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DESCRIPTION

The μPD98405 (NEASCOT-S20TM) is a high-performance SAR chip that performs segmentation and reassembly of ATM cells. It has a PCI bus interface, a SONET/SDH 155-Mbps framer, and a clock recovery circuit and supports an ABR function in hardware. The μPD98405 conforms to ATM Forum and has the functions of the AAL-5 SAR sublayer, ATM layer, and TC sublayer.

FEATURES

? Conforms to ATM Forum.

? Host bus interface supporting PCI bus/generic bus.

- PCI interface (5/3.3 V, 32/64 bits, 33 MHz): Conforms to PCI Specification 2.1

- Generic bus interface (5/3.3 V, 32 bits, 33 MHz)

? AAL-5 SAR sublayer, ATM layer, and TC sublayer functions

? Hardware support of AAL-5 processing

? Software support of non-AAL-5 traffic

? SONET STS-3c/SDH STM-1 155-Mbps framer function

? Clock recovery/clock synthesizer function

? Supports up to 32 K virtual channels (VCs)

? Sixteen traffic shapers for VBR for transmission scheduling

? Hardware support of CBR/VBR/ABR/UBR service

? Supports multi-cell burst transfer for transmission and reception

? MIB counter function

? Supports LAN emulation function

? Receive FIFO of 96 cells

? External PHY devices connectable: UTOPIA Level-1 interface

? 0.35-μm CMOS process, +5-/3.3-V power supply

- Bus interface +5 V: +5-/3.3-V power supply

- Bus interface +3.3 V: +3.3-V power supply

? 304-pin plastic QFP