IEEE1394.1995 Layers

• Transaction Layer (Hardware & Software)
  • Read, Write, and Lock
  • Unified, Split, and Concatenated
  • Shared Memory model

• Link Layer (Hardware)
  • Isochronous Subactions
    • Broadcast, or Multicast
    • Nominal 125 µSec Cycle Period
  • Asynchronous Subactions
    • Max packet size 512, 1024, 2048 for S100, S200, S400
    • Explicit Destination, Acknowledge
    • Fairness Interval for Equal Access

• Physical Layer (Hardware)
  • 100 Mbps, 200 Mbps, 400 Mbps for
    S100, S200, S400
  • Point-to-Point , 4.5m/Link, 16 Hops max
  • Common Mode Voltage/Current Signaling
  • 8-40 VDC @ up to 1.5A on Cable

Physical Layer

Link Layer

Transaction Layer

Isochronous Service

Asynchronous Service

6 Conductor Cable

(4 Signal & 2 Power)

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