CN8236EBGB Mindspeed Technologies, CN8236EBGB Datasheet - Page 69
CN8236EBGB
Manufacturer Part Number
CN8236EBGB
Description
ATM SAR 155Mbps 3.3V ABR/CBR/GFR/UBR/VBR 388-Pin BGA
Manufacturer
Mindspeed Technologies
Datasheet
1.CN8236EBGB.pdf
(443 pages)
Specifications of CN8236EBGB
Package
388BGA
Traffic Class
ABR|CBR|GFR|UBR|VBR
Utopia Type
Level 1|Level 2
Host Interface
PCI
Maximum Data Rate
155 Mbps
Typical Operating Supply Voltage
3.3 V
Minimum Operating Supply Voltage
3 V
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28236-DSH-001-B
3.0 Host Interface
3.1 Overview
The CN8236 segments and reassembles user data packets at 200 Mbps simplex,
and over 155 Mbps full duplex. The actual segmentation and reassembly
processes execute without run-time host control. However, the ATM host system
supplies the data for transmission and buffers for received data. In addition to this
control, the host processes status returned from the SAR. To take advantage of the
CN8236’s high throughput, the host must process control and status information
at a comparable rate.
performance requirements on the host system. High throughput systems require
large numbers of processing cycles and efficient use of system buses.
architecture. With this interface, the CN8236 facilitates a scalable, distributed
host system. The interface also minimizes the impact of an ATM port on the host
system’s PCI bus.
APPLICATION EXAMPLE
An Ethernet Switch uses a CN8236-based subsystem as an uplink to an
OC-3 ATM backbone. Under worst case conditions, Ethernet packets
(64 octets) map into two ATM cells. At OC-3 rates, the CN8236 converts
176.6 K packets/second (Kpps) to cells in each direction. Therefore, the
host must process control and status information for a total of 353.2 Kpps.
This packet rate equates to a packet service time of 2.83 µs/packet.
In cases such as the example above, the service rate places extraordinary
The CN8236 provides a flexible, high-performance, host interface
Mindspeed Technologies
3
™
3-1
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