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39 ADMtek AN986 Pegasus USB Ethernet driver
49 driver provides support for USB ethernet adapters based on the ADMtek
50 AN986 Pegasus chipset, including the LinkSys USB100TX, the Billionton
51 Systems USB100, the Melco Inc. LU-ATX, the D-Link DSB-650TX and the
54 The Pegasus contains a 10/100
55 ethernet MAC with MII interface and is designed to work with both
56 ethernet and HomePNA transceivers. Although designed to interface with
57 100Mbps peripherals, the existing USB standard specifies a maximum
58 transfer speed of 12Mbps. Users should therefore not expect to actually
59 achieve 100Mbps speeds with these devices.
61 The Pegasus supports a 64-bit multicast hash table, single perfect
62 filter entry for the station address and promiscuous mode. Packets are
63 received and transmitted over separate USB bulk transfer endpoints.
67 driver supports the following media types:
69 .Bl -tag -width xxxxxxxxxxxxxxxxxxxx
71 Enable autoselection of the media type and options.
72 The user can manually override
73 the autoselected mode by adding media options to the
77 Set 10Mbps operation. The
79 option can also be used to enable
81 operation. Not specifying
87 Set 100Mbps (fast ethernet) operation. The
89 option can also be used to enable
91 operation. Not specifying
100 driver supports the following media options:
102 .Bl -tag -width xxxxxxxxxxxxxxxxxxxx
104 Force full duplex operation. The interface will operate in
105 half duplex mode if this media option is not specified.
108 For more information on configuring this device, see
112 .It "aue%d: watchdog timeout"
113 A packet was queued for transmission and a transmit command was
114 issued, however the device failed to acknowledge the transmission
115 before a timeout expired.
116 .It "aue%d: no memory for rx list"
117 The driver failed to allocate an mbuf for the receiver ring.
125 .%T ADMtek AN986 data sheet
126 .%O http://www.admtek.com.tw
131 device driver first appeared in
136 driver was written by
137 .An Bill Paul Aq wpaul@ee.columbia.edu .
139 For some reason, outgoing bulk transfers (i.e. packet transmissions)
140 fail if the transfer is exactly a multiple of 64 bytes in size. The
142 driver works around this by padding such transfers up by one additional
143 byte. This does not affect connectivity, however it does cause packets
144 to occasionaly appear on the wire with one additional byte for no good
145 reason. It is not known if this bug is due to a problem with Pegasus
146 chip itself or some peculiarity of the underlying USB support.