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The volume of data which can be received is called the Burst length, and the data pointer is
called the Relative Offset.
If multiple FCP_XFER_RDY frames are sent during 1 exchange, the Relative Offset is added
to the Burst length, and is incremented continuously.
(5)
Transfer of Odd-numbered Bytes
On the FC loop, since the smallest unit is 4 bytes, transfer of odd numbers of bytes cannot be
done. For that reason, through the Fill Byte function, which defines bit 1 and bit 0 of the
F_CTL field of the frame header, the effective data transferred is shown and odd-numbered
bytes are transferred.
Operations when the Fill Byte is specified are shown below.
bit 1
0
0
0
0
1
1
0
1
1
2.3.2
Command link
Not supported.
2 - 14
No filled byte.
1-byte fill is performed. Therefore, three bytes of effective data are
transferred.
2-byte fill is performed. Therefore, two bytes of effective data are
transferred.
3-byte fill is performed. Therefore, one byte of effective data is transferred.
C141-E054-02EN
Meaning
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