Fujitsu (Fujitsu Microelectronics Europe ) : MB 86687

Adaption Layer Controller ALC

The MB86687 is an ATM protocol controller which autonomously terminates ATM Adaptation Layer standards Type 3/4 and Type 5. Streaming and message modes as defined for AAL 3/4 and AAL5 are supported. User data packets are transferred to and from shared data structure memory via a high speed intelligent DMA controller with a 32 bit data Bus. The device supports simultaneous segmentation and reassembly on up to 1024 virtual circuits (VCs). Shared data structures are stored in SAR memory which can be either dual-port or a partition of system memory. Segmentation packets and packets being reassembled may also be stored in dual-port memory. In addition external data structures are also stored in SAR memory and may be accessed via the DMA controller. In non-demanding applications, system memory can be used as SAR memory. The ALC device supports two transparent modes. In transparent payload mode the 48 byte ATM cell payload is received or transmitted transparently into or from SAR memory. In transparent cell mode the ATM cell is received or transmitted transparently into or from SAR memory. Other features include:

• Support for up to 12 peak segmentation rates with sub-ratios of 0.5 and 0.25 of peak
• rates selectable on a per-VC basis
• Programmable peak and average rates with leaky-bucket averaging on total ALC
• cell stream output.
• UTOPIA v2.01 Compatible cell stream interface with optional HEC checking on receive and HEC octet disabled modes
• Flexible routing tag append / remove mode for direct ATM Switch connection
• Supports Intel and Motorola modes, including line transfers (i.e. single cycle bursts)
• Internal cache to store header info and traffic parameters for up to 128 VCs
• Packaged in 208-pin plastic quad flat pack
• JTAG complient

System Configurations

Technology:	unknown
Package:	PQFP 208 Pin