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參數(shù)資料
| 型號(hào)： | MT90221AL |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Quad IMA/UNI PHY Device |
| 中文描述： | 四IMA的/單向物理層設(shè)備 |
| 文件頁(yè)數(shù)： | 25/114頁(yè) |
| 文件大?。?/td> | 304K |
| 代理商： | MT90221AL |
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MT90221
17
3.3.1
In IMA mode, the transmitter inserts special ICP cells
in the various outgoing streams every M ATM cells to
comply with the IMA specification. The receive block
is using these ICP cells to synchronize with the Far
End transmit side and to reconstruct the ATM cell
original sequence.
ICP Cell Processor
3.3.1.1
The
Synchronization State Machines (IFSM) for each
link, as described in Section 11 of the IMA
Specification. The values of Alpha, Beta and Gamma
are programmable through the
Frame Delineation
register. Their values are the same for all links.
IMA Frame Synchronization
MT90220
implements
IMA
Frame
After the link is programmed to be in IMA mode by
writing to the
RX Link Control
register, the IMA
Frame State Machine is enabled. At the same time,
the parameter’s value of the RX link are latched in
internal reference registers and are used to
determine if the received ICP cell meets the valid
IICP
cell
criteria
to
synchronization. Refer to section 3.3.1.2 and 3.3.1.3
for the list of link’s parameters.
determine
IMA
frame
Incoming ICP cells are automatically detected by the
ICP Processing block. As soon as one valid ICP cell
is received, the IMA Frame State Machine moves to
the IMA PRESYNC state. When Gamma-valid ICP
cells are received, the state machine moves to the
IMA SYNC state. In the IMA PRESYNC state, one
errored or missing ICP cell causes the state machine
to return to the IMA HUNT state. In the IMA SYNC
state, the state machine is forced to the IMA HUNT
state by any of the following events:
one missing ICP cell
Alpha consecutive invalid ICP cells
Beta consecutive errored ICP cells
Bits 3 and 2 of the
RX State
register report the IMA
Frame State Machine state for a selected link. When
in IMA HUNT mode, the information required to
perform the verification is extracted from the ICP
cells received.
After the received information is validated, the IMA
Group is configured by writing to the
RX Reference
Link Control
, the
RX Link Control
Recombiner
registers.
and
RX
Figure 7 - The MT90221 Receiver Circuit in IMA Mode
Processing
ICP
IMA
Frame
State
Cell
Delineation
S/P
Machine
RXCK
RXSYNC
DSTi
RAM
Controller
RX
Scheduler
UTOPIA
Interface
Rate
Recovery
Recovered
Cell CLK
RAM Area
ICP Cell
With Changes
Buffer
Link Info
Registers
Micro
Processing
ICP
IMA
Frame
State
Cell
Delineation
S/P
Machine
RXCK
RXSYNC
DSTi
[0]
[3]
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT90222 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:4/8/16 Port IMA/TC PHY Device |
| MT90222AG | 制造商:Microsemi Corporation 功能描述:ATM IMA 40MBPS 2.5V 384BGA - Trays |
| MT90222AG2 | 制造商:Microsemi Corporation 功能描述:ATM IMA 40MBPS 2.5V 384BGA /BAKE/DRYPACK - Trays |
| MT90223AG | 制造商:Microsemi Corporation 功能描述:ATM IMA 80MBPS 2.5V 384BGA - Trays |
| MT90223AG2 | 制造商:Microsemi Corporation 功能描述:ATM IMA 80MBPS 2.5V 384BGA - Trays |
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