MT90222AG Zarlink Semiconductor, MT90222AG Datasheet - Page 64

• 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

5.3
A single ATM layer device with a UTOPIA L2 MPHY port can be connected to the ATM input port of one
MT90222/3/4. Another ATM-Layer device using the UTOPIA L2 MPHY input interface is used to receive ATM cells
from the MT90222/3/4.
The address pins should be set to the value programmed by the management interface.
5.4
When more than one MT90222/3/4 is connected to a single ATM Layer device the single TxClav and RxClav scheme
is used. Direct Status Indication and Multiplexed Status Polling schemes are not supported. The necessary polling
is performed by the ATM-Layer device.
The UTOPIA Interface transmit and receive addresses, provided by the ATM-Layer device, are used to de-multiplex
the ATM-cell stream to as many as eight MT90222/3/4s (as limited by the UTOPIA L2 specification’s maximum of
eight device loads and 31 addresses). The maximum total available bandwidth for the serial lines served by each
MT90222/3/4 device is 40 Mbits/s (totalling 5MBytes/s per MT90222/3/4 device).
5.5
In TC Mode, each Utopia port inside an MT90222/3/4 corresponds to a physical serial TDM (T1, E1, J1, DSL) line.
Up to sixteen PHY ports can be supported by one MT90224. Up to eight MT90222/3/4s can be connected to a
UTOPIA bus. The ports in the same device represent only one electrical load on the UTOPIA bus. The MT90222/3/4
supports the full UTOPIA L2 Interface limit of 31 PHY addresses.
The MPHY address at the input port of MT90222/3/4 (TxAddr[4:0]) is used to store the cell in one specific TX UTOPIA
FIFO.
The MPHY address at the output port (RxAddr[4:0]) is used to retrieve the cells from the proper RX UTOPIA FIFO.
5.6
In IMA mode, many MT90222/3/4s, with up to eight UTOPIA ports each (one port per IMA Group), can be served by
an external UTOPIA L2 ATM-Layer device provided the UTOPIA limitation of 31 ports in total is observed. This
provides up to 31 different logical IMA-channels. Note that port 31 (1F in hexadecimal format) is reserved.
5.7
With UTOPIA loopback enabled
interface. The Rx UTOPIA interface will then output these cells.The UTOPIA loopback is enabled by setting the bit
9 in UTOPIA Input Control Register (0x0052).
UTOPIA Operation With a Single PHY
UTOPIA Operation with Multiple PHY
UTOPIA Operation in TC Mode
UTOPIA Operation in IMA Mode
UTOPIA Loopback
, the Tx UTOPIA port will accept cells and loop these back to the Rx UTOPIA
Zarlink Semiconductor Inc.
MT90222/3/4
64
Data Sheet