mt90224 Zarlink Semiconductor, mt90224 Datasheet - Page 129

• Manufacturer Part Number: mt90224
• Description: 8-port Ima/tc Phy Device
• Manufacturer: Zarlink Semiconductor

8.2
Traditionally, IMA (Inverse Multiplexing for ATM) is widely adopted in E1/DS1 applications. With the emergence of
G.SHDSL (Single-pair High rate Digital Subscribe Line) standards, it is now viable to apply IMA over SHDSL lines.
This application note provides a solution of IMA over up to 16 G.SHDSL lines. It serves as a reference design of
interfacing ZL30228 to Globespan Virata’s Orion chipset.
MT90222/3/4 is the second-generation IMA device from Zarlink, which supports IMA over 16 serial bit streams
running at a maximum of 2.5 Mbps. It also incorporates a Utopia level 2 bus as ATM interface.
The Orion chipset contains a dual-channel DSL framer and two analog front-ends (AFE). It offers a low-power
high-density solution for G.SHDSL applications.
Connecting MT90222/3/4 and Orion chipset together provides us a complete solution for IMA over G.SHDSL that
meets both IMA specification and G.SHDSL specification.
The MT90224 IMA device shown in this reference design can be replaced by MT90223 (Octal) or MT90222 (Quad),
two IMA devices from the same family. Both MT90223 and MT90222 are pin and functional compatible to MT90224.
A block-level diagram is represented in Figure 25.
Note: The MT9072 is configured in IMA mode.
Connecting the MT90222/3/4 to SHDSL Framers
UTOPIA
Figure 24 - Asynchronous Operations (Using Two MT9072 Octal T1/E1/J1 Framers)
Level 2
BUS
MT90224
TXSYNCio[15]
RXSYNCi[15]
TXSYNCio[0]
RXSYNCi[0]
TXCKio[15]
RXCKi[15]
TXCKio[0]
DSTo[15]
Zarlink Semiconductor Inc.
RXCKi[0]
DSTi[15]
DSTo[0]
MT90222/3/4
DSTi[0]
129
CKi[7]
CKi[0]
FP[7]
DSTi[7]
DSTo[7]
RxBF[7]
RxDLC[7]
FP[0]
DSTi[0]
DSTo[0]
RxBF[0]
RxDLC[0]
MT9072 #2
MT9072 #1
RNEG[0]
RNEG[7]
RPOS[0]
RPOS[7]
TNEG[0]
TNEG[7]
TPOS[0]
TPOS[7]
T2o[70]
T2o[0]
E2i[0]
E2i[7]
Data Sheet
To LIU
To LIU