Inverse Multiplexing for ATM (IMA)
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
Freescale Semiconductor 33-61
33.5.3.6 Transmit Group State Machine Control
Define the IMA group(s)
Assign IMA ID
Assign Link IDs and the transmit group order table
Assign TRL
Assign IMA frame size (M)
Signal group parameters via ICP cells
Define ATM pace controller (APC) parameters for this trans mit group
Signal transmit group state via ICP cells
Negotiate transmit group parameters with the far end
Check status of links in group to make ‘Sufficient Links’ determination
Control group operation (via IGTCNTL[TXSC]) in coordination with group state
Coordinate link state transitions with group state transitions during group startup and link addition
33.5.3.7 Group Symmetry Control
All types of group symmetry (operation and configuration) are supportable. This is facilitated by the ability
to independently enable/disable links (via RXPHYEN and TXPHYEN) and to control link and group
states (via independent link and group transmit and receive parameters).
33.5.3.8 ICP End-to-End Channel Transmission
Can send information on end-to-end channel by updating field in Tx ICP.
No Rx support is provided for end-to-end channel.
33.5.3.9 Link Addition and Slow Recovery (LASR) Procedure
Coordinate addition of links for both receive and transmit, including the following:
Establishing their parameters
Checking for defects
On-the-fly insertion into data structures
33.5.3.10 Failure Alarms
React to errors signalled in received ICP cells
React to physical layer errors
Monitor persistence of errors to determine alarm condition.
Report receive defects within 2M cells of entering defect state
Signal upper-layer software