NAME    [Toc]    [Back]

     en -- device driver for Midway-based ATM interfaces

SYNOPSIS    [Toc]    [Back]

     device en
     device atm
     device utopia

DESCRIPTION    [Toc]    [Back]

     The en device driver supports Midway-based ATM interfaces including the
     Efficient Networks, Inc. ENI-155 and Adaptec ANA-59x0.  Midway is an AAL5
     SAR (Segmentation and Reassembly) chip.

     For configuring the card for IP see natmip(4).

     The following sysctls are recognized by the driver additionally to those
     handled by utopia(4):

     hw.atm.enX.istats
	  Contains an array of uint32_t with internal driver statistics.

     hw.atm.enX.debug
	  This is a bit map of debugging options.  This variable is only
	  available when the driver is compiled with debugging support.

     The driver supports the media options sdh, noscramb and unassigned (see
     utopia(4) ).

DIAGNOSTICS    [Toc]    [Back]

     en0 <Efficient Networks ENI-155p> rev 0 int a irq 5 on pci0:16
     en0: ATM midway v0, board IDs 6.0, Utopia (pipelined), 512KB on-board RAM
     en0: maximum DMA burst length = 64 bytes
     en0: 7 32KB receive buffers, 8 32KB transmit buffers allocated

CAVEATS    [Toc]    [Back]

     The driver extensively uses DMA on PCI.  The first generation PCI
     chipsets do not work or exhibit poor performance.

SEE ALSO    [Toc]    [Back]

     natm(4), natmip(4), utopia(4), ifconfig(8), route(8)

AUTHORS    [Toc]    [Back]

     Chuck Cranor of Washington University implemented EN driver in 1996 for
     NetBSD.


FreeBSD 5.2.1			 June 3, 2003			 FreeBSD 5.2.1