MT90225AG Zarlink Semiconductor, MT90225AG Datasheet - Page 38

• Manufacturer Part Number: MT90225AG
• Description: Description = 16 Port TC PHY For T1, E1 And DSL ;; Package Type = N/a ;; No. Of Pins =
• Manufacturer: Zarlink Semiconductor

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5.5 UTOPIA Operation with Multiple PHY
When more than one MT90225/226 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 MT90225/226s (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
MT90225/226 device is 40 Mbits/s (totalling 5MBytes/s per MT90225/226 device).
5.6 UTOPIA Loopback
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).
5.7 Examples of UTOPIA Operation Modes
Figure 12 shows the connection of one ATM layer device to MT90225/226.
ATM Layer
ATM
Figure 12 - ATM Interface to MT90225/226
, the Tx UTOPIA port will accept cells and loop these back to the Rx UTOPIA
Zarlink Semiconductor Inc.
TxClk
TxEnb*
TxAddr
TxClav
TxData
TxSOC
Rxclk
RxEnb*
RxAddr
RxClav
RxData
RxSOC
Physical Layer
MT90225/226
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Framer
Framer
Data Sheet