GENERAL DESCRIPTION
The Am79C901A HomePHY is a single-chip device that contains both a physical layer (PHY) for 1 Mbps data networking over existing residential telephone wiring based on the specification published by HomePNA and a physical layer for supporting the IEEE 802.3 standard for 10BASE-T. The HomePHY is targeted at embedded applications and has both GPSI and MII-compatible interfaces.

DISTINCTIVE CHARACTERISTICS
■ Fully integrated 1 Mbps HomePNA Physical Layer (PHY) as defined by Home Phoneline Networking Alliance (HomePNA) specification 1.1
    — Optimized for home networking applications over existing telephone wire
    — Media Independent Interface (MII)-compatible for connecting external Media Access Controller (MAC)
    — In-band control features: Adjustable power and speed levels 32 bits of reserved in-band messaging piggybacked on Ethernet packet
    — Register programmable features: Power control Speed control Performance registers Optional control of Squelch algorithm Major frame timing parameters programmable: ISBI, AID ISBI, pulse width, inter-symbol time
    — any1Home™ link detection: Indicates to the MAC that a valid home networking node has been detected Detects a network failure and allows the upper layer protocol to take corrective action
■ Fully integrated 10 Mbps Ethernet transceiver
    — Comprehensive Auto-Negotiation implementation
    — IEEE 802.3u-compliant MII
    — Full-duplex operation supported on the MII port with independent Transmit (TX) and Receive (RX) channels
    — Optimized for 10BASE-T applications
■ Compliant with HomePNA specification 1.1
■ General Purpose Serial Interface (GPSI)/Serial Peripheral Interface (SPI)
■ Extensive programmable internal/external loopback capabilities
■ Extensive LED status support
■ IEEE 1149.1-compliant JTAG Boundary Scan test access port interface
■ Very low power consumption
■ +3.3 V power supply along with 5 V tolerant I/Os enable broad system compatibility
    — XTAL1 supports 3.3 V I/O only
    — XTAL2 supports 1.0 V I/O only
■ Available in 68-pin PLCC and 80-pin TQFP packages
■ Industrial Temperature Support (-40ºC to +85ºC)