MT90222 ZARLINK [Zarlink Semiconductor Inc], MT90222 Datasheet - Page 52

• Manufacturer Part Number: MT90222
• Description: 4/8/16 Port IMA/TC PHY Device
• Manufacturer: ZARLINK [Zarlink Semiconductor Inc]

To reduce the impact of this correction, its implementation can either be immediate or delayed. A command in the
Increment Delay Control (0x0281) or Decrement Delay Control (0x0282) register is used for this purpose (refer
to 3.3.13.6 Incrementing/Decrementing the Recombiner Delay, for more details).
3.2.17
Before an IMA Group can be disabled, the software should ensure that no User cells are left in memory. As part of
the higher level handshaking, the TX FE should have sent Filler cells for a while for the RX side to process all the
User cells that could be in the external memory.
The procedure to follow is to stop the recombination process and then wait for the enable process to be reported
inactive (in the Enable Recombiner Status (0x02AD) register) before re-assigning the link to another IMA group or
to TC Mode.
3.3
Up to sixteen incoming serial (typically TDM) lines can be connected to the MT90222/3/4 receiver and forwarded to
the UTOPIA L2 interface served by an external ATM-Layer device. Figure 10 illustrates four of the sixteen possible
UTOPIA ports that can be addressed through the UTOPIA Interface.
The size of the RX UTOPIA FIFO is fixed at 4 cells. The Idle cells are automatically removed at the RX TDM block
and all other valid received cells are transferred to the RX UTOPIA FIFO. The FIFO is cleared when the RX Utopia
port associated with the FIFO is enabled.
4.0
The Transmit TDM blocks are independent of the Receive TDM blocks. The TX port of a framer can be connected
to any of the MT90222/3/4 TX UTOPIA Input ports and the RX port of a framer can be connected to any of the
MT90222/3/4 RX UTOPIA Output ports.
The TDM interface provides a variety of modes to work with different T1/E1/DSL framers for various applications. In
general, there are four major modes: Single mode, Wire-OR mode, Multiplex mode and Non-framed mode. Each
mode can be further divided into several minor modes.
RXCK
RXSYNC
DSTi
RXCK
RXSYNC
DSTi
RXCK
RXSYNC
DSTi
RXCK
RXSYNC
DSTi
The ATM Receive Path in TC Mode
Description of the TDM Interface
Disabling an IMA Group
S/P
S/P
S/P
S/P
Delineation
Delineation
Delineation
Delineation
(Using Four of Sixteen Possible UTOPIA-Output Ports)
Cell
Cell
Cell
Cell
Figure 10 - Example of TC Mode Operation
System Clock
Zarlink Semiconductor Inc.
MT90222/3/4
Removal
Removal
Removal
Removal
Idle Cell
Idle Cell
Idle Cell
Idle Cell
52
Interface
UTOPIA
Data Sheet