Motorola PowerQUICC II MPC8280 Series Reference Manual page 1267

responsible for initializing MPC8280 IMA data structures, establishing and tearing down
connections, handling of alarms, keeping statistics, and controlling protocol state machines.
The IMA microcode interfaces to the software-implemented (layer management and plane
management) functions by providing received ICP cells and by interrupts. The
software-implemented functions control the microcode and the system via the IMA root,
group, and link parameters and by providing an ICP cell template to the microcode for ICP
cell transmission.
Layer
Management
Host Software
Plane
Management
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.
MOTOROLA
Freescale Semiconductor, Inc.
Tx ICP Template
Interrupts
IMA Parameters
Interrupts
Rx ICP Channel
Chapter 34. Inverse Multiplexing for ATM (IMA)
For More Information On This Product,
Go to: www.freescale.com
IMA Software Interface and Requirements
ICP Cells
IMA Tx
Microcode
Routine
IMA Rx
Microcode
Routine
ICP Cells
Link 1
Link n
Link 1
Link n
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