Dual-port ram memory map -16 – Motorola MPC8260 User Manual
Page 446
13-16
MPC8260 PowerQUICC II UserÕs Manual
MOTOROLA
Part IV. Communications Processor Module
Figure 13-8. Dual-Port RAM Memory Map
The dual-port RAM data bus is 64-bits wide. The RAM is used for six possible tasks:
¥
To store parameters associated with the FCCs, SCCs, MCCs, SMCs, SPI, I
2
C, and
IDMAs in the parameter RAM.
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To store buffer descriptors (BDs).
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To hold data buffers (optional because data can also be stored in external memory).
¥
For temporary storage of FCC data moving to/from an FCC FIFO (using the BTM)
from/to external memory (using SDMA).
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To store RAM microcode for the CP. This feature allows Motorola to add protocols
in the future.
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For additional scratch-pad RAM space for user software.
The RAM is designed to serve multiple requests at the same cycle, as long as they are not
in the same bank.
BD/Data/µCode
2 KBytes
Bank #1
0x0000
BD/Data/µCode
2 KBytes
Bank #2
0x0800
BD/Data/µCode
2 KBytes
Bank #3
0x1000
BD/Data/µCode
2 KBytes
Bank #4
0x1800
BD/Data/µCode
2 KBytes
Bank #5
0x2000
BD/Data/µCode
2 KBytes
Bank #6
0x2800
BD/Data
2 KBytes
Bank #7
0x3000
BD/Data
2 KBytes
Bank #8
0x3800
BD/Data/µCode
2 KBytes
Bank #1
0x4000
BD/Data/µCode
2 KBytes
Bank #1
BD/Data/µCode
2 KBytes
Bank #1
BD/Data/µCode
2 KBytes
Bank #1
BD/Data/µCode
2 KBytes
Bank #1
BD/Data/µCode
2 KBytes
Bank #1
BD/Data/µCode
2 KBytes
Bank #1
BD/Data/µCode
2 KBytes
Bank #1
Parameter RAM
2 KBytes
Bank #9
0x8000
Parameter RAM
2 KBytes
Bank #10
0x8800
BD/Data/µCode
2 KBytes
Bank #11
0x9000
BD/Data/µCode
2 KBytes
Bank #1
BD/Data/µCode
2 KBytes
Bank #1
BD/Data/µCode
2 KBytes
Bank #1
FCC Data
2 KBytes
Bank #11
0xB000
FCC Data
2 KBytes
Bank #12
0xB800
Reserved
Reserved
(Partially Reserved)