Fujitsu MHT2060BH Manual Do Utilizador

 

5-146 C141-E203-01EN 

DMA data-in commands include the following commands: 

• 

READ DMA (EXT) 

• 

IDENTFY DMA 

The DMA mechanism transfers data of more than one block from the device to the 
host.  The completion of a command is reported by an interruption. 

An outline of this protocol is as follows: 

1)  The device receives a DMA data-in command with the Register HD FIS. 

2)  If an error remaining in the device prevents command execution, the device 

sends the Register DH FIS with 1 set in the I bit. 

3)  When the device is ready to send data, it sends the Data FIS to the host. 

4)  When all data has been transferred, the device sends the Register DH FIS 

(with 1 set in the I bit) to complete execution of the command.  If any data 
remains to be sent by the device, this protocol is repeated starting from step 3).  
(The maximum data size is 8 KB.) 

 

RegHD 

DATA 

RegDH