Datasheet

2.3 Outline of Command Processing
C141-C008 2-15
(4) Write related command operations
During write related command operations, before receiving of data, the INIT is
notified in the FCP_XFER_RDY frame of the volume of data which the device
can receive and the pointer for those data.
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.
Table 2.7 Fill byte
bit 1 bit 0 Meaning
0 0 No filled byte.
0 1 1-byte fill is performed. Therefore, three bytes of effective data are transferred.
1 0 2-byte fill is performed. Therefore, two bytes of effective data are transferred.
1 1 3-byte fill is performed. Therefore, one byte of effective data is transferred.
2.3.2 Command link
Not supported.