ZL30226/GA ZARLINK [Zarlink Semiconductor Inc], ZL30226/GA Datasheet - Page 39

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

2.4.6
The IMA controller produces the cell stream to be sent to the TDM blocks using the following four cell types:
•
•
•
•
At an IDCR clock tick, the RoundRobin scheduler inserts either an ICP cell, a User cell or a Filler cell into the TX
Link FIFO of the next link of the IMA group, based on ascending link ID numbers. An ICP cell is inserted every M
cells and a stuff event is inserted when indicated by the stuffing algorithm.
If it is not time for an ICP cell and if the traffic is not enabled for the link, then a Filler cell is inserted in the TX Link
FIFO. If the traffic is enabled and there is a User cell in the TX IMA Utopia FIFO, then the User cell is transferred
from the TX IMA UTOPIA FIFO to the TX Link FIFO. If there is no User cell in the TX IMA UTOPIA FIFO, then a
Filler cell is inserted in the TX Link FIFO.
2.4.7
Once per IMA frame, an ICP cell is transmitted on each link of the IMA Group. The content of the ICP cell is
controlled both by ZL30226/7/8 and software. The software content of the ICP cell bytes is stored in buffer RAM. A
copy of the ICP cell for each group is kept in the internal Transmitter Cell RAM.
The ICP cell to be transmitted on each link is assembled on an as required basis under the control of the internal
RoundRobin scheduler and ICP Cell Modifier.
18-49
52-53
Byte
1-5
Data cells received from the UTOPIA port (User cells)
Filler cells
IMA ICP cells with Link status information
Stuff cells
10
11
12
13
14
15
16
17
50
51
6
7
8
9
IMA Controller (RoundRobin Scheduler)
ICP Cell Generator
Group Status and Control
Link Status and Control
IMA Frame Sequence
Status Change Indic.
End-to-End Channel
Link Stuff Indication
CRC Error Control
ICP Cell Header
RX Test Pattern
TX Test Pattern
Cell ID, Link ID
ICP Cell Offset
Description
Test Control
OAM label
Sync. Info.
Unused
IMA ID
Content of Header is under S/W control. The HEC is calculated by H/W.
S/W control
Hardware Control. The Link ID is programmed by S/W via other registers.
Hardware Control
H/W Control (Programmed by S/W through other registers)
H/W Control (Programmed by S/W through other registers)
H/W Control
S/W Control
S/W Control except for value of M
H/W Control (Programmed by S/W through other registers)
S/W Control
S/W Control
S/W Control
S/W Control
S/W Control
S/W Control
H/W Calculation
Table 2 - ICP Cell Description
Zarlink Semiconductor Inc.
ZL30226/7/8
39
Control Source
Data Sheet