cn8237 Mindspeed Technologies, cn8237 Datasheet - Page 38

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

2.0 Architecture Overview
2.2 High Performance Host Architecture with Buffer Isolation
Figure 2-2. CN8237 Queue Architecture
2-4
Segmentation Function
Reassembly Function
Status Queues
Segmentation
Global OAM
Global OAM
(32)
Host Memory Area
SEG Status Queue
RSM Status Queue
Status Queues
Reassembly
location and availability to the free buffer queues, one of which can be designated
as the Global OAM free buffer queue. The reassembly coprocessor uses the free
buffer queue entries to allocate data buffers for received ATM cells during
reassembly.
One of these can be designated as the Global OAM segmentation status queue.
The host further processes these segmentation status queue entries.
of these can be designated as the Global OAM reassembly status queue. The host
further processes these reassembly status queue entries.
reassembly and segmentation functions.
The host furnishes data buffers to the reassembly processor by posting their
The following queues exist in host memory:
• Segmentation status queues (up to 32 queues)—includes the Global OAM
• Reassembly status queues (up to 32 queues)—includes the Global OAM
The CN8237 reports segmentation status to the segmentation status queues.
The CN8237 reports reassembly status to the reassembly status queues. One
The queues described above provide the control information that directs the
segmentation status queue
reassembly status queue
Mindspeed Technologies
CN8237
ATM OC-12 ServiceSAR Plus with xBR Traffic Management
RSM/SEG Queue
Segmentation Function (Memory)
Reassembly Function (Memory)
™
Global OAM
SAR Shared Memory Areas
Transmit Queues
Free Buffer Queues
Free Buffer Queue
(32)
28237-DSH-001-C
(32)
CN8237
8237_015