CN8236EBGB Mindspeed Technologies, CN8236EBGB Datasheet - Page 111
CN8236EBGB
Manufacturer Part Number
CN8236EBGB
Description
ATM SAR 155Mbps 3.3V ABR/CBR/GFR/UBR/VBR 388-Pin BGA
Manufacturer
Mindspeed Technologies
Datasheet
1.CN8236EBGB.pdf
(443 pages)
Specifications of CN8236EBGB
Package
388BGA
Traffic Class
ABR|CBR|GFR|UBR|VBR
Utopia Type
Level 1|Level 2
Host Interface
PCI
Maximum Data Rate
155 Mbps
Typical Operating Supply Voltage
3.3 V
Minimum Operating Supply Voltage
3 V
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28236-DSH-001-B
5.0 Reassembly Coprocessor
5.1 Overview
The reassembly (RSM) coprocessor processes cells received from the ATM PHY
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 CN8236 supports AAL5, AAL3/4, and AAL0 reassembly, and
cell mode (1-cell PDUs through a Virtual FIFO buffer, 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 and AAL information are passed to the host on one of 32 independent
status queues.
reassembly coprocessor. For detailed information on how the CN8236 handles
PM cells, deals with OAM functions, and interacts with the segmentation
coprocessor in handling traffic management and scheduling, refer to
and
The CN8236 reassembles up to 64 K VCCs simultaneously. Individual
CPCS-PDU payload data, the CPCS-SDU, fills the host-supplied data buffers
The CN8236 extracts the CPCS-SDU from the CPCS-PDU, writes the SDU to
This chapter provides information on the functions and data structures of the
Chapter
Mindspeed Technologies
7.0.
5
™
Chapter
6.0,
5-1
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