CHAPTER 7 TRANSMISSION
Information S14769EJ1V0IF00
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Q.7.4
If a transmit queue consists of a valid packet descriptor
→
link pointer
→
blank packet descriptor sequence, to
what does the Tx queue read pointer of the transmit VC table point on completion of transmission?
A.7.4
The Tx queue read pointer points to the position of the link pointer. To start transmission by adding a packet in
this case, issue an additional Tx_Ready command to the position of the blank packet descriptor.
Tx queue read pointer on
completion of transmission
Transmit queue
Link pointer
Blank PD
Valid PD
A new packet is added at
this position
Reference:
µ
PD98409 User’s Manual 5.4.2 Structure of transmit data
Q.7.5
Can a packet be added during transmission when the transmit VC is active?
A.7.5
Yes. Add a new packet at the position of the blank packet descriptor of that transmit queue and issue the
Tx_Ready command.
Reference:
µ
PD98409 User’s Manual 5.4.3 (3) Status transition of transmit channel
