MT90221 Zarlink Semiconductor, MT90221 Datasheet - Page 41

• Manufacturer Part Number: MT90221
• Description: Quad Inverse Multiplexing For Atm (IMA) Device With Flexible Ima And Uni Mode
• Manufacturer: Zarlink Semiconductor

MT90221
5.5
In UNI Mode, each Utopia port inside an MT90221
corresponds to a physical T1 or E1 line. Up to eight
PHY ports can be supported by one MT90221. Up to
eight MT90221 can be connected to a UTOPIA bus.
The ports in the same device represent only one
electrical load on the UTOPIA bus. The UTOPIA
Interface supports up to 31 PHY addresses so a
maximum of 31 PHY addresses are supported by the
MT90221.
The MPHY address at the input port of MT90221
(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, up to eight MT90221s, with up to four
UTOPIA ports each (one port per IMA Group), can
be served by an external UTOPIA L2 ATM-Layer
device. This provides up to 31 different logical IMA-
channels. Note that port 31 (1F in hexadecimal
format) is reserved.
32
UTOPIA Operation in UNI Mode
UTOPIA Operation in IMA Mode
ATM
ATM Layer
Figure 16 - ATM Interface to Multiple MT90221s
Txclk
TxEnb*
TxAddr
TxClav
TxData
TxSOC
Rxclk
RxEnb*
RxAddr
RxClav
RxData
RxSOC
Txclk
TxEnb*
TxAddr
TxClav
TxData
TxSOC
Rxclk
RxEnb*
RxAddr
RxClav
RxData
RxSOC
Physical Layer
5.7
Figure 15 shows the connection of one ATM Device
with one MT90221.
Figure 16 shows the connection of one ATM Device
with more than one MT90221.
Figure 17 illustrates the implementation of a mixed
mode using only 1 MT90221. Links that are not used
for IMA Groups are available in UNI mode. Unused
links are programmed to set their outputs to high
impedance mode.
MT90221
MT90221
ATM Layer
Examples of UTOPIA Operation Modes
ATM
Figure 15 - ATM Interface to MT90221
TxClk
TxEnb*
TxAddr
TxClav
TxData
TxSOC
Rxclk
RxEnb*
RxAddr
RxClav
RxData
RxSOC
Framer
Framer
Framer
Framer
Physical Layer
MT90221
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Framer
Framer