MT90220 参数 Datasheet PDF下载

MT90220

Table of Contents

1.0 Device Architecture .......................................................................................................................................

1.1 Software Functions.....................................................................................................................................

1.1.1 Link State Machines...........................................................................................................................

1.1.2 IMA Group State Machines ................................................................................................................

1.1.3 Link Addition, Removal or Restoration...............................................................................................

1.1.4 Interrupt..............................................................................................................................................

1.1.5 Signaling and Rate Adjustment..........................................................................................................

1.1.6 Performance Monitoring.....................................................................................................................

1.2 Hardware Functions ...................................................................................................................................

8

8

8

8

8

8

8

8

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

i