Freescale Semiconductor MPC8260 PowerQUICC II Family Reference Manual page 1120

Inverse Multiplexing for ATM (IMA)
received cells (and other event indications) are used by the software to initialize IMA links and groups,
and to manage transitions between link and group states.
The cell reception task centers around a four-state link state machine. Microcode tasks are performed
within each state, but transitions between states are managed by software. The processing of received cells
(both ICP cells and data cells) is determined by the state of the link.
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
33-18 Freescale Semiconductor