The TNETE2008 OctalPHY is a physical-layer (PHY) interface device for up to eight 10BASE-T networks using a multiplexed medium access controller (MAC) interface compatible with TNETX3110, TNETX3151, TNETX3190, or TNETX3270 switch devices, or equivalent. A digital-signal-processor (DSP)-based phase-locked loop (PLL) is used on each channel to recover data. Integrated wave shaping of the output eliminates the need for filters to meet electromagnetic interference (EMI) testing. DSP-based wave-shaping techniques used internally reduce the required number of external components to a coupling transformer, four resistors, and a capacitor per channel. The multiplexed host interface reduces the number of terminals required to connect eight networks to eight MAC engines, allowing the use of a single package. The TNETE2008 operation is fully automatic. It can be taken from reset to full operation without parameter downloads or interaction with a host central processing unit (CPU). Some mode terminals affect all of the ports, such as looping back transmit data to the receive path, powering down the PHY, and setting the receiver threshold. There are no management interfaces or internal registers on this device. A directly driven LED matrix provides EthernetTM status indicators, i.e., link, activity, collision, and duplex. The TNETE2008 produces and receives IEEE Std 802.3-compliant waveforms when coupled to the network with a suitable transformer. The TNETE2008 also incorporates a JTAG-compliant test port. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. IEEE Std 1149.1-1990, IEEE Standard Test-Access Port and Boundary-Scan Architecture Ethernet is a trademark of Xerox Corporation. Copyright 1998, Texas Instruments Incorporated