– F_CTL contains miscellaneous frame control information, such as:
• Position of the frame in the sequence and exchange (first/last)
• Role of the frame originator (sequence initiator /recipient, exchange originator/responder)
• Number of fill bytes
DF_CTL
S_ID D_ID
F_CTL
SEQ_CNT RX_ID
The F_CTL field is a bitmap that contains miscellaneous frame control information.
For example, the F_CTL field identifies:
• Whether the frame is the first or last frame in the exchange • Whether the frame is the first or last frame in the sequence • Whether the frame was sent by the sequence initiator or recipient • Whether the frame was sent by the exchange originator or responder