Fujitsu MJA2500BH Maintenance Manual - Page 90
DMA Active - Device to Host FIS layout
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Interface 5.2.3.3 Register - Device to Host The Register - Device to Host FIS has the following layout: 33222222222211111111119876543210 1098765432109876543210 Error 0 Status R I R Reserved (0) FIS Type (34h) Device 1 LBA High LBA Mid LBA Low Reserved (0) 2 LBA High (exp) LBA Mid (exp) LBA Low (exp) (0) Reserved (0) 3 Reserved (0) Sector Count (exp) Sector Count Reserved (0) 4 Reserved (0) Reserved (0) Reserved (0) Figure 5.5 Register - Device to Host FIS layout The Register - Device to Host FIS is used when information concerning the Shadow Register Block in the host adapter is updated. This FIS indicates that the device has completed a command operation. Furthermore, this is a mechanism for changing information concerning the Shadow Register Block of the host adapter. I - If this bit is set, an interrupt request is issued to the host system. 5.2.3.4 DMA Active - Device to Host The DMA Active - Device to Host FIS has the following layout: 33222222222211111111119876543210 1098765432109876543210 0 Reserved (0) Reserved (0) R R R Reserved (0) FIS Type (39h) Figure 5.6 DMA Active - Device to Host FIS layout 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. 5-16 C141-E293