MPC8280 datasheet(1200/1386 Pages) FREESCALE

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Inverse Multiplexing for ATM (IMA)

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

34-54

Freescale Semiconductor

Figure 34-32. IMA Microcode/Software Interaction

34.5.2

Initialization Procedure

1. Program FCC registers/parameters for ATM operation with UTOPIA multi-PHY (excluding APC

parameters for IMA PHYs).

2. Program IMA FCC and root parameters.

3. Enable FCC via GFMRx[ENR,ENT].

Aside from IMA state machine control and IMA-specific error events, subsequent interaction with the

ATM channels is the same as for non-IMA operation (e.g. host commands, RCT/TCT parameters, buffer

descriptors, interrupts).

34.5.3

Software Responsibilities

The following functions are the responsibility of the host software which must complement the IMA

microcode in order to provide a complete IMA solution.

34.5.3.1

System Definition

•

Definition of P(Rx) and P(Tx)—software variables which are used to determine “sufficient links”

IMA Rx

Tx ICP Template

ICP Cells

Host Software

Layer

Link 1

Link n

Management

Plane

Management

Rx ICP Channel

IMA Tx

ICP Cells

Link 1

Link n

Interrupts

Microcode

Routine

Microcode

Routine

IMA Parameters

Interrupts

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