Motorola PowerQUICC II MPC8280 Series Reference Manual page 1268

IMA Software Interface and Requirements
34.5.3.1 System Definition
• Definition of P(Rx) and P(Tx)—software variables which are used to determine
"sufficient links"
34.5.3.2 General Operation
• React to received ICP cells. ICP cells are only received when their SCCI field
changes, except the first received ICP cell
• Report any NE and FE timing mode mismatches (ITC vs. CTC) to the Unit
Management
34.5.3.3 Receive Link State Machine Control
• Set up unassigned links, awaiting ICP cells
— Define either as standard multi-PHY or as unassigned IMA link
— Set up receive channel for ICP OAM cells for this link only
• Create and initialize delay compensation buffer
• Respond to received ICP cells. Extract and validate link/group parameters
— IMA ID
— Link ID
— Link ICP offset
— IMA frame size (M)
• After establishment of group, change receive channel for ICP OAM cells such that
all links in the group point to the same channel
• Control link operation (via ILRCTNL[RXSC]) in coordination with link and group
states
34.5.3.4 Receive Group State Machine Control
• Coordinate receive links, using received ICP cells to identify a proposed group
• Establish and validate group parameters in conjunction with the received link states
and parameters
— IMA version
— IMA ID
— Group order table
• Enable delay synchronization for the group, and react to its completion
• Control group operation (via IGRCNTL[RXSC]) in coordination with group state
• Signal receive group state via ICP cells of corresponding transmit group
34-58
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