ZL30226/GA ZARLINK [Zarlink Semiconductor Inc], ZL30226/GA Datasheet - Page 59

• Manufacturer Part Number: ZL30226/GA
• Description: 4/8/16 Port IMA/TC PHY Device for xDSL
• Manufacturer: ZARLINK [Zarlink Semiconductor Inc]

5.3
A single ATM layer device with a UTOPIA L2 MPHY port can be connected to the ATM input port of one ZL30226/7/8.
Another ATM-Layer device using the UTOPIA L2 MPHY input interface is used to receive ATM cells from the
ZL30226/7/8.
The address pins should be set to the value programmed by the management interface.
5.4
When more than one ZL30226/7/8 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 ZL30226/7/8s (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
ZL30226/7/8 device is 40 Mbits/s (totalling 5 MBytes/s per ZL30226/7/8 device).
5.5
In TC Mode, each Utopia port inside an ZL30226/7/8 corresponds to a physical serial TDM (xDSL) line. Up to sixteen
PHY ports can be supported by one ZL30228. Up to eight ZL30226/7/8s can be connected to a UTOPIA bus. The
ports in the same device represent only one electrical load on the UTOPIA bus.The ZL30226/7/8 supports the up to
31 PHY addresses as per UTOPIA specification.
Please also refer to Technical Note ZLAN-88: UTOPIA Interface between MT90224/3/2 and Specific ATM
Controllers, as there might be some limitations on maximum number of output PHY addresses supported depending
on the type of ATM controller that is interfaced with ZL30226/7/8.
The MPHY address at the input port of ZL30226/7/8 (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 ZL30226/7/8s, 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.
Please also refer to Technical Note ZLAN-88: UTOPIA Interface between MT90224/3/2 and Specific ATM
Controllers, as there might be some limitations on maximum number of output PHY addresses supported depending
on the type of ATM controller that is interfaced with ZL30226/7/8.
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). With UTOPIA loopback, only one PHY address can be tested at a
time.
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.
ZL30226/7/8
59
Data Sheet