Fujitsu MHV2120BH User Manual

 

5-154 

C141-E224 

An outline of this protocol is as follows: 

1)  The device receives a PIO data-out command with the RegHD FIS. 

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

sends the RegDH FIS with 1 set in the I bit. 

3)  When the device is ready to receive data, it sets 0 in the BSY bit and 1 in the 

DRQ bit of the Status field of the PIO Setup FIS.  At this time, the device sets 
0 in the I bit of the Status field of the PIO Setup FIS for a data transfer to the 
first sector, while it sets 1 in the I bit for a data transfer to any sector other 
than the first sector.  Then, it sends this FIS to the host.  In the E_Status field, 
the device sets 1 in the BSY bit and 0 in the DRQ bit. 

4)  The device receives the DATA FIS from the host. 

5)  When all data has been transferred, the device sends the RegDH FIS (with 1 

set in the I bit) to complete execution of the command.  If the device has an 
error, it reports the error.  If any data remains to be received by the device, 
this protocol is repeated starting from step 3).  (The maximum data size is 8 
KB.) 

RegHD 

PIO Setup

DATA 

RegDH