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391
Ethernet Communication Module
RX_A Buffer Descriptor Pointer Offset register
Address: A060 0A28
D07:00 R TXERBD 0x00 Contains the pointer (in the TX buffer descriptor RAM) to
the last buffer descriptor of a frame that was not
successfully transmitted. TXERBD is loaded by the
TX_WR logic when a transmit frame is aborted by the
MAC or when the MAC finds a CRC error in a frame.
TXERBD also is loaded if a buffer descriptor that is not
the first buffer descriptor in a frame does not have its F bit
set.
Note: This pointer is the 8-bit physical address of the
TX buffer descriptor RAM, and points to the
first location of the four-location buffer
descriptor. The byte offset of this buffer
descriptor can be calculated by multiplying this
value by 4.
Note: Software uses TXERBD to identify frames that
were not transmitted successfully.
Bits Access Mnemonic Reset Description
Table 244: TX Error Buffer Descriptor Pointer register
Reserved
RXAOFF
13121110987654321015 14
31 29 28 27 26 25 24 23 22 21 20 19 18 17 1630
Reserved