DESCRIPTION
The µPD98404 NEASCOT-P30TM is an LSI for ATM applications, which can be used in ATM adapter boards for connecting PCs or workstations to an ATM network and can also be used in ATM hubs and ATM switches. This LSI provides the TC sub-layer functions in the SONET/SDH-base physical layer within the ATM protocol defined by the ATM Forum’s UNI3.1 recommendations.

FEATURES
• On-chip clock recovery/clock synthesis functions
• Provides TC sub-layer function for the ATM protocol’s physical layer
• Supported frame formats include 155 Mbps SONET STS-3c/SDH STM-1
• Conforms to ATM Forum UTOPIA interface Level 2 V1.0 (af-phy-0039.000 June 1995)
   Supports three UTOPIA interfaces:
   • Single PHY octet-level handshaking
   • Single PHY cell-level handshaking
   • Multi PHY mode
• Selectable to drop/bypass unassigned cells
• On-chip internal loopback functions for PMD layer loopback and ATM layer loopback
• Supports two PMD interfaces: serial and parallel
   • 155.52 Mbps serial interface
   • 19.44 MHz parallel interface
• Provides registers for writing/reading overhead information
   SOH (section overhead) :J0 byte, Z0 (first and second) bytes, F1 byte
   LOH (line overhead) :K1 byte, K2 byte
   POH (path overhead) :F2 byte, C2 byte, H4 byte
• Provides pseudo error frame transmit function for various errors
• Supports JTAG boundary scan test function (IEEE 1149.1)
• CMOS technology
• +3.3 V single power supply