參數(shù)資料
型號: IDT82V2608
廠商: Integrated Device Technology, Inc.
英文描述: INVERSE MULTIPLEXING FOR ATM
中文描述: 反向復(fù)用的ATM
文件頁數(shù): 18/98頁
文件大?。?/td> 398K
代理商: IDT82V2608
INTERFACE
18
December 4, 2006
IDT82V2608
Inverse Multiplexing for ATM
3
INT ERFACE
3.1
UTOPIA INTERFACE
The Utopia interface operates in Level 2 mode. The IDT82V2608
supports up to 8 Utopia Level 2 ports. Each port is assigned an address
ranging from0 to 30. The address value of 31 is reserved and should
not be used. All the 31 ports can be individually enabled or disabled by
ConfigUtopiaIF
command.
Each IMA group or UNI link corresponds to a port. For each IMA
group, the port address can be assigned by
ConfigGroupInterface
command. For each UNI link, the port address can be assigned by
ConfigUNILink
command. Inside the device, each port corresponds to
a GCF (Group Cell FIFO) which is 2 cells deep.
The IDT82V2608 uses cell level handshake for cell transfer. One
entire cell is transferred before another port can be selected. The start of
a cell is marked by TxSOC and RxSOC signals in the transmt and the
receive directions respectively. These two signals are active during the
first byte of a cell.
3.1.1
UTOPIA LOOPBACK FUNCTION
For diagnostic purpose, the capability to loop back all Utopia traffic to
Utopia bus is provided. This loopback is called Utopia loopback and can
be enabled by
ConfigLoopMode
command. In this mode, cells are
taken fromTGCFs (Transmt Group Cell FIFO) and sent to the respec-
tive RGCFs (Receive Group Cell FIFO). When in Utopia loopback mode,
cells will not be transmtted to the line interface. Refer to
Figure-3
.
Figure-3 Utopia Loopback
UTOPIA Interface
Tx
Group
Cell
FIFO 1
Rx
Group
Cell
FIFO 1
Tx
Group
Cell
FIFO 0
Rx
Group
Cell
FIFO 0
……
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