ATM SAR for CPE products

Jennic’s SAR-CPE provides a high performance, efficient implementation of an ATM segmentation and re-assembly function for Customer Premises Equipment, particularly ADSL modems, routers and home gateways. The SAR-CPE is implemented as pre-configured compact hardware module, to enable rapid development of highly integrated System-on-Chip products for the consumer market.

The hardware accelerator based architecture minimises the processing load and system power required to support ATM on a high throughput network link. The SAR-CPE will operate at full-duplex data rates of up to 155Mbps on a system clock speed as low as 40MHz. It can support AAL5 and AAL0 for all PDU types at full line-rate, with ‘per VC’ priority and traffic shaping for CBR, VBR and UBR service classes.

The J-SAR-CPE is an implementation of Jennic’s Modular SAR product family, a range of highly configurable hardware ATM segmentation and re-assembly engines, which operate at full-duplex data rates of up to 622Mbps. The SAR architecture includes support for real-time data interfaces which bypass the host processor, for delivery of real-time data e.g. voice and video. These are mapped to ATM using the AAL2 and AAL1 protocol processors.

Block Diagram

Features

• Up to 155Mbps full duplex operation
• Support for 16 Virtual Circuits
• PCI, IBM PLB4, AHB Host interface options
• Support for AAL5 and AAL0 raw cell
• Cell header and AAL-5 trailer generation and termination.
• No external memory requirement.
• Traffic shaping for VBR, CBR, or UBR
• Calendar based transmit traffic scheduler
• Traffic parameters assigned on a per-circuit basis
• Simultaneous full line-rate transmit and receive processing.
• Technology independent hardware implementation
• UTOPIA-2 Master interface
• Integrated DMA controller
• Fully synthesisable module
• Architecture supports all PDU types.
• Conforms to ATM-Forum and ITU-T specifications

Benefits

• Low power, low silicon area design.
• Flexible high-performance architecture optimised for consumer network access applications.

Options

• Custom configurations are also available