The µPD72850A is the 3-port physical layer LSI which complies with the P1394a draft 2.0 specifications.
The µPD72850A works up to 400 Mbps. It is an upgrade of NECs µPD72850.

FEATURES
• The Three-port Physical Layer LSI complies to IEEE P1394a draft 2.0
• Connection debounce
• Arbitration enhancements
    • Arbitrated short bus reset
    • Ack-accelerated arbitration
    • Fly-by concatenation
    • Multiple-speed packet concatenation
    • Arbitration enhancements and cycle start (controlled by the Link layer)
• Performance optimization via PHY pinging
• Priority arbitration (controlled by the Link layer)
• Data rate: 393.216 / 196.608 / 98.304 Mbps
• Compliant with Suspend/Resume function as defined in P1394a draft 2.1
• 3.3 V single power supply
• Electrical isolated Link interface
• 24.576 MHz crystal clock generation, 393.216 MHz PLL multiplying frequency
• System power management by signaling of node power class information
• Cable power monitor (CPS) is equipped
• Fully interoperable with IEEE1394 std 1394 Link (FireWireTM, i.LINKTM)
• Cable bias and terminal voltage driver supply function (for 3-port each)
• Separate digital power and analog GND
• Enable/Disable port control switch when power supply is powered on
• Support Suspend/Resume Off mode (Compliant with P1394a draft 1.3)
• Number of supported port are selectable
    • 1port, 2port, 3port. This selection is only under Suspend/Resume Off mode
• Compliant with MD8405E (FUJIFILM MICRODEVICES CO., LTD)