MPC8280 datasheet(809/1386 Pages) FREESCALE

809 / 1386 page

SCC Ethernet Mode

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

25-21

Figure 25-10 shows an example of interrupts that can be generated in Ethernet protocol.

Figure 25-10. Ethernet Interrupt Events Example

Note that the SCC status register (SCCS) cannot be used with the Ethernet protocol. The current state of

the RENA and CLSN signals can be found in the parallel I/O ports.

BSY

Busy condition. Set when a frame is received and discarded due to a lack of buffers.

TXB

Tx buffer. Set when a buffer has been sent on the Ethernet channel.

RXB

Rx buffer. Set when a buffer that was not a complete frame was received on the Ethernet channel.

Table 25-9. 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

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.

PSFD DA SA

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

PSFD DA SA

T/L

LEGEND:

P = Preamble, SFD = Start frame delimiter, DA and SA = Source/Destination address,

T/L = Type/Length, D = Data, CR = CRC bytes

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