Datasheet

2.3 Outline of Command Processing
C141-C008 2-11
c. Frame transfer
The transfer source device, by receiving the R_RDY primitive, can judge that
it is possible for the transfer destination device to receive frames, so, it can
send frames.
Since one frame can be output for one R_RDY primitive, when wanting to
send 2 or more frames, after 1 frame is sent, the transfer source device must
wait until another R_RDY primitive is sent from the transfer destination
device.
However, if the buffer is not empty and it is impossible for the transfer
destination device to receive data, the CLS primitive is sent.
At this time, the CLS primitive is resent and loop use rights are released.
Furthermore, after this IDD receives a normal OPN primitive, it sends four
R_RDY primitives (that is, it is possible for the transfer source device to send
four frames).
A frame is sandwiched between a SOF (Start of Frame delimiter) primitive
and an EOF (End of Frame delimiter) primitive.
The SOF primitives and EOF primitives supported by this IDD are as shown
below.
− SOFi3: SOF of starting frame
− SOFn3: SOF of continuing frames
− EOFn: EOF of continuing frames
− EOFt: EOF of final frame
SOFi3 Frame EOFt
SOFi3 Frame EOFn SOFn3 Frame EOFt
SOFi3 Frame EOFn SOFn3 Frame EOFn SOFn3 Frame EOFt
Figure 2.3 Combination of SOF and EOF primitives used for transferring frames