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 same time as the initialization bit. You should also have a variable that stores the current ‘pointer’ into each buffer i. In this article we will use the latter. If you want to keep 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. LADR is the logical address filter you want the card to use when deciding to accept Ethernet packets with logical addressing. You probably want this as it is far easier to poll for this situation which only occurs once anyway.
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Retrieved from ” https: Articles that may contain original research from November All articles that may contain original research All articles with unsourced statements Articles with unsourced statements from July At initialization, you would want the card to ‘own’ all the receive buffers so it can write new packets into them that it receives, then flip ownership to the driverand the driver to ‘own’ all the transmit buffers so it can write packets to be transmitted, then flip ownership to the driver.
Once initialization has completed, pcnef can finally start the card. You probably want this as it is far easier to poll for this situation which only occurs once anyway. Will poll computer memory every 1.
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. November Learn how and when to remove this template message. Personal tools Log in.
Please improve it by verifying the claims made and adding inline citations. If a new packet etthernet been signalled then CSR0 bit 10 will be set. Views Read View source View history. Up to ring buffers can be used. MODE provides various functions to control how the card works with regards to sending and receiving packets, and running loopback tests. This article will focus on the Am79CA a.
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. To actually set up the card registers, we provide it with the address of our initialization structure by writing the low bits of its address to CSR1 and the high bits to CSR2. C chips have a bug which causes garbage to be inserted in front pcent the received aamd.
AMD Lance Am7990
You probably want to set it to zero enable transmit and receive functionality, receive broadcast packets and those sent this physical address, disable promiscuous mode. No capability for transmit buffer byte count of zero. Depending on your design this may be preferable.
You also need to specify the physical address MAC address you want the card to use. It has built-in support for CRC checks and can automatically pad short packets to the minimum Ethernet length. Each of these then contains a pointer to the actual physical address of the memory used for the packet. 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 same time as the initialization bit.
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. Contents 1 Overview 2 Initialization and Register Access 2.
Finally, once all our ring buffers are set up, we need to give their addresses to the card. External loopback on a live network may cause reception of invalid loopback failure indications.
We will flesh out the interrupt handler later, but you should install the interrupt handler here as otherwise you will get crashes due to unhandled interrupts.
If this is cleared, it means the driver ‘owns’ that particular ring buffer entry.
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You should also have a variable that stores the current ‘pointer’ into each buffer i. Retrieved from ” https: You need to parse ACPI tables etc.
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