RS8234 Mindspeed Technologies, RS8234 Datasheet - Page 105
RS8234
Manufacturer Part Number
RS8234
Description
Atm Servicesar Plus With Xbr Traffic Management
Manufacturer
Mindspeed Technologies
Datasheet
1.RS8234.pdf
(401 pages)
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28234-DSH-001-B
5.0 Reassembly Coprocessor
5.1 Overview
The reassembly (RSM) coprocessor processes cells received from the ATM
Physical Interface block. The coprocessor extracts the AAL SDU payload from
the received cell stream and reassembles this information into buffers supplied by
the host system. The RS8234 supports AAL5, AAL3/4, and AAL0 reassembly, as
well as cell mode (1-cell PDUs through a Virtual FIFO, for CBR voice traffic).
connections are identified through separate VPI and VCI Index Table structures.
The VPI/VCI Index Table mechanism provides very fast consistent channel
identification over the full range of VPI/VCI addresses.
assigned to each VCC. The host assigns each VCC to one or two of 32
independent buffer pools, from which the RSM coprocessor draws buffers as
needed.
host-supplied buffers, and performs all CPCS-PDU checks. The results of these
checks, as well as AAL information, are passed to the host on one of 32
independent status queues.
reassembly coprocessor.
OAM functions and interacts with the segmentation coprocessor in handling
traffic management and scheduling, refer to
The RS8234 reassembles up to 64 K VCCs simultaneously. Individual
CPCS-PDU payload data, the CPCS-SDU, fills the host-supplied data buffers
The RS8234 extracts the CPCS-SDU from the CPCS-PDU, writes the SDU to
This chapter provides information on the functions and data structures of the
For detailed information on how the RS8235 handles PM cells, deals with
Mindspeed Technologies
5
™
Chapter 6.0
and
Chapter
7.0.
5-1
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