Memory Controller
MPC561/MPC563 Reference Manual, Rev. 1.2
10-34
Freescale Semiconductor
10.9.4
Memory Controller Option Registers (OR0–OR3)
1,
30
BI
Burst inhibit
0 Memory controller drives BI negated (high). The bank supports burst accesses.
1 Memory controller drives BI asserted (low). The bank does not support burst accesses.
NOTE: Following a system reset, the BI bit is set.
31
V
Valid bit. When set, this bit indicates that the contents of the base-register and option-register
pair are valid. The CS signal does not assert until the V-bit is set.
NOTE: An access to a region that has no V-bit set may cause a bus monitor timeout. See
for the reset value of this bit in BR0.
Table 10-9. BR
x
[V] Reset Value
Branch Register
BR
x
[V] Reset Value
BR0
ID3
BR1
0
BR2
0
BR3
ID20 & ID31
MSB
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Field
AM
1
HRESET
0000_0000_0000_0000
Addr
0x2F C104 (OR0); 0x2F C10C (OR1); 0x2F C114 (OR2), 0x2F C11C (OR3)
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
LSB
31
AM
ATM
CSNT
ACS
EHTR
SCY
BSCY
TRLX
HRESET
0000_0000
1111
0
1
1
0
1
It is recommended that this field hold values that are the power of 2 minus 1 (e.g., 2
3
- 1 = 7 [0b111]).
Figure 10-24. Memory Controller Option Registers 1–3 (OR0–OR3)
Table 10-8. BR0–BR3 Bit Descriptions (continued)
Bits
Name
Description
Summary of Contents for MPC561
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