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MOTOROLA Chapter 6. Programming Model 6-9
PRELIMINARYÑSUBJECT TO CHANGE WITHOUT NOTICE
and RFINT to notify at the end of frame.
6.2.10 Ethernet Interrupt Vector Register (IVEC)
The Ethernet interrupt vector register (IVEC), shown in Table 6-11, indicates the class of
interrupt generated by the FEC (IVEC) and provides control of the interrupt level
(ILEVEL).
Table 6-10. I_EVENT/I_MASK Field Descriptions
Bits Name Description
0 HBERR Heartbeat error. When I_EVENT[HBC] is set, this interrupt indicates that heartbeat was not
detected within the heartbeat window following a transmission.
1 BABR Babbling receive error. Indicates a received frame exceeded MAX_FRAME_LENGTH bytes. The
hardware truncates receive frames exceeding 2047 bytes so as not to overßow receive buffers.
Note that the Þrst revision of the MPC860T (mask #H56S) must not be given frames in excess of
2047 as it does not truncate frames.
2 BABT Babbling transmit error. Indicates that the transmitted frame exceeded MAX_FRAME_LENGTH
bytes. This condition is usually caused by too large a a frame being placed into the transmit data
buffers. The transmit frame is not truncated.
3 GRA Graceful stop complete. A graceful stop initiated by the setting of GTS is complete. GRA is set
when the transmitter Þnishes sending any frame that was in progress when GTS was set.
4 TFINT Transmit frame interrupt. Indicates that a frame was sent and that the last corresponding BD was
updated.
5 TXB Transmit buffer interrupt. Indicates that a TxBD was updated.
6 RFINT Receive frame interrupt. Indicates that a frame was received and that the last corresponding BD
was updated.
7 RXB Receive buffer interrupt. Indicates that a RxBD was updated.
8 MII MII interrupt. Indicates that the MII completed the requested data transfer.
9 EBERR Ethernet bus error occurred. Indicates that a bus error occurred when the FEC was accessing the
U bus.
10Ð31 Ñ Reserved. Should written to zero by the host processor.
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