Fujitsu MHV2060BH, MHV2100BH manual DMA Setup Device to Host or Host to Device Bidirectional, Tag

Models: MHV2100BH MHV2040BH MHV2060BH MHV2080BH

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5.2 Logical Interface

The host uses the DMA Active - Device to Host FIS layout. This FIS instructs the host to continue transferring DMA data from the host to the device.

5.2.3.5 DMA Setup - Device to Host or Host to Device (Bidirectional)

The DMA Setup - Device to Host or Host to Device FIS has the following layout:

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A

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FIS Type (41h)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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3

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DMA Buffer Offset

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DMA Transfer Count

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Reserved (0)

Figure 5.7 DMA Setup - Device to Host or Host to Device FIS layout

The DMA Setup - Device to Host or Host to Device FIS communicates the start of a first-party DMA access to the host system. This FIS is used to request the host system or device to set up the DMA controller before the start of a DMA data transfer.

A - Auto Active bit. If this bit is cleared ("0" is set for the bit), it indicates that a DMA Active FIS transfer is required before a Data FIS transfer.

D - Direction bit. If this bit is set ("1" is set for the bit), it indicates that the data transfer direction is from the device to the host system.

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Fujitsu MHV2060BH, MHV2100BH, MHV2080BH, MHV2040BH manual DMA Setup Device to Host or Host to Device Bidirectional, Tag