ZL30226/GA ZARLINK [Zarlink Semiconductor Inc], ZL30226/GA Datasheet - Page 117

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

8.0 Application Notes
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.
ZL30228 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 ZL30228 and Orion chipset together provides us a complete solution for IMA over G.SHDSL that meets
both IMA specification and G.SHDSL specification.
The ZL30228 IMA device shown in this reference design can be replaced by ZL30227 (Octal) or ZL30226 (Quad),
two IMA devices from the same family. Both ZL30227 and ZL30226 are pin and functional compatible to ZL30228.
A block-level diagram is represented in Figure 17.
7.3
For ZL30228, the following modes of operation must be selected and programmed:
Serial stream mode of up to 2.5 Mb/s per link.
TxCK is configured as input.
Recommended register settings:
Address (Hex):
Reset Value (Hex):
Address
Direct access
Offset
(Hex)
3C0
3A0
3E0
00
20
40
60
...
Modes of Operation
Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
...
Old ICP cell, Link 0.
New ICP cell, Link 0.
Old ICP cell, Link 1.
New ICP cell, Link 1
...
New ICP cell, Link 14
Old ICP cell, Link 15
New ICP cell, Link 15
Access these locations directly, then use the transfer command
0x0800 - 0x0BFF, 32 Blocks of 32 words (16-bit wide)
unknown
to copy to internal memory.
Table 110 - RX IMA ICP Cell
Zarlink Semiconductor Inc.
ZL30226/7/8
117
Description
Data Sheet