Ethernet MAC
UG0331 User Guide Revision 15.0 419
Table 391 • RXUO
Bit Number Name Reset Value Description
[31:12] Reserved 0x0 Reserved
[11:0] RXUO 0x0 Receive unknown OP code counter: Incremented each time a MAC
control frame containing an op code other than a PAUSE is
received.
Table 392 • RALN
Bit Number Name Reset Value Description
[31:12] Reserved 0x0 Reserved
[11:0] RALN 0x0 Receive alignment error counter: Incremented for each received
frame from 64 to 1518.This contains an invalid FCS and is not an
integral number of bytes.
Table 393 • RFLR
Bit Number Name Reset Value Description
[31:16] Reserved 0x0 Reserved
[15:0] RFLR 0x0 Receive frame length error counter: Incremented for each frame
received in which the 802.3 length field does not match with the
number of the data bytes actually received (46-1500 bytes).
The counter is not incremented if the length field is not a valid 802.3
length.
Table 394 • RCDE
Bit Number Name Reset Value Description
[31:12] Reserved 0x0 Reserved
[11:0] RCDE 0x0 Receive code error counter: Incremented each time a valid carrier
is present and at least one invalid data symbol is detected.
Table 395 • RCSE
Bit Number Name Reset Value Description
[31:12] Reserved 0x0 Reserved
[11:0] RCSE 0x0 Receive false carrier counter: Incremented each time a false carrier
is detected during idle, as defined by a 1 on RX_ER, and an ‘0xE’
on RXD. The event is reported along with the statistics generated
on the next received frame. Only one false carrier condition can be
detected and logged between frames.
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