Motorola MPC8260 - Manual (Page 690)

24-22 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA
Part IV. Communications Processor Module
Figure 24-10 shows an example of interrupts that can be generated in Ethernet protocol.
Figure 24-10. Ethernet Interrupt Events Example
9Р10 С Reserved, should be cleared.
11 TXE Set when an error occurs on the transmitter channel.
12 RXF Rx frame. Set when a complete frame has been received on the Ethernet channel.
13 BSY Busy condition. Set when a frame is received and discarded due to a lack of buffers.
14 TXB Tx buffer. Set when a buffer has been sent on the Ethernet channel.
15 RXB Rx buffer. Set when a buffer that was not a complete frame was received on the Ethernet channel.
Table 24-9. SCCE/SCCM Field Descriptions (Continued)
Bits Name Description
RXB
Line Idle
Stored in Rx Buffer
RXD
RENA
Frame
Received in Ethernet
Time
Line Idle
TXD
TENA
Frame
Transmitted by Ethernet
CLSN
TXB, GRA TXB
Line Idle Line Idle
Stored in Tx Buffer
NOTES :
Ethernet SCCE
Events
1. RXB event assumes receive buffers are 64 bytes each.
2. The RENA events, if required, must be programmed in the parallel I/O ports, not in the SCC itself.
3. The RxF interrupt may occur later than RENA due to receive FIFO latency.
NOTES:
Ethernet SCCE
Events
1. TXB events assume the frame required two transmit buffers.
2. The GRA event assumes a
GRACEFUL STOP TRANSMIT command was issued during frame transmission.
P SFD DA SA CR
RXF
3. The TENA or CLSN events, if required, must be programmed in the parallel I/O ports, not in the SCC itself.
T/L D
P SFD DA SA CR T/L D
LEGEND:
P = Preamble, SFD = Start frame delimiter, DA and SA = Source/Destination address,
T/L = Type/Length, D = Data, CR = CRC bytes