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ADW(4)                   BSD Kernel Interfaces Manual                   ADW(4)

NAME
     adw -- Advansys PCI 16bit SCSI Host adapter driver

SYNOPSIS
     device pci
     device adw

     For one or more SCSI busses:
     device scbus

DESCRIPTION
     This driver provides access to the 16bit SCSI bus connected to the
     Advanced Systems Products, Inc.  ASC3550 Ultra, and ASC38C0800 Ultra2,
     SCSI Host Adapter chips.  Both chips support, synchronous transfers
     (20MHz and 40MHz max respectively), 16bit transfers, tagged queueing, and
     up to 253 concurrent SCSI transactions.

     Per target configuration performed in the AdvanceWare menu, which is
     accessible at boot, is honored by this driver.  This includes synchro-
     nous/asynchronous transfers, maximum synchronous negotiation rate, wide
     transfers, disconnection, tagged queueing, and the host adapter's SCSI
     ID.  The global setting for the maximum number of tagged transactions
     allowed per target is not honored as the CAM SCSI system will automati-
     cally determine the maximum number of tags a device can receive as well
     as guarantee fair resource allocation among devices.

HARDWARE
     The adw driver supports SCSI controllers including:

     o   AdvanSys ABP940UW/ABP3940UW
     o   AdvanSys ABP950UW
     o   AdvanSys ABP970UW
     o   AdvanSys ABP3940U2W
     o   AdvanSys ABP3950U2W

SEE ALSO
     adv(4), cd(4), da(4), sa(4), scsi(4)

AUTHORS
     The adw driver was ported by Justin T. Gibbs from the Linux driver writ-
     ten by Bob Frey of Advanced System Products, Inc.  Many thanks to Advan-
     Sys for providing the original driver under a suitable license for use in
     FreeBSD.

HISTORY
     The adw driver appeared in FreeBSD 3.0.

BSD                              July 14, 2004                             BSD