COM20020D Datasheet, PDF (12/72 Pages) SMSC Corporation – ULANC Revision D Universal Local Area Network Controller with 2K x 8 On-Board RAM

Acknowledgements
An Acknowledgement is used to acknowledge
reception of a packet or as an affirmative
response to FREE BUFFER ENQUIRIES and is
sent by the following sequence:
• An ALERT BURST
• An ACK (ACKnowledgement--ASCII code
86H) character
ALERT BURST
ACK
Negative Acknowledgements
A Negative Acknowledgement is used as a
negative response to FREE BUFFER
ENQUIRIES and is sent by the following
sequence:
• An ALERT BURST
• A NAK (Negative Acknowledgement--ASCII
code 15H) character
ALERT BURST
NAK
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