Fujitsu MBA3073RC, MBC2036RC, MBC2073RC, MBA3300RC, MBA3147RC specifications SAS Interface

Models: MBA3300RC MBA3147RC MBA3073RC MBC2073RC MBC2036RC

1 439
Download 439 pages 37.87 Kb
Page 94
Image 94

SAS Interface

The initial read DATA frame for a given command shall set the DATA OFFSET field to zero. If any additional read DATA frames are required, the DATA OFFSET field shall be set to the value of the previous read DATA frame's data offset plus the previous read DATA frame's data length.

The initial write DATA frame for a given command shall set the DATA OFFSET field to zero. If any additional write DATA frames are required, the DATA OFFSET field shall be set to the value of the previous write DATA frame's data offset plus the previous write DATA frame's data length.

When a drive receives a write DATA frame, the following items are checked:

HASHED DESTINATION SAS ADDRESS field

When this field contains a value different from the Hashed SAS address of the drive, the drive sends the ACK and CREDIT_BLOCKED primitives, and discards the DATA frame.

HASHED SOURCE SAS ADDRESS field

When this field contains a value different from the SOURCE SAS ADDRESS field of the OPEN frame, the drive sends the CREDIT_BLOCKED primitive, and discards the DATA frame.

CRC field

When a CRC error is detected, the drive sends the NAK primitive, and discards the DATA frame. At this time, the SENSE DATA for INFORMATION UNIT iuCRC ERROR DETECTED is reported.

Frame length

When the IU length is greater than 1024 bytes, the drive discards the DATA frame. At this time, the SENSE DATA for INFORMATION UNIT TOO LONG is reported.

TAG field

When a DATA frame in which the same value as that set in the TARGET PORT TRANSFER TAG field of the XFER_RDY frame is received, but the tag is different from the one of the XFER_RDY frame, the drive sends the ACK primitive and CREDIT_BLOCKED primitive, and discards the DATA frame.

TARGET PORT TRANSFER TAG (TPTT) field

When a DATA frame with the TPTT field that does not match with the TPTT field of the XFER_RDY frame is received, the drive sends the ACK primitive and CREDIT_BLOCKED primitive, and discards the DATA frame. At this time, after temporarily closing the connection, the drive re-opens a connection and sends the SENSE DATA for INVALID TARGET PORT TRANSFER TAG RECEIVED.

90

C141-C013

Page 94
Image 94
Fujitsu MBA3073RC, MBC2036RC, MBC2073RC, MBA3300RC, MBA3147RC specifications SAS Interface