The card regularly scans all the transmit buffers looking for one it hasn’t sent, and then will transmit those it finds. Personal tools Log in. MODE provides various functions to control how the card works with regards to sending and receiving packets, and running loopback tests. This page was last edited on 17 April , at Sending packets involves simply writing the packet details to the next available transmit buffer, then flipping the ownership for the particular ring buffer entry to the card.

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Networking hardware Integrated circuits. Finally, once all our ring buffers are set up, we need to give their addresses to the card. And you may want to set bit 11 of CSR4 which automatically pads Ethernet packets which are too short to be at least 64 bytes. You can do this by either waiting for an interrupt if you didn’t disable the initialization done interrupt in CSR3 or by polling until CSR0 bit 8 is set.

If you do pcent wish to use logical addressing the defaultthen set these bytes to zero. C chips have a bug which causes garbage to be inserted in front of the received packet. But the “Table B During normal initialization and use of the cards, the CSRs are used exclusively. You probably want this as it is far easier to poll for this situation which only occurs once anyway.


Archived from the original PDF on The card maintains separate pointers internally. Features a Time-domain reflectometer TDR with a granularity of 30 meter.

Network drivers

LADR is the logical address filter you want the card to use when deciding to accept Ethernet packets with logical addressing. Views Read View source View history. In other languages Deutsch.

Note that if you want to wait for an interrupt you will also need to set bit 6 of CSR0 or interrupts won’t be generated you will need to enable this anyway to get notification of received packets, so it makes sense to set it at the pcjet time as the initialization bit.

Receive lockup may occur if bus latency is large. Archived from the original on If this is cleared, it means the driver ‘owns’ that particular ring buffer entry. There are other bits in CSR0 than can be set depending on how you set up interrupt masks in CSR3 and additionally other bits in CSR4 that can signal interrupts although these are usually masked out on reset. You should also have a variable that stores the current ‘pointer’ into each buffer i.

If you want to pcney the current one, you will need to first read it from the EPROM of the card it is exposed as the first 6 bytes of the IO space that the registers are in.


Receiving packets is normally done in your interrupt handler – the card will signal an interrupt whenever it receives a packet and has written it to the receive buffer. Once all the control registers are set up, you set bit 0 of CSR0, and then wait for initialization to be oacket.

AMD PCnet-FAST III Ethernet Adapter (AM79C)

Transmit interrupt mask – if set then an interrupt won’t be triggered when a packet has completed sending. This page has been accessed 13, times. You also need a simple way of incrementing the pointer and wrapping back to the start if necessary.

Please improve it by verifying the claims made and adding inline citations. Note that interrupts can come from many sources other than new packets. The card uses two ring buffers to store packets: This page was last edited on 17 Aprilat A further important register exists in the IO space called the reset register. From Wikipedia, the free encyclopedia.

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