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參數(shù)資料
| 型號(hào)： | XRT7245 |
| 廠商： | Exar Corporation |
| 英文描述： | DS3 ATM User Network Interface(DS3異步傳輸模式用戶(hù)網(wǎng)絡(luò)接口) |
| 中文描述： | DS3自動(dòng)柜員機(jī)用戶(hù)網(wǎng)絡(luò)接口（DS3異步傳輸模式用戶(hù)網(wǎng)絡(luò)接口） |
| 文件頁(yè)數(shù)： | 265/324頁(yè) |
| 文件大?。?/td> | 4103K |
| 代理商： | XRT7245 |
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á
PRELIMINARY
DS3 UNI FOR ATM
XRT7245
REV. 1.03
265
Figure 81 presents an illustration depicting how the
Receive Cell Processor handles incoming Segment-
type OAM cells, if the user has written a “1” to bit 3
(OAM Check Bit) of the “Rx CP Configuration” register.
7.3.2.4.2
“End-to-End” type OAM cells, as the name implies, are
intended for something more than a point-to-point trans-
mission. In other words, an end-to-end type OAM cell
will be created at a source node, transmitted across a
single link, to a destination node. However, in this
case, the “end-to-end” OAM cell is not terminated at
this destination node; but is rather transmitted across
other links to other nodes within the network.
End-to-End Type OAM Cells
How the Receive Cell Processor Handles End-to-
End type OAM Cells
If the Receive Cell Processor determines that the in-
coming OAM Cell is an “End-to-End” type then it will
be written into the Rx FIFO, within the Receive UTOPIA
Interface block. This act will allow the ATM Layer
processor to read in this OAM cell, from the UNI and
propagate this cell to other nodes in the network.
Note:
The Receive Cell Processor will write the “End-to-
End” OAM cell to the Rx FIFO, independent of the User
Cell Filter settings.
The user can also configure the Receive Cell Processor
to write the contents of the “End-to-End” OAM cell
into the Receive OAM Cell Buffer. For details on how
this can be done, please see Section 7.3.2.4.1.
Figure 82 presents an illustration which depicts how
the Receive Cell Processor handles incoming End-
to-End type OAM Cells, if the user has written a “1” to
bit 3 (OAM Check Bit) of the “Rx CP Configuration”
register.
Monitoring the Number of User/OAM Cells
The user can monitor the number of Valid cells (User
and OAM) that have been received by the Receive
Cell Processor, by reading the PMON Received Valid
Cell Count Registers (Address = 34h, and 35h). The
bit-format of these registers are presented below.
F
IGURE
81. A
N
A
PPROACH
TO
P
ROCESSING
S
EGMENT
OAM
CELLS
,
VIA
THE
R
ECEIVE
C
ELL
P
ROCESSOR
.
User Cell Filter
Receive Cell Processor
Rx FIFO
Receive Utopia Block
Cell
Delineation
HEC
Verification
Utopia
Interface
Path of OAM Cell
OAM Cell Buffer
Located at Address
(161h - 1A1h) in on-
Chip RAM.
OAM Cell is not “passed
through” to the Rx FIFO in
the Receive Utopia Block
F
IGURE
82. A
PPROACH
TO
P
ROCESSING
“E
ND
-
TO
-E
ND
” OAM C
ELLS
User Cell Filter
Receive Cell Processor
Rx FIFO
Receive Utopia Interface Block
Cell
Delineation
HEC
Verification
Utopia
Interface
Receive OAM Cell Buffer
Located at Address
(161h - 1A1h) in on-
Chip RAM.
“End-to-End” Type OAM
Cell is “passed through” to
the Rx FIFO in the Receive
Utopia Interface Block
The Contents of
the OAM Cell are
also written into
the “Receive OAM
Cell” buffer
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