Driver dec 21140 fast ethernet adapter

In this chapter will see the initialization phase, how the controller uses the host memory and the 2 threads launched at the initialization time. Once the attach function executed, the driver initializes the DEC chip. Then the driver connects an interrupt handler to the interrupt line driven by the Ethernet controller the only interrupt which will be treated is the receive interrupt and launches 2 threads : a receiver thread and a transmitter thread.

Then the driver waits for incoming frame to give to the protocol stack or outcoming frame to send on the physical link. This DEC chip uses the host memory to store the incoming Ethernet frames and the descriptor of these frames. We have chosen to use 7 receive buffers and 1 transmit buffer to optimize memory allocation due to cache and paging problem that will be explained in the section Encountered Problems.

To reference these buffers to the DEC chip we use a buffer descriptors ring. The descriptor structure is defined in the Buffer Descriptor Figure. Each descriptor can reference one or two memory buffers. We choose to use only one buffer of bytes per descriptor. The difference between a receive and a transmit buffer descriptor is located in the status and control bits fields.

This thread is event driven. Each valid incoming ethernet frame is sent to the protocol stack and the buffer descriptor is given back to the DEC board the host processor reset bit OWN, which means descriptor belongs to This thread is also event driven. Each time an Ethernet frame is put in the transmit queue, an event is sent to the transmit thread, which empty the queue by sending each outcoming frame.

Because we use only one transmit buffer, we are sure that the frame is well-sent before sending the next. Talking Tom Cat. Clash of Clans. Subway Surfers. TubeMate 3. Google Play. Microsoft is done with Xbox One. N95, KN95, KF94 face masks. Apple pulls Wordle clones. Windows Windows. Most Popular. New Releases. Talking Tom Cat. Clash of Clans. Subway Surfers. TubeMate 3. Google Play. Microsoft is done with Xbox One.

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By an advanced offer aimed primarily at. Receiving as the hardware ethernet card I lose. Intel Based PCI Fast Ethernet Adapter Emulated - there are 3 drivers found for the selected device, which you can download from our website for free. I recently switched my motherboard to a Pentium II based system. This chip set does not work with Windows NT.