Description
The Agere Systems Inc. FW801 device provides the analog physical layer functions needed to implement a one-port node in a cable-based IEEE 1394- 1995 and IEEE P1394a network.

Distinguishing Features
■ Compliant with IEEE P1394a Draft 2.0 Standard for a High Performance Serial Bus (Supplement)
■ Supports extended BIAS_HANDSHAKE time for enhanced interoperability with camcorders
■ While unpowered and connected to the bus, will not drive TPBIAS on a connected port even if receiving incoming bias voltage on that port
■ Does not require external filter capacitors for PLL
■ Does not require a separate 5 V supply for 5 V link controller interoperability
■ Interoperable across 1394 cable with 1394 physical layers (PHY) using 5 V supplies
■ Interoperable with 1394 link-layer controllers using 5 V supplies
■ Device powerdown feature to conserve energy in battery-powered applications
■ Interface to link-layer controller supports Annex J electrical isolation as well as bus-keeper isolation

Features
■ Provides one fully compliant cable port at 100 Mbits/s, 200 Mbits/s, and 400 Mbits/s
■ Fully supports Open HCI requirements
■ Supports arbitrated short bus reset to improve utilization of the bus
■ Supports ack-accelerated arbitration and fly-by concatenation
■ Supports connection debounce
■ Supports multispeed packet concatenation
■ Supports PHY pinging and remote PHY access packets
■ Fully supports suspend/resume
■ Supports PHY-link interface initialization and reset
■ Supports 1394a register set
■ Supports LPS/link-on as a part of PHY-link interface
■ Supports provisions of IEEE 1394-1995 Standard for a High Performance Serial Bus
■ Fully interoperable with FireWire† implementation of IEEE 1394-1995
■ Reports cable power fail interrupt when voltage at CPS pin falls below 7.5 V
■ Separate cable bias and driver termination voltage supply for port

Other Features
■ 48-pin TQFP package
■ Single 3.3 V supply operation
■ Data interface to link-layer controller provided through 2/4/8 parallel lines at 50 Mbits/s
■ 25 MHz crystal oscillator and PLL provide transmit/receive data at 100 Mbits/s, 200 Mbits/s, and 400 Mbits/s and link-layer controller clock at 50 MHz
■ Multiple separate package signals provided for analog and digital supplies and grounds