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Rabbit 6000 User’s Manual
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292
6. Select the desired configuration of transmit and receive operation by writing to NBTCR,
NBTESR, and MBRCR.
7. Write the device’s physical MAC address to the physical address (NBPAxR) and station
address registers (NBSAxR).
8. If desired, write to the multicast filter registers (NBMFxR) to generate a multicast filter.
9. Select other options in the configuration registers NBCFxR, NBGxR, NBRMR, NBCWR, and
NBFLxR.
10.Enable the network port transmitter by writing to NBTCR.
11.Enable the network port receiver by writing to NBRCR.
25.3.2 Transmit
The following steps explain how to transmit an Ethernet packet.
1. Set up a DMA buffer descriptor that will read the packet data from memory and write it to
NBDR. Write the buffer descriptor’s address to the DMA’s initial address registers (see
Chapter 24 for more information).
2. Enable the DMA transfer by auto-loading the buffer.
3. The packet transmission will proceed automatically. If any interrupts were enabled for any
transmitted packet events, they will occur upon completion (or error).
Note that network interrupts will occur when the data appears in the network peripheral, but DMA
interrupts will occur when the DMA transfer is complete.
25.3.3 Receive
The following steps explain how to receive an Ethernet packet.
1. Set up a DMA buffer descriptor that will read the packet data from NBDR and write it to mem-
ory. Write the buffer descriptor’s address to the DMA’s initial address registers (see
for more information).
2. Set up a DMA interrupt to handle the packet once it has been received and copied to memory.
3. Enable the DMA transfer by auto-loading the buffer.
4. The packet transmission will proceed automatically when data come in. When the DMA trans-
fer is complete, the DMA interrupt can be used to start the packet processing. The status of the
received packet is appended to the received data.
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