mt90224 Zarlink Semiconductor, mt90224 Datasheet - Page 38

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

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.
18-49
52-53
Byte
Data cells received from the UTOPIA port (User cells)
Filler cells
IMA ICP cells with Link status information
Stuff cells
1-5
10
11
12
13
14
15
16
17
50
51
6
7
8
9
IMA Controller (RoundRobin Scheduler)
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
Sync. Info.
OAM label
Unused
IMA ID
Content of Header is under S/W control. The HEC is calculated by H/W.
Hardware Control
H/W Control (Programmed by S/W through other registers)
H/W Control (Programmed by S/W through other registers)
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
H/W Calculation
S/W control
Hardware Control. The Link ID is programmed by S/W via other registers.
H/W Control
S/W Control
Table 2 - ICP Cell Description
Zarlink Semiconductor Inc.
MT90222/3/4
38
Control Source
Data Sheet