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ROM/Flash Interface Operation
MPC8240
Output
Signals
0–8
32-bit Mode
SDMA
SDBA
PAR
SDMA
Logical
Names
AR
Figure 6-53. ROM/Flash Address Multiplexing—32-Bit Mode
Address multiplexing for the 64-bit mode occurs according to the interface configuration
settings as shown in Figure 6-54.
.
MPC8240
Output
Signals
0–8
64-bit Mode
SDMA
SDBA
PAR
Logical
Names
AR
Figure 6-54. ROM/Flash Address Multiplexing—64-Bit Mode
6.4.2 64 or 32-Bit ROM/Flash Interface Timing
The MPC8240 provides 20 address bits with which to access 8 Mbytes of external 64-bit
ROM and 21 address bits with which to access 8 Mbytes of external 32-bit ROM. In
addition, two ROM chip selects (RCS0, RCS1) allow addressing of ROM memories of up
to 16 Mbytes.
6-78
1
1
1
1
1
1
9
0
1
2
3
4
5
0 1 2 3 4 5 6 7
1
2
2
1
1
1
1
1
1
0
9
8
7
6
5
4
1
1
1
1
1
1
9
0
1
2
3
4
5
0 1 2 3 4 5 6 7
1
1
1
1
1
1
1
9
8
7
6
5
4
3
MPC8240 Integrated Processor User's Manual
Physical Address
1
1
1
1
2
2
2
6
7
8
9
0
1
2
1
9 8 7 6 5 4 3 2 1 0
0
0
1
1
1
1
9 8 7 6 5 4 3 2 1 0
3
2
1
0
Physical Address
1
1
1
1
2
2
2
6
7
8
9
0
1
2
1
9 8 7 6 5 4 3 2 1 0
0
0
1
1
1
9 8 7 6 5 4 3 2 1 0
2
1
0
2
2
2
2
2
2
2
3
3
4
5
6
7
8
9
0
2
2
2
2
2
2
2
3
3
4
5
6
7
8
9
0
3
1
3
1
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