MPC8280 datasheet(105/1386 Pages) FREESCALE

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Overview

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

1-11

1.6

MPC8280 Configurations

The MPC8280 offers flexibility in configuring the device for specific applications. The functions

mentioned in the above sections are all available in the device, but not all of them can be used at the same

time. This does not imply that the device is not fully activated in any given implementation: The CPM

architecture has the advantage of using common hardware resources for many different protocols, and

applications. Two physical factors limit the functionality in any given system—pinout and performance.

1.6.1

Pin Configurations

Some pins have multiple functions. Choosing one function may preclude the use of another. Information

about multiplexing constraints can be found in Chapter 16, “CPM Multiplexing,” and Chapter 41,

“Parallel I/O Ports.”

1.6.2

Serial Performance

Serial performance depends on a number of factors:

•

Serial rate versus CPM clock frequency for adequate sampling on serial channels

•

Serial rate and protocol versus CPM clock frequency for CP protocol handling

•

Serial rate and protocol versus bus bandwidth

•

Serial rate and protocol versus system core clock for adequate protocol handling

The second item above is addressed in this section—the CP’s ability to handle high bit-rate protocols in

parallel. Slow bit-rate protocols do not significantly affect those numbers.

Table 1-2 describes a few options to configure the fast communications channels on the MPC8280. The

frequency specified is the minimum CPM frequency necessary to run the mentioned protocols

concurrently at full-duplex.

Table 1-2. Serial Performance1

1 For the MPC8270 see Table 1-3.

FCC1

FCC2

FCC3

MCC

CPM Clock

(MHz)

60x Bus Clock

(MHz)

155-Mbps ATM

100 BaseT

133

100 BaseT

133

155-Mbps ATM

128 * 64 Kbps channels

133

100 BaseT

128 * 64 Kbps channels

133

155-Mbps ATM

256 * 64 Kbps channels

166

100 BaseT

256 * 64 Kbps channels

133

45-Mbps HDLC

256 * 64 Kbps

133

45-Mbps HDLC

100 BaseT

256 * 64 Kbps

166

100 BaseT

16 * 576 Kbps

166

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