CN8237EBGB Mindspeed Technologies, CN8237EBGB Datasheet - Page 219

• Manufacturer Part Number: CN8237EBGB
• Description: ATM SAR 622Mbps 3.3V ABR/CBR/GFR/UBR/VBR 456-Pin BGA
• Manufacturer: Mindspeed Technologies

Specifications of CN8237EBGB

• Package: 456BGA
• Traffic Class: ABR|CBR|GFR|UBR|VBR
• Utopia Type: Level 1|Level 2
• Host Interface: PCI
• Maximum Data Rate: 622 Mbps
• Typical Operating Supply Voltage: 3.3 V
• Minimum Operating Supply Voltage: 3.135 V

CN8237
ATM OC-12 ServiceSAR Plus with xBR Traffic Management
7.3.2 OAM Reassembly Operation
7.3.3 Error Conditions During OAM Reassembly
28237-DSH-001-C
Received OAM traffic should be detected and routed to the global OAM buffer
and status queues (OAM_BFR_QU and OAM_STAT_QU).
coprocessor transfers the 48-octet OAM payload to the next available global data
buffer, and writes a RSM status queue entry.
determine whether it is a PM cell, by seeing if the OAM_TYPE field in the cell is
set to value 0010. That PM detection is performed only on F4 and F5 OAM cells.
the guidelines described in
NOTE:
The RSM coprocessor computes the CRC-10 error detection code for each
received OAM cell’s information fields. If an error is detected (for example, the
computed CRC value does not match the CRC-10 value written in the cell), the
SAR sets the CRC_ERROR bit in the status queue entry to a logic high.
7.4 PM Processing
OAM Performance Monitoring may be enabled for up to 128 VCCs by setting the
PM_EN bits in the RSM VCC table entry and the SEG VCC table entry for that
channel.
The reassembly coprocessor treats OAM cells as one-cell PDUs. The RSM
Once an OAM cell is detected, the RSM coprocessor checks the cell to
If the RSM coprocessor finds the cell is a PM cell, it is processed following
Figure 7-2
OAM cells that get buffers from the global OAM free buffer queue do not
effect the per-VCC firewall calculation.
Mindspeed Technologies
illustrates the functional blocks for PM processing.
Section
7.4.
™
7.0 OAM Functions
7.4 PM Processing
7-9