The interface will operate in half duplex mode if this media option is not specified. The dc driver supports the following media options: The chips appear to upload several kilobytes of garbage data along with the received frame data, dirtying several RX buffers instead of just the expected one. If you power down your system prior to booting FreeBSD, the card should be configured correctly. Some chips especially the PNIC also have peculiar bugs.
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The numbers are documented in the app notes, but the exact meaning of the bits is not.
ASIX drivers – ASIX Network Drivers
TX underrun — using store and forward mode The device continued to generate transmit underruns even after all possible transmit start threshold settings had been tried, so the driver programmed the chip for store and forward mode. The chips appear to upload several kilobytes of garbage data along with the received frame data, dirtying several RX buffers instead of just the expected one.
The 82c and 82c PNIC chips also have a receiver bug that sometimes manifests during periods of heavy receive and transmit activity, where the chip will improperly DMA received frames to the host. If asx see this message at boot time and the driver fails to attach the device as a network interface, you will have to perform a second warm boot to have the device properly configured.
Not specifying full-duplex implies half-duplex mode. The transmitter works but the receiver tends to produce many unexplained errors leading to very poor overall performance. This system configuration variable can be set in the Open Firmware boot monitor using the asxi command or by eeprom 8.
Xerox Phaser 3400 Internal NIC 10/100 Base T Network Interface Card 097S02722
The dc driver supports the following media types: The A does not exhibit this problem. The controller loses all of azix PCI configuration in the D3 state, so if the BIOS does not set it back to full power mode in time, it will not be able to configure it correctly.
All other modes on the A seem to work cor- rectly.
Not spec- ifying full-duplex implies half-duplex mode. For more information on configuring this device, see ifconfig aisx.
The driver tries to detect this condi- tion and bring the adapter back to the D0 full power state, but this may not be enough to return the driver to a fully operational condition. The also offers several receive filter program- ming options including perfect filtering, inverse perfect filtering and hash table filtering. The dc driver programs 82c and 82c PNIC chips to use the store and forward setting for the transmit start threshold by default.
The PNIC chips also sometimes generate a transmit underrun error when the driver attempts to download the receiver filter setup frame, which can result in the receive filter being incorrectly programmed.
The mediaopt option can also be used to enable full-duplex operation. The A seems to have a problem with 10Mbps full duplex mode. Note that this condition only occurs when warm booting from another oper- ating system. At least one supports only chained DMA descriptors most support both chained descriptors and contiguously allocated fixed size rings.
Davicom DM data sheethttp: Some chips especially the PNIC also have peculiar bugs.
Drivers – ASIX Electronics Corporation
These chips are used by many vendors which makes it difficult to provide a complete list of all supported cards. All of the clone chips are based on the design with various modifications.
Skip site navigation 1 Skip section navigation 2 Header And Logo. The dc driver detects this condition and will salvage the frame; however, it incurs a serious performance penalty in the process.
Some clone chips duplicate the fairly closely while others only maintain superficial similarities. The dc l will watch for this condition and requeue the setup frame until it is transfered successfully.
Consequently, autonegoti- ation is not currently supported for this chipset: Intel Hardware Reference Manualhttp: Some operating systems place the controller in low power mode when shutting down, and some PCI BIOSes fail to bring the chip out of this state before configuring it.
If you power down your system prior to booting FreeBSD, the card should be configured correctly. Others use different receiver filter aisx mechanisms. Some support only MII media attach- ments. The dc driver supports the following media options: