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PRELIMINARY
Am79C901A
HomePHY鈩?/div>
Single-Chip 1/10 Mbps Home Networking PHY
DISTINCTIVE CHARACTERISTICS
n
Fully integrated 1 Mbps HomePNA Physical
Layer (PHY) as defined by Home Phoneline
Networking Alliance (HomePNA)
specification 1.1
鈥?Optimized for home networking applications
over existing telephone wire
鈥?Media Independent Interface (MII)-compatible
for connecting external Media Access
Controller (MAC)
鈥?In-band control features:
Adjustable power and speed levels
32 bits of reserved in-band messaging piggy-
backed on Ethernet packet
鈥?Register programmable features:
Power control
Speed control
Performance registers
Optional control of Squelch algorithm
Major frame timing parameters programma-
ble: ISBI, AID ISBI, pulse width, inter-symbol
time
鈥?any1Home鈩?link detection:
Indicates to the MAC that a valid home net-
working node has been detected
Detects a network failure and allows the
upper layer protocol to take corrective action
n
Fully integrated 10 Mbps Ethernet transceiver
鈥?Comprehensive Auto-Negotiation
implementation
鈥?IEEE 802.3u-compliant MII
鈥?Full-duplex operation supported on the MII
port with independent Transmit (TX) and
Receive (RX) channels
鈥?Optimized for 10BASE-T applications
n
Compliant with HomePNA specification 1.1
n
General Purpose Serial Interface (GPSI)/Serial
Peripheral Interface (SPI)
n
Extensive programmable internal/external
loopback capabilities
n
Extensive LED status support
n
IEEE 1149.1-compliant JTAG Boundary Scan
test access port interface
n
Very low power consumption
n
+3.3 V power supply along with 5 V tolerant I/Os
enable broad system compatibility
鈥?XTAL1 supports 3.3 V I/O only
鈥?XTAL2 supports 1.0 V I/O only
n
Available in 68-pin PLCC and 80-pin TQFP
packages
n
Industrial Temperature Support (-40
潞C to +85
潞
C)
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.
The integrated HomePNA transceiver is a physical
layer device that enables data networking at speeds
up to 1 Mbps over existing residential phone wiring
regardless of topology and without disrupting
telephone (POTS) service.
The integrated Ethernet transceiver is a physical
layer device supporting the IEEE 802.3 standard for
10BASE-T. It provides all of the PHY layer functions
required to support 10 Mbps data transfer speeds.
A compliant IEEE 1149.1 JTAG test interface for
board level testing is provided. The Am79C901A
PHY also provides on-chip LED drivers for collision,
link integrity, speed, activity, and power output.
The Am79C901A PHY is fabricated in an advanced
low power 3.3 V CMOS process to provide low
operating current for power sensitive applications.
T he A m79C901A P H Y is avai lable in the
commercial temperature range (0潞C to +70潞C) in
68-pin PLCC and 80-pin TQFP packages. The
Am79C901A also suppor ts the industrial
temperature range (-40潞C to +85潞C) in the 80-pin
TQFP package. The industrial temperature range is
well suited to environments with enclosures with
restricted air flow or outdoor equipment.
Publication#
22304
Rev:
C
Amendment/0
Issue Date:
July 2000
Refer to AMD鈥檚 Website (www.amd.com) for the latest information.

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