General Description
Designed to meet the challenges of high bandwidth telecommunication line aggregation devices, and offering an industry-leading 2048 channels, the VSC9680 is the HDLC controller and ATM cell delineation device in Vitesse’ TimeStream™ product family.

FEATUREs:
• 2048 full duplex HDLC channels
• 3 full duplex DS3 or HSSI channels
• 16 HDSL and 8 ADSL channels
• 28 T1 or 32 E1 channels
• Up to 84 T1 or 63 E1 channels via a proprietary interface to the VSC967x Framer product family
• Combined throughput up to 135 Mbps
• Delineates HDLC packets or ATM cells per logical channel
• Flexible and powerful mapping of DS0 physical to logical channels
• HDLC flag insertion, bit stuffing, CRC-16/32 generation for each transmit channel
• HDLC flag detection, bit destuffing and CRC-16/32 calculation for each receive channel
• Detects a valid ATM cell by framing to the HEC in the receive direction, and inserts an HEC value for each ATM cell in the transmit direction.
• 2048 channel scatter gather DMA engine transfers packets to and from host memory using a flexible descriptor structure
• External ZBT SRAM allows large burst transfers providing efficient PCI bus utilization.
• 32/64-bit 33/66 MHz PCI V2.1 compliant bus interface for system configuration and packet transfers
• Utopia Level 2 compliant bus interface for ATM cell transfers
• Seamless interface to Vitesse’ VSC9670 and VSC9675 Framers
• IEEE 1149.1 JTAG boundary scan
• 3.3V CMOS with 5V tolerant I/O
• 388-pin PBGA Packaging

APPLICATIONs:
• ATM & Frame Relay Switches
• Universal Access Concentrators
• xDSL Access Multiplexors
• Routers
• Wireless Base Station Controllers