FireWire Link Layer Interface Transmit Section

Physical

Layer

400 MHz

FireWire

Receive

50 MHz

Link Layer Interface

Transmit

8

Application

Interface

CRC

Cycle

Start

Core

State

Machine

FIFOs

Request/

Data

PHY

Interface

• Physical layer operates at full 400 MHz data transfer rate

  • serial-to-parallel conversion drops data rate to 50 MHz for back-end link layer

• Link Layer includes CRC generation and FIFOs

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