Communication Layers - Fujitsu MHW2040BS Product Manual

5.2.1 Communication layers

Each of the layers is outlined below.
Physical layer
Detects, sends, and receives band signals.
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Sends serial data to and receives it from the link layer.
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Link layer
Negotiates against mutual transfer requests between the host system and
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device.
Encodes serial data as 10- or 8-bit data, then converts it into DWORD data.
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Inserts auxiliary signals (SOF, CRC, and EOF), deletes auxiliary signals, and
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communicates with the transport and physical layers.
Transport layer
Exchanges data in communication with the link layer, and builds the frame
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information structure (FIS).
Contains a (Shadow) Block Register.
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Reflects the FIS contents to the Block Register.
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C141-E249
5.2 Logical Interface
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