MPC8280 datasheet(569/1386 Pages) FREESCALE

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Communications Processor Module Overview

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

14-19

Figure 14-8. Internal Data RAM Memory Map

The internal data RAM data bus is 64-bits wide. The RAM is used for six possible tasks:

•

To store parameters associated with the FCCs, SCCs, SMCs, SPI, I2C, USB, and IDMAs in the

2,048-byte parameter RAM

•

To store the BDs that describe where data is to be received and transmitted from

•

To store data from the serial channels (optional because data can also be stored externally in the

system memory)

•

Temporary storage between FCC FIFO and external memory for FCC data that is moved by BTM

(from/to FCC FIFO) and SDMA (to/from external memory)

•

For additional RAM space for user software

0X0000

BD / DATA

0X1000

BD / DATA

0X1800

BD / DATA

0Xs00

BD / DATA

0X2800

BD / DATA

0X3000

BD / DATA

0X3800

Parameter RAM

0X4000

BD / DATA

0X8000

Parameter RAM

0X8800

BD / DATA

0X9000

BD / DATA

0X0800

Reserved

(Partly reserved

for future serials)

Bank #1

Bank #2

Bank #3

Bank #4

Bank #5

Bank #6

Bank #7

Bank #8

Bank #10

Bank #9

Bank #15

Bank #16

0XB000

0XB800

BD / DATA

Bank #11

0X9800

BD / DATA

Bank #12

0XA000

BD / DATA

Bank #13

0XA800

BD / DATA

Bank #14

0XC000

Reserved

MPC8280 Datasheet(PDF) 569 Page - Freescale Semiconductor, Inc

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