ST STM32F101xx

RM0008 Ethernet (ETH): media access control (MAC) with DMA controller
Doc ID 13902 Rev 12 993/1096
Figure 355. Receive DMA operation
(Re-)Fetch next
descriptor
(AHB)
error?
No
Own bit set?
Yes
Yes
Stop RxDMAStart RxDMA Start
(AHB)
error?
No
RxDMA suspended
Yes
Frame data
available?
Wait for frame dataWrite data to buffer(s)
Yes
Yes
Fetch next descriptor
Yes
No
Frame transfer
complete?
No
Set descriptor error
Yes
Time stamp
present?
No
Close RDES0 as last
descriptor
Write time stamp to
RDES2 & RDES3
No
(AHB)
error?
Yes
Close RDES0 as
intermediate descriptor
Frame transfer
complete?
No
Flush disabled ?
No
Flush the
remaining frame
Yes
Yes
No
No
No
Yes
Yes
Poll demand/
new frame available
No
Yes
(AHB)
error?
(AHB)
error?
No
Own bit set
for next desc?
Flush
disabled?
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