Fujitsu MHV2040BH, MHV2120BH, MHV2100BH, MHV2080BH manual Conceptual diagram of communication layers

Interface

5.2 Logical Interface

The host system and the device communicate with each other by sending and receiving serial data.

The host and the device have several dedicated communication layers between them. These layers have different functions, enabling communication between the different levels of layers within the host or device and between layers at the same level that link the host and device.

Figure 5.3 is a conceptual diagram of the communication layers.

Host:	Application	Device:
	layer 4
Software control		Software control
Buffer Memory		Buffer memory
DMA engine(s)		DMA engine(s)
Shadow Block Register	Transport	Block Register
	layer 3
Transport Layer		Transport Layer
	Link
Link Layer	layer 2	Link Layer
	Physical
	layer 1
Physical Layer		Physical Layer
Host located layers		Device located layers

Figure 5.3 Conceptual diagram of communication layers

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