mt90224 Zarlink Semiconductor, mt90224 Datasheet - Page 31

• Manufacturer Part Number: mt90224
• Description: 8-port Ima/tc Phy Device
• Manufacturer: Zarlink Semiconductor

The IMA implementation is divided into hardware and software functions. The MT90222/3/4 implements the
hardware functions. The software functions are implemented by the user or Zarlink IMA Core. The hardware and
software functions are described below. Notice that a number of MT90222/3/4 functions are included to assist in the
collection of statistical information. This information supports the MIB implementation.
1.1
For the MT90222/3/4 to comply with the IMA specification, the following functions must be implemented by
software:
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1.1.1
The software implemented transmit and receive LSMs are independent (i.e., each link has its own LSM). LSMs rely
on various events from: the MT90222/3/4 interface, such as cell errors, excessive delay between-links, etc.; or,
from the T1/E1/J1/DSL framer, such as Loss Of Signal (LOS), Loss Of Frame (LOF), Remote Alarm Indication
(RAI) etc.
On-chip registers are used to generate the ICP cells that communicate the LSM states at the Far End (FE).
1.1.2
The IMA GSMs and Group Traffic State Machines (GTSM) must be implemented in software. One of each state
machine should be implemented for each IMA Group.
On-chip registers are used to generate the ICP cells that communicate the various states to the FE.
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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the transmit and receive Link State Machines (LSM)
the IMA Group State Machines (GSM)
the IMA Group Traffic State Machines (GTSM)
the Operations and Maintenance (OAM) functions
adding or removing one or more serial links
providing feedback to the ATM network for adjusting the ATM traffic.
Software Functions
Link State Machines
IMA Group State Machines
Link Addition, Removal or Restoration
Interrupts
Signalling and Rate Adjustment
Zarlink Semiconductor Inc.
MT90222/3/4
31
Data Sheet