MT90220
Table of Contents
1.0 Device Architecture ....................................................................................................................................... 8
1.1 Software Functions..................................................................................................................................... 8
1.1.1 Link State Machines........................................................................................................................... 8
1.1.2 IMA Group State Machines................................................................................................................ 8
1.1.3 Link Addition, Removal or Restoration............................................................................................... 8
1.1.4 Interrupt.............................................................................................................................................. 8
1.1.5 Signaling and Rate Adjustment.......................................................................................................... 8
1.1.6 Performance Monitoring..................................................................................................................... 8
1.2 Hardware Functions ................................................................................................................................... 9
2.0 The ATM Transmit Path................................................................................................................................. 9
2.1 Cell_In_Control........................................................................................................................................... 9
2.2 The ATM Transmission Convergence...................................................................................................... 10
2.2.1 TX Cell Ram and TX FIFO Length................................................................................................... 10
2.3 Parallel to Serial PCM Interface ............................................................................................................... 11
2.4 ATM Transmit Path in IMA Mode ............................................................................................................. 11
2.4.1 IMA Frame Length (M)..................................................................................................................... 11
2.4.2 Position of the ICP Cell in the IMA Frame........................................................................................ 11
2.4.3 Transmit Clock Operation ................................................................................................................ 11
2.4.4 Stuff Cell Rate.................................................................................................................................. 12
2.4.5 IMA Data Cell Rate .......................................................................................................................... 12
2.4.6 IMA Controller (RoundRobin Scheduler).......................................................................................... 12
2.4.7 ICP Cell Generator........................................................................................................................... 12
2.4.8 IMA Frame Programmable Interrupt ................................................................................................ 14
2.4.9 Filler Cell Definition .......................................................................................................................... 14
2.4.10 TX IMA Group Start-Up.................................................................................................................... 14
2.4.11 TX Link Addition............................................................................................................................... 14
2.4.12 TX Link Deletion............................................................................................................................... 14
2.5 ATM Transmit Path in UNI Mode ............................................................................................................. 15
3.0 The ATM Receive Path................................................................................................................................. 15
3.1 Cell Delineation Function ......................................................................................................................... 15
3.2 De-Scrambling and ATM Cell Filtering..................................................................................................... 16
3.3 ATM Receive Path in IMA Mode .............................................................................................................. 16
3.3.1 ICP Cell Processor........................................................................................................................... 17
3.3.1.1 IMA Frame Synchronization...................................................................................................... 17
3.3.1.2 Link Information......................................................................................................................... 18
3.3.1.3 RX OAM Label .......................................................................................................................... 18
3.3.2 Out of IMA Frame (OIF) Condition................................................................................................... 18
3.3.3 Link Out Of IMA Frame (LIF) Synchronization................................................................................. 18
3.3.4 Filler Cell Handling........................................................................................................................... 18
3.3.5 Stuff Cell Handling ........................................................................................................................... 18
3.3.6 Received ICP Cell Buffer ..................................................................................................................18
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