DS3181 Maxim Integrated Products, DS3181 Datasheet - Page 144
DS3181
Manufacturer Part Number
DS3181
Description
Network Controller & Processor ICs DS3-E3 ATM-Packet PH Y with Built-in Line
Manufacturer
Maxim Integrated Products
Datasheet
1.DS3184DK.pdf
(400 pages)
Specifications of DS3181
Product
Framer
Number Of Transceivers
1
Data Rate
44.736 Mbps
Supply Voltage (max)
3.465 V
Supply Voltage (min)
3.135 V
Supply Current (max)
280 mA
Maximum Operating Temperature
+ 70 C
Minimum Operating Temperature
0 C
Mounting Style
SMD/SMT
Package / Case
TEBGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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DS3181/DS3182/DS3183/DS3184
of six is used during all other modes including the DS3 Clear-Channel—OHM; STS-1 Clear-Channel—OHM; and
E3 Clear-Channel—OHM modes. In bit synchronous mode, the serial data stream is demultiplexed into an 8-bit
parallel data stream (as determined by the data path cell boundary updated) before being passed on to cell
filtering.
Figure 10-27. Cell Delineation State Diagram
Sync
Incorrect HEC
Presync
Hunt
Correct HEC
Cell filtering discards specific cell types. The 8-bit parallel data stream is monitored for idle, unassigned, and invalid
cells. (Cells discarded during cell delineation or DSS descrambling are not monitored for cell filtering.) If cell filtering
is enabled and the indicated cell type is found, the cell is discarded. Idle cell, unassigned cell, and invalid cell
filtering are programmable. Idle cells have a header value of 00000000 00000000 00000000 00000001.
Unassigned cells have a header value of xxxx0000 00000000 00000000 0000xxx0. Where x can be any value.
Invalid cells have a header value of xxxxyyyy yyyy0000 00000000 0000xxxx. Where x can be any value and
yyyyyyyy can be any value other than 00000000. All cells discarded are counted. If cell processing is disabled, cell
filtering will not be performed.
Header pattern comparison checks for a specific pattern in the header, and either discards and counts cells with a
matching header (discard match), discards and counts cells without a matching header (discard no match), counts
cells with a matching header (count match), or counts cells without a matching header (count no match). (Cells
discarded during OCD detection, DSS descrambling, or cell filtering processes are not monitored for header pattern
comparison.) The 8-bit parallel data stream is monitored for cells that have a header that matches the comparison
header. In discard match mode, cells with a matching header are counted and discarded. In discard no match
mode, cells without a matching header are counted and discarded. In count match mode, cells with a matching
header are counted and passed on. In count no match mode, cells without a matching header are counted and
passed on. The comparison header and comparison header pattern mode are programmable. If cell processing is
disabled, header pattern comparison will not be performed.
HEC error monitoring checks the HEC and detects errored and correctable cell headers. (Cells discarded during
OCD detection, DSS descrambling, cell filtering, or header pattern comparisons are not monitored for HEC errors.).
HEC Error Monitoring has two states, the "Correction" and "Detection" states. . In the “Correction” state, cells
received without any header errors (good cells) are passed on. Cells received with a single header error
(correctable cells) are corrected and passed on. The corrected cell count is incremented. Cells received with
multiple errors are considered errored cells. If errored cell extraction is enabled, errored cells are discarded, and
the errored cell count is incremented. If errored cell extraction is disabled, errored cells are passed on. If a cell is
144
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