Motorola PowerQUICC II MPC8280 Series Reference Manual page 1212

Features
I
Table 34-1. IMA Sublayer in Layer Reference Model
Layer Sublayer
ATM —
• ATM cell stream splitting
• ICP Cell Insertion &
IMA Specific
Transmission • Cell Rate decoupling
Convergence • IMA frame synch
• Stuffing
• Discarding bad-HEC cells
Physical
• No cell discarding
• No cell rate decoupling
Interface
• Cell delineation
Specific
• Cell scrambling &
Transmission
Convergence
• Header error correction
• HEC generation &
Physical • Bit timing
Medium • Line coding
Dependent • Physical Medium
The MPC8280's IMA microcode alone does not implement all of these functions. Software
running on the MPC8280 is responsible for managing the start-up procedure, handling
changes in group control, status, and maintaining the Link State Machine and Group State
Machine. In general, the MPC8280 IMA microcode implements most of the IMA sublayer
user plane functions and provides interrupts/statistics for the layer and plane management
functions.
The key features of the IMA microcode are:
• Supports any FCC with multi-PHY UTOPIA capability
• Supports both IMA links and non-IMA links on the same FCC (on a per-PHY basis)
• Supports up to 8 IMA groups with one FCC
• Supports up to 8 links per IMA group using an internal TC layer hardware
• Supports up to 31 links per IMA group using an external TC layer device. Note that
a maximum of 31 total links can be supported either on FCC1 or FCC2 but not
concurrently on both FCCs)
• Performs the following IMA User Plane functions
— ATM cell stream splitting and reconstruction
— ICP cell insertion/removal--communication of control and framing information
— Cell rate decoupling--insertion of 'filler' cells when ATM layer cells are
unavailable
34-2
Freescale Semiconductor, Inc.
User Plane
Functions
—
and reconstruction
Removal
descrambling
verification
MPC8280 PowerQUICC II Family Reference Manual
For More Information On This Product,
Go to: www.freescale.com
Layer Management
Functions
—
• IMA connectivity
• ICP cell errors (OIF)
• LIF/LODS/RDI-IMA defect
processing
• RDI-IMA alarm generation
• Tx/Rx IMA link state report
—
• HEC error indication
• LCD-RDI alarm
Generation
• Local alarm processing
• RDI alarm generation
Plane Management
Functions
—
• IMA group configuration
• Link addition/removal
• ATM cell rate change
• IMA group failure
notification
• IMA statistics
—
• LCD failure notification
• TC statistics
• Link failure notification
• PMD state
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