FEC Registers—MBAR + 0x3000
MPC5200B Users Guide, Rev. 1
Freescale Semiconductor 14-13
R Reserved
W
Bits Name Description
0 HBERR Heartbeat Error— interrupt bit indicates HBC is set in the X_CNTRL register and COL
input was not asserted within the heartbeat window following a transmission.
1 BABR Babbling Receive Error—bit indicates frame was received with a length in excess of
R_CNTRL.MAX_FL bytes.
2 BABT Babbling Transmit Error—bit indicates transmitted frame length exceeded
R_CNTRL.MAX_FL bytes. This condition is usually caused by a frame that is too long
being placed into the transmit data buffer(s).
Truncation does not occur.
3 GRA Graceful Stop Complete—interrupt bit is asserted for one of three reasons.
1 = A graceful stop initiated by setting X_CNTRL.GTS bit is complete.
2 = A graceful stop initiated by setting X_CNTRL.FC_PAUSE bit is complete.
3 = A graceful stop initiated by reception of a valid full duplex flow control “pause”
frame is complete. Refer to “Full-Duplex Flow Control” section of the Ethernet
Operation chapter.
A "graceful stop" means the transmitter is put into a pause state after completion of
the frame currently being transmitted.
4 TFINT Transmit frame interrupt. This bit indicates that a frame has been transmitted.
5—Reserved
6—Reserved
7—Reserved
8 MII MII Interrupt—bit indicates MII completed the data transfer requested.
9—Reserved
10 LATE_COL Late Collision bit indicates a collision occurred beyond the collision window (slot time)
in half-duplex mode. The frame is truncated with a bad CRC. Remainder of the frame
is discarded.
11 COL_RETRY_LIM Collision Retry Limit—bit indicates a collision occurred on each of 16 successive
attempts to transmit the frame. The frame is discarded without being transmitted and
transmission of the next frame begins.
Only occurs in half-duplex mode.
12 XFIFO_UN Transmit FIFO Underrun—bit indicates the transmit FIFO became empty before the
complete frame was transmitted. A bad CRC is appended to the frame fragment and
remainder of frame is discarded.
13 XFIFO_ERROR Transmit FIFO Error—indicates an error occurred within the transmit FIFO. When
XFIFO_ERROR bit is set, ECNTRL.ETHER_EN is cleared, halting FEC frame
processing. When this occurs, software must ensure both the FIFO Controller and
BestComm are soft-reset.
14 RFIFO_ERROR Receive FIFO Error—indicates error occurred within the RX FIFO. When
RFIFO_ERROR bit is set, ECNTRL.ETHER_EN is cleared, halting FEC frame
processing. When this occurs, software must ensure both the FIFO Controller and
BestComm are soft-reset.
15:31 — Reserved.
RESET:0 00000000 0 0 0 00 0 0
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