R/W
24 25 26 27
MS RESERVED
0
R/W
8 9 10 11
BA
0
R/W
24 25 26 27
MS RESERVED
0
R/W
Memory Controller
12 13 14 15
28 29 30 31
V
*
0
R/W R/W
12 13 14 15
28 29 30 31
V
0 0
R/W R/W
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