CN8237EBGB Mindspeed Technologies, CN8237EBGB Datasheet - Page 161

• 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
6.1.2 ABR Flow Control Manager
Figure 6-2. ABR Flow Control
28237-DSH-001-C
ABR Flow Control
Templates
Manager
ABR
UPDATE
RATE
The CN8237 implements the ATM Forum ABR flow control algorithms, referred
to in the aggregate as ABR by this document. The ABR service category
effectively allows zero cell loss transmission through an ATM network, by
regulating transmission based upon network feedback. The ABR algorithms
regulate the rate of each VCC independently.
diagram of the CN8237’s ABR feedback control loop.
ABR Flow Control Manager. This state machine processes the feedback
information according to per-VCC parameters and user-programmable ABR
templates, both located in SAR SEG-shared memory. These templates define
ABR service parameters and policies for groups of VCCs.
Scheduler with an updated rate. Under the policy imposed by the template, the
rate complies with the TM 4.1 Source Behavior specifications. Until the next
update, the Cell Scheduler uses this rate to dynamically schedule the connection.
Network feedback is received by the reassembly coprocessor and routed to the
Once the feedback is processed, the Flow Control Manager provides the Cell
Cell Scheduler
Parameters
and Priority
Schedule
Dynamic
Per-VCC
Table
Mindspeed Technologies
VCC_INDEX
Segmentation
Coprocessor
Coprocessor
Reassembly
™
Figure 6-2
Cell Stream
Feedback
ABR
RM Cell
shows a high level block
6.0 Traffic Management
6.1 CN8237 Overview
Network
ATM
8237_057
6-5