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. Retrieved from ” https: External loopback on a live network may cause reception of invalid loopback failure indications. Views Read View source View history. In other languages Deutsch. 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.
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Receive lockup may occur if bus latency is large. There are two ways of setting up the card registers: You will need to allocate a 28 byte region of physical memory, aligned on a bit boundary.
Once all the control registers are set up, you set bit 0 of CSR0, and then wait for initialization to be done.
Of course, this precludes multicast support. Archived from the original on This page has been accessed 13, times.
This page was last edited on 17 Aprilat If a new packet has been signalled then CSR0 bit 10 will be set. No capability for transmit buffer byte count of zero.
This section possibly contains original research. Interrupt done mask – if set then you won’t get an interrupt when the card has finished initializing. Contents 1 Overview 2 Initialization and Register Access 2.
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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. You also need to specify the physical address MAC address you want the card to use.
From Wikipedia, the free encyclopedia. Transmit interrupt mask – if set then an interrupt won’t be triggered when a pcnwt has completed sending. MODE provides various functions to control how the card works with regards to sending and receiving packets, and running loopback tests. You need to parse ACPI tables etc.
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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 mad all the transmit buffers so it can write packets to be transmitted, then flip ownership to the driver. The card regularly scans all the transmit buffers looking for one it hasn’t sent, and then will transmit those it finds. Retrieved from ” https: Finally, once all our ring buffers are set up, we need pacekt give their addresses to the card.
You can do this by either waiting for an interrupt if you didn’t disable the initialization done interrupt in CSR3 or by packst until CSR0 bit 8 is set. The card maintains separate pointers internally. A further important register exists in the IO space called the reset register.
The packst section will enable some interrupts on the card. We simply fail and return. We will flesh out the interrupt pcndt later, but you should install the interrupt handler here as otherwise you will get crashes due to unhandled interrupts. 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.
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In this article we will use the latter. About This site Joining Editing help Recent changes.
Once initialization has completed, you can finally start the card. Receive descriptor zero byte count buffer interpreted as available bytes.
Archived from the original PDF on If it is set, it means the card owns it and the driver should not touch the entire entry. After you have properly handled an interrupt, you will need to write a 1 back to the appropriate bit in CSR0 or CSR4 before sending EOI to you interrupt controller or the interrupt will continue to be signalled.