Freescale Semiconductor PowerQUICC MPC885 Reference Manual page 38

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Number
43.3.3 UTOPIA Multi-PHY Master Operation .................................................................... 43-7
43.3.4 UTOPIA Multi-PHY Slave Operation....................................................................... 43-7
44.1 AAL2 Features and Restrictions.................................................................................... 44-1
44.2 Overview of the AAL2 Implementation........................................................................ 44-1
44.2.1 AAL2 Transmit Overview ......................................................................................... 44-2
44.2.2 AAL2 Receive Overview........................................................................................... 44-4
44.3 AAL2 Interface with the Host ....................................................................................... 44-5
44.4 AAL2 Data Structures for Transmit............................................................................... 44-5
44.4.1 Transmit Packet Descriptor (TPD) ............................................................................ 44-5
44.4.2 AAL2_Tx_Queue ...................................................................................................... 44-7
44.4.3 AAL2 Transmit Connection Table (AAL2_TCT) ..................................................... 44-7
44.4.4 Example of AAL2 Transmit .................................................................................... 44-10
44.4.5 Built-in Timer CU Support ...................................................................................... 44-11
44.4.5.1 Algorithm Description ......................................................................................... 44-11
44.4.5.1.1 Starting the Timer for a Partially-Filled Active Buffer ................................... 44-12
44.4.5.1.2 Countdown Mechanism and Detection of Expired Buffers............................. 44-12
44.4.5.2 Example of Timer CU Implementation ............................................................... 44-13
44.5 AAL2 Data Structures for Receive .............................................................................. 44-13
44.5.1 Receive Packet Descriptor (RPD)............................................................................ 44-13
44.5.2 AAL2_Rx_Queue .................................................................................................... 44-16
44.5.3 AAL2 Receive Connection Table (AAL2_RCT) .................................................... 44-17
44.5.4 Example of AAL2 Receive...................................................................................... 44-19
44.6 Systems Restrictions When Using the AAL2 Functionality ....................................... 44-20
44.7 Global AAL2 Data Structures...................................................................................... 44-20
44.7.1 AAL2 Parameter RAM............................................................................................ 44-20
44.7.2 Mapping the AAL2 Connection Tables in External Memory.................................. 44-24
44.8 DPRAM Usage for AAL2 ........................................................................................... 44-24
44.9 AAL2 Exceptions ........................................................................................................ 44-24
44.9.1 AAL2 Transmit Exceptions ..................................................................................... 44-26
44.9.2 AAL2 Receive Exceptions....................................................................................... 44-26
44.10 Initialization of MPC885 for AAL2 Operation ........................................................... 44-26
44.10.1 Initialization of AAL0 Structures for AAL2 Channels ........................................... 44-26
44.10.2 Initialization of Address Translation Mechanism.................................................... 44-27
44.10.3 Initialization of Global AAL2 Structures ................................................................ 44-27
44.10.4 Reconfiguring AAL2 Channels ............................................................................... 44-27
44.10.5 Initialization of Timer CU Mechanism (Optional) .................................................. 44-28
44.11 Performance Estimation............................................................................................... 44-28
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Contents
Title
Chapter 44
AAL2 Implementation
MPC885 PowerQUICC Family Reference Manual, Rev. 2
Page
Number
Freescale Semiconductor