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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
899 of 1441
NXP Semiconductors
UM10503
Chapter 28: LPC43xx/LPC43Sxx Ethernet
12
LE
Length Error
When set, this bit indicates that the actual length of the frame received and
that the Length/ Type field does not match. This bit is valid only when the
Frame Type (RDES0[5]) bit is reset.
13
SAF
Source Address Filter Fail
When set, this bit indicates that the SA field of frame failed the SA Filter in the
MAC Core.
14
DE
Descriptor Error
When set, this bit indicates a frame truncation caused by a frame that does not
fit within the current descriptor buffers, and that the DMA does not own the
Next Descriptor. The frame is truncated. This field is valid only when the Last
Descriptor (RDES0[8]) is set.
15
ES
ES: Error Summary
Indicates the logical OR of the following bits:
• RDES0[1]: CRC Error
• RDES0[3]: Receive Error
• RDES0[4]: Watchdog Timeout
• RDES0[6]: Late Collision
• RDES0[7]: Giant Frame
• RDES4[4:3]: IP Header/Payload Error
• RDES0[11]: Overflow Error
• RDES0[14]: Descriptor Error
This field is valid only when the Last Descriptor (RDES0[8]) is set.
29:16
FL
Frame Length
These bits indicate the byte length of the received frame that was transferred
to host memory (including CRC). This field is valid when Last Descriptor
(RDES0[8]) is set and either the Descriptor Error (RDES0[14]) or Overflow
Error bits are reset. This field is valid when Last Descriptor (RDES0[8]) is set.
When the Last Descriptor and Error Summary bits are not set, this field
indicates the accumulated number of bytes that have been transferred for the
current frame.
30
AFM
Destination Address Filter Fail
When set, this bit indicates a frame that failed in the DA Filter in the MAC
Core.
31
OWN
Own Bit
When set, this bit indicates that the descriptor is owned by the DMA of the
MAC Subsystem. When this bit is reset, this bit indicates that the descriptor is
owned by the Host. The DMA clears this bit either when it completes the frame
reception or when the buffers that are associated with this descriptor are full.
Table 660. Receive descriptor fields 0 (RDES0)
Bit
Symbol
Description