CN8237EBGB Mindspeed Technologies, CN8237EBGB Datasheet - Page 222

• 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

7.0 OAM Functions
7.4 PM Processing
7.4.2 Setting Up Channels for PM Operation
7.4.3 PM Operation
7-12
Forward Monitoring PM
7.4.3.1 Generation of
Cells
When the CN8237 receives a PM activation cell (OAM Type = 1000, Function
Type = 0000), or when the user decides to activate PM processing on a channel,
the host (or local) processor must enable PM on the applicable channel by setting
the PM_EN bits in the RSM and SEG VCC table entries to logic high, and
selecting an unused PM_INDEX (0–127).
entries. The format of each entry of the SEG_PM table is illustrated in
while the format of each entry of the RSM_PM table is illustrated in
RSM VCC table entry and the SEG VCC table entry for that channel.
in both the RSM VCC table entry and the SEG VCC table entry set high, and the
PM_INDEX pointing to the same location. In addition, a RSM and SEG VCC
table entry must be configured corresponding to VCI=3 or VCI=4.
set FWD_MON = 0.
processor sends an activation confirmed OAM cell to the originator.
PM processing operates automatically on any channel until stopped by clearing
the PM_EN fields in the SEG VCC table entry and the RSM VCC table entry.
processing. See
The segmentation coprocessor generates a forward monitoring PM cell at the end
of each PM block, as defined by the BLOCK_SIZE field in the SEG_PM table
for any PM_INDEX. It determines the point to generate a forward monitoring cell
by following these processes:
The host then initializes the corresponding SEG_PM and RSM_PM table
The assigned PM_INDEX value for that channel has to be written to both the
For F4 flows, each VCI channel in the VPI group must have the PM_EN bits
To initialize backward reporting without forward monitoring on any channel,
Once the SEG_PM and RSM_PM table entries have been initialized, the
PM-OAM cells are not included in the NRM cell count, as part of ER
• At the point of initialization of PM processing or when a forward
• As each data cell is segmented, the SEG coprocessor increments the
• When the BLOCK_COUNT number reaches the block size specified by
monitoring cell is sent, the SEG coprocessor sets the BLOCK_COUNT
field to 0. It also increments Monitoring Cell Sequence Number (MSN),
and re-initializes the BIP field to 0.
BLOCK_COUNT number and updates the BIP field.
the BLOCK_SIZE field, signifying the end of the PM block, the SEG
coprocessor generates a new forward monitoring PM cell and starts these
processes again.
Mindspeed Technologies
Chapter
ATM OC-12 ServiceSAR Plus with xBR Traffic Management
6.0, for details.
™
28237-DSH-001-C
Table
Table
CN8237
7-8.
7-6,