Fujitsu MBA3147RC Manuale Utente

86 

C141-C013 

The drive checks for duplication of tags between multiple TASK frames or 
between a COMMAND frame and a TASK frame. 

If a tag is found to be duplicated in the INIT, the drive sends the ACK 
primitive to temporarily close the connection.  Then the drive reports the 
RESPONSE CODE of the OVERLAPPED TAG ATTEMPTED (0x0A). 

• 

CRC field 

When a CRC error is detected, the drive sends the NAK primitive, and 
discards the TASK frame. 

• 

Frame length 

When the IU length is other than 28 bytes, the drive reports INVALID 
FRAME (Response Code=0x02). 

• 

LOGICAL UNIT NUMBER field 

If this field is other than zero, the drive sets the response code to INVALID 
LOGICAL UNIT NUMBER (0x09), and sends the RESPONSE frame of 
RESPONSE DATA. 

• 

TASK MANAGEMENT FUNCTION field 

If this field is other than ABORT TASK, ABORT TASK SET, CLEAR 
TASK SET, LOGICAL UNIT RESET, or QUERY TASK, the drive sets the 
response code to TASK MANAGEMENT FUNCTION NOT SUPPORTED 
(0x04), and sends the RESPONSE frame of RESPONSE DATA. 

Table 1.38 defines the transfer ready IU. The XFER_RDY frame is sent by an 
SSP TARG port to request write data from the SSP INIT port.  

Bit 

Byte 

7 

6 

5 

4 

3 

2 

1 

0 

0 

(MSB) 

 

3 

 

REQUESTED OFFSET 

(LSB) 

4 

(MSB) 

 

7 

 

WRITE DATA LENGTH 

(LSB) 

8 

 

 

11 

 

Reserved 

 

 

The REQUESTED OFFSET field contains the application client buffer offset of 
the segment of write data that is sent to the SSP (initiator port as a logical unit).  
The requested offset is a multiple of four (i.e., each DATA frame begins 
transferring data on a dword boundary).  The REQUESTED OFFSET field is 
always zero for the first XFER_RDY frame of a command (drives do not support 
the ENABLE FIRST BURST field of the COMMAND frame).