cn8237 Mindspeed Technologies, cn8237 Datasheet - Page 218

• Manufacturer Part Number: cn8237
• Description: Atm Oc-12 Servicesar Plus With Xbr Traffic Management
• Manufacturer: Mindspeed Technologies

7.0 OAM Functions
7.3 Reassembly of OAM Cells
7.3.1 Key OAM-Related Fields for OAM Reassembly
7-8
7.3.1.1 Reassembly
7.3.1.2 Reassembly
7.3.1.3 F4 Flow
VCC State Table
Status Queue
7.3 Reassembly of OAM Cells
To enable the reassembly coprocessor to detect and therefore further process
OAM cells, set the OAM_EN bit in RSM_CTRL1 to a logic high.
and OAM_STAT_QU, addresses for both assigned in the RSM_CTRL1 register).
To activate these queues, set the OAM_QU_EN bit in the RSM_CTRL1 register
to a logic high. The CN8237 then routes OAM traffic to these global buffer and
status queues.
NOTE:
The reassembly VCC State table field, SEG_VCC_INDEX, should be written to
point to the channel index of the corresponding segmentation channel. This is
necessary for PM-OAM, as well as ABR channels.
The 3-bit OAM field in the RSM status queue entry must be set to the value
indicated in the RSM status queue structure description for that field. A non-0
value in the OAM field indicates that the cell is an OAM cell.
the CN8237 sets the CRC_ERROR bit in the status queue entry to a logic high.
For F4 flow operation, a separate VCC table entry must be configured.
The CN8237 detects the following OAM cell flows:
• Segment F4 Flow
• End-to-end F4 Flow
• Segment F5 Flow
• End-to-end F5 Flow
• PTI = 6
• PTI = 7
The CN8237 provides global OAM buffer and status queues (OAM_BFR_QU
If the CRC-10 error detection code computation on the OAM cell shows an error,
The cell buffer size must be large enough to hold a complete cell when
OAM detection is enabled.
Mindspeed Technologies
ATM OC-12 ServiceSAR Plus with xBR Traffic Management
™
28237-DSH-001-C
CN8237