MPC8280 datasheet(1194/1386 Pages) FREESCALE

1194 / 1386 page

Inverse Multiplexing for ATM (IMA)

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

34-48

Freescale Semiconductor

34.4.8.2.2

Programming the FCC Parameter Shadow

All of the user-defined or user-initialized FCC parameters of the FCC should be copied from the FCC

parameter page to the shadow page. The following parameters are exceptions:

•

RCELL_TMP_BASE of the shadow page must differ from RCELL_TMP_BASE of the FCC

parameter page. This RCELL_TMP_BASE must point to a separate temporary cell storage area

similar to that reserved on the FCC parameter page.

•

Either:

— (1) INTT_BASE of the shadow page must differ from the INTT_BASE of the FCC parameter

page, and along with it separate interrupt parameters and queues.

— OR (2) INTT_BASE of the shadow page and FCC parameter page may be the same and

therefore share common structures, but (a) receive interrupts for the data channels associated

with non-IMA links, data channels associated with non-IDCR IMA links, and ICP channels for

group-unassigned IMA links must be directed to one dedicated interrupt queue, and (b) receive

interrupts for the data channels of group-assigned IMA links using IDCR must be directed to

another dedicated interrupt queue.

•

COMM_INFO on the shadow page is unused. ATM commands issued will use the COMM_INFO

fields on the FCC parameter page.

•

INT_RCT_BASE and EXT_RCT_BASE should be the same for both the shadow page and the

FCC parameter page. However, (a) received data from data channels associated with non-IMA

links, received data from data channels associated with non-IDCR IMA links, and received ICP

cells from group-unassigned IMA links, and (b) received data and ICP cells from group-assigned

IMA links using IDCR must never target the same receive queues. This would not normally be

done anyway; however, if it was done, it would result in erratic operation.

34.4.8.2.3

On-the-Fly Changes of FCC Parameters

In general, the FCC parameters should not require changes when the FCC is operating. In the event that

on-the-fly changes of FCC parameters is performed, those changes should be made one-by-one first in the

parameters of the shadow area, followed by the same change in the FCC parameter area.

Table 34-24. Unavailable Features when DREQ

x used as IDCR Master Clock

IDCR Master Clock DPRAM Page

MPC8280 Features Not Available

DREQ1

MCC1, SMC1, and IDMA1 are unavailable.

DREQ2

MCC2, SMC2, and IDMA2

DREQ3

SPI and IDMA3

DREQ4

RISC Timers, Microcode Rev Num, Random Number Generator

function and IDMA4

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