Documentation/networking/defza.txt - linux - Git at Google

 Notes on the DEC FDDIcontroller 700 (DEFZA-xx) driver v.1.1.4.


 DEC FDDIcontroller 700 is DEC's first-generation TURBOchannel FDDI
 network card, designed in 1990 specifically for the DECstation 5000
 model 200 workstation.  The board is a single attachment station and
 it was manufactured in two variations, both of which are supported.

 First is the SAS MMF DEFZA-AA option, the original design implementing
 the standard MMF-PMD, however with a pair of ST connectors rather than
 the usual MIC connector.  The other one is the SAS ThinWire/STP DEFZA-CA
 option, denoted 700-C, with the network medium selectable by a switch
 between the DEC proprietary ThinWire-PMD using a BNC connector and the
 standard STP-PMD using a DE-9F connector.  This option can interface to
 a DECconcentrator 500 device and, in the case of the STP-PMD, also other
 FDDI equipment and was designed to make it easier to transition from
 existing IEEE 802.3 10BASE2 Ethernet and IEEE 802.5 Token Ring networks
 by providing means to reuse existing cabling.

 This driver handles any number of cards installed in a single system.
 They get fddi0, fddi1, etc. interface names assigned in the order of
 increasing TURBOchannel slot numbers.

 The board only supports DMA on the receive side.  Transmission involves
 the use of PIO.  As a result under a heavy transmission load there will
 be a significant impact on system performance.

 The board supports a 64-entry CAM for matching destination addresses.
 Two entries are preoccupied by the Directed Beacon and Ring Purger
 multicast addresses and the rest is used as a multicast filter.  An
 all-multi mode is also supported for LLC frames and it is used if
 requested explicitly or if the CAM overflows.  The promiscuous mode
 supports separate enables for LLC and SMT frames, but this driver
 doesn't support changing them individually.


 Known problems:

 None.


 To do:

 5. MAC address change.  The card does not support changing the Media
    Access Controller's address registers but a similar effect can be
    achieved by adding an alias to the CAM.  There is no way to disable
    matching against the original address though.

 7. Queueing incoming/outgoing SMT frames in the driver if the SMT
    receive/RMC transmit ring is full. (?)

 8. Retrieving/reporting FDDI/SNMP stats.


 Both success and failure reports are welcome.

 Maciej W. Rozycki  <macro@linux-mips.org>
	Notes on the DEC FDDIcontroller 700 (DEFZA-xx) driver v.1.1.4.


	DEC FDDIcontroller 700 is DEC's first-generation TURBOchannel FDDI
	network card, designed in 1990 specifically for the DECstation 5000
	model 200 workstation. The board is a single attachment station and
	it was manufactured in two variations, both of which are supported.

	First is the SAS MMF DEFZA-AA option, the original design implementing
	the standard MMF-PMD, however with a pair of ST connectors rather than
	the usual MIC connector. The other one is the SAS ThinWire/STP DEFZA-CA
	option, denoted 700-C, with the network medium selectable by a switch
	between the DEC proprietary ThinWire-PMD using a BNC connector and the
	standard STP-PMD using a DE-9F connector. This option can interface to
	a DECconcentrator 500 device and, in the case of the STP-PMD, also other
	FDDI equipment and was designed to make it easier to transition from
	existing IEEE 802.3 10BASE2 Ethernet and IEEE 802.5 Token Ring networks
	by providing means to reuse existing cabling.

	This driver handles any number of cards installed in a single system.
	They get fddi0, fddi1, etc. interface names assigned in the order of
	increasing TURBOchannel slot numbers.

	The board only supports DMA on the receive side. Transmission involves
	the use of PIO. As a result under a heavy transmission load there will
	be a significant impact on system performance.

	The board supports a 64-entry CAM for matching destination addresses.
	Two entries are preoccupied by the Directed Beacon and Ring Purger
	multicast addresses and the rest is used as a multicast filter. An
	all-multi mode is also supported for LLC frames and it is used if
	requested explicitly or if the CAM overflows. The promiscuous mode
	supports separate enables for LLC and SMT frames, but this driver
	doesn't support changing them individually.


	Known problems:

	None.


	To do:

	5. MAC address change. The card does not support changing the Media
	Access Controller's address registers but a similar effect can be
	achieved by adding an alias to the CAM. There is no way to disable
	matching against the original address though.

	7. Queueing incoming/outgoing SMT frames in the driver if the SMT
	receive/RMC transmit ring is full. (?)

	8. Retrieving/reporting FDDI/SNMP stats.


	Both success and failure reports are welcome.

	Maciej W. Rozycki <macro@linux-mips.org>