During normal initialization and use of the cards, the CSRs are used exclusively. Receive descriptor zero byte count buffer interpreted as available bytes. If a new packet has been signalled then CSR0 bit 10 will be set. 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. From Wikipedia, the free encyclopedia.
|Date Added:||1 December 2007|
|File Size:||20.70 Mb|
|Operating Systems:||Windows NT/2000/XP/2003/2003/7/8/10 MacOS 10/X|
|Price:||Free* [*Free Regsitration Required]|
Finally, once all our ring buffers are set up, we need to give their addresses to the card.
If this is cleared, it means the driver ‘owns’ that particular ring buffer entry. In this article we will use the latter.
You should also have a variable that stores the current ‘pointer’ into each buffer i. If it is set, it means the card owns it and the driver should not touch the entire entry. External loopback on a live network may cause reception of invalid loopback failure indications. Interrupt done mask – if set then you won’t get an interrupt when the card has finished initializing. If a new packet has been signalled then CSR0 bit 10 will be set. The card uses two ring buffers to store packets: LADR is the logical address filter you want the card to use when deciding to accept Ethernet packets with logical addressing.
Transmit interrupt mask – if set then an interrupt won’t be triggered when a packet has completed sending. This means you should be able use the original bit software on these members of the PCnet family of single-chip Ethernet controllers.
This article will focus on the Am79CA a. Receiving packets is normally done in your interrupt handler – the card will signal an interrupt etjernet it receives a packet and has written it to the receive buffer. 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.
Articles that may contain original research etherneh November All articles that may contain original research All articles with unsourced statements Articles with unsourced statements from July This page has been accessed 13, times.
AMD Lance Am7990
This page was last modified on 11 Juneat See the spec description of CSR15 for further details. 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.
Depending on your design this may be preferable.
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. Please improve it by verifying the claims made and adding packwt citations. But the “Table B About This site Joining Editing help Recent changes.
No capability for transmit buffer byte count of zero. At initialization, you would want sthernet card to ‘own’ all the receive buffers so pcbet 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. A further important register exists in the IO space called the reset register.
AMD Lance Am – Wikipedia
If you do not wish to use logical addressing the defaultthen set these bytes to zero. You probably want this as it is far easier to etthernet for this situation which only occurs once anyway.
The card regularly scans all the transmit buffers looking for one it hasn’t sent, and then will transmit those it finds. This page was last edited on 17 Aprilat