IDT77252

The IDT77252 NICStAR™ is a member of IDT's family of products for Asynchronous Transfer Mode (ATM) networks. The ABR SAR performs both the ATM Adaptation Layer (AAL) Segmentation and Reassembly (SAR) function and the ATM layer protocol functions.

A Network Interface Card (NIC)IDT77252 or internetworking product based on the ABR SAR uses host memory, rather than local memory, to reassemble Convergence Sublayer Protocol Data Units (CS-PDUs) from ATM cell payloads received from the network. When transmitting, as CSPDUs become ready, IDT77252 are queued in host memory and segmentedby the ABR SAR into ATM cell payloads. From this, the ABR SAR then creates complete 53-byte ATM cells which are sent through the network. The ABR SAR's on-chip PCI bus master interface provides efficient, low latency DMA transfers with the host system, while IDT77252 UTOPIA interface provides direct connection to PHY components used in 25.6 Mbps to 155 Mbps ATM networks.
The IDT77252 is fabricated using state-of-the-art CMOS technology, providing the highest levels of integration, performance and reliability, with the low-power consumption characteristics of CMOS.