MT90222AG Zarlink Semiconductor, MT90222AG Datasheet - Page 33

• Manufacturer Part Number: MT90222AG
• Description: Description = 4 Port Ima & TC PHY For T1, E1 And DSL ;; Package Type = N/a ;; No. Of Pins =
• Manufacturer: Zarlink Semiconductor

1.1.3
The addition, removal or restoration of a link is controlled by software using the various control registers in the
MT90222/3/4 and in the T1/E1J1/DSL framers. Decisions are based on the MT90222/3/4 and typically
T1/E1/J1/DSL framer status registers.
1.1.4
The MT90222/3/4 provides numerous registers and counters to implement a polling and/or interrupt mechanism for
tracking link and IMA Group status. This traffic in and out information is used by the Management Information Base
(MIB) for each IMA Group.
1.1.5
The microprocessor controls the operation of the serial links by providing handshaking between the Far End (FE)
and Near End (NE) including such functions as signaling and loopback controls. Rate adjustment is controlled by:
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1.1.6
Software implements most of the performance monitoring. The MT90222/3/4 provides status information for:
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It also provides the content for received ICP cells that contain some changes. The external T1/E1/J1/DSL framers
provide the low level status of the link. The software integrates and responds to the various events.
1.2
The MT90222/3/4 circuitry implements the following functions:
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adding or removing one or more serial links
providing feedback to the ATM network for adjusting the ATM traffic.
the Cell Delineation Block and IMA Frame State Machine
the number of ICP violations
the total number of cells
the total number of User cells
the number of idle or discarded cells.
UTOPIA L1 and L2 Interface (8 or 16 bit wide, up to 52MHz)
verification of the incoming HEC (optional)
generation of a new HEC byte
transmit scheduler
generation of the TX IMA Data Cell Rate (IDCR) clock
generation and insertion of ICP cells, Filler Cells and Stuff Cells in IMA mode
generation of Idle Cells in TC mode (from on-chip copies of the cell)
flexible serial link (TDM) formatting of the outgoing bytes
retrieval of ATM Cells from the incoming flexible TDM format
cell delineation
retrieval and processing of ICP cells
synchronization of the IMA Frame
Hardware Functions
Link Addition, Removal or Restoration
Interrupts
Signalling and Rate Adjustment
Performance Monitoring
Zarlink Semiconductor Inc.
MT90222/3/4
33
Data Sheet