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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
885 of 1441
NXP Semiconductors
UM10503
Chapter 28: LPC43xx/LPC43Sxx Ethernet
Fig 86. TxDMA operation in OSF mode
Previous frame
status available
Start TxDMA
(Re-)fetch next
descriptor
Write status word to
prev. frame’s TDES0
Transfer data from
buffer(s)
(AHB)
error?
Own
bit set?
(AHB)
error?
Frame xfer
complete?
Time stamp
present?
(AHB)
error?
Write time stamp to
TDES2 & TDES3
for previous frame
(AHB)
error?
Stop TxDMA
No
Yes
No
Yes
No
Start
Yes
Close intermediate
descriptor
No
No
Wait for previous
frame’s Tx status
Second
frame?
Yes
Yes
No
Yes
Yes
Write time stamp to
TDES2 & TDES3
for previous frame
(AHB)
error?
(AHB)
error?
Yes
Time stamp
present?
Yes
Write status word to
prev. frame’s TDES0
TxDMA suspended
Yes
No
Yes
No
No
Poll
demand
No
No