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+.\" $NetBSD: dtviic.4,v 1.5 2011/08/31 07:04:49 jruoho Exp $
+.\"
+.\" Copyright (c) 2011 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Thomas Klausner.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd August 30, 2011
+.Dt DTVIIC 4
+.Os
+.Sh NAME
+.Nm dtviic ,
+.Nm au8522 ,
+.Nm cx24227 ,
+.Nm lg3303 ,
+.Nm mt2131 ,
+.Nm nxt2k ,
+.Nm zl10353 ,
+.Nm tvpll ,
+.Nm xc3028 ,
+.Nm xc5k
+.Nd Inter IC (I2C) modules for DTV
+.Sh DESCRIPTION
+The
+.Nm
+modules provide support for
+.Xr dtv 4
+devices.
+The
+.Nm
+module group includes tuners, demodulators, and analog video decoders.
+.Pp
+The usual hardware structure consists of a host controller
+(connected for instance via
+.Xr usb 4
+or
+.Xr pci 4 )
+that provides the data moving facilities (for the analog or
+digital video streams) and an
+.Xr iic 4
+bus over which the other chips can be configured.
+.Pp
+For example, a typical
+.Xr dtv 4
+setup would look like this:
+.Bl -enum -offset indent
+.It
+Initialize transport stream
+.Pq Dv TS
+port on the host controller.
+.It
+Configure the demodulator that
+.Dq demodulates
+the information from an intermediate frequency
+.Pq Dv IF
+that is provided to it by the associated tuner.
+This step typically includes setting the desired
+quadrature amplitude modulation
+.Pq Dv QAM
+and bandwidth, among other things.
+.It
+Configure the tuner.
+Typically this step includes at least setting the frequency.
+.It
+Start TS transfer (using
+.Dv DMA
+transfers or
+.Dv USB
+high speed transfers).
+.El
+.Pp
+The supported demodulators include:
+.Bl -tag -width 10n -offset indent
+.It Nm au8522
+Auvitek AU8522 ATSC/QAM64/QAM256 demodulator
+.It Nm cx24227
+Conexant CX24227 ATSC/QAM64/QAM256 demodulator
+.It Nm lg3303
+LG LGDT3303 ATSC/QAM64/QAM256 demodulator
+.It Nm mt2131
+MicroTune MT2131 ATSC demodulator
+.It Nm nxt2k
+NxtWave Communications NXT2004 ATSC demodulator
+.It Nm zl10353
+Zarlink ZL10353 (Intel CE623x) COFDM/DVB-T demodulator
+.El
+.Pp
+The supported tuners are:
+.Bl -tag -width 10n -offset indent
+.It Ic tvpll
+Generic PLL-based tuners
+.It Nm xc3028
+XCeive XC3028 analog and digital tuner
+.It Nm xc5k
+Xceive XC5000 analog and digital tuner
+.El
+.Sh FILES
+.Bl -bullet -offset indent
+.It
+.Pa dvb-fe-nxt2004.fw
+needed by
+.Nm nxt2k
+.It
+.Pa xc3028-v27.fw
+or
+.Pa xc3028L-v36.fw
+(provided by
+.Pa pkgsrc/sysutils/xc3028l-firmware )
+needed by
+.Nm xc3028
+.It
+.Pa dvb-fe-xc5000-1.6.114.fw
+needed by
+.Nm xc5k ,
+provided by the
+.Pa pkgsrc/sysutils/xc5k-firmware
+.El
+.Sh SEE ALSO
+.Xr dtv 4 ,
+.Xr iic 4 ,
+.Xr module 7
+.Sh HISTORY
+The
+.Nm
+modules first appeared in
+.Nx 6.0 .
+.Sh AUTHORS
+.An -nosplit
+Authors include
+.An Jared D. McNeill
+.Aq jmcneill@NetBSD.org ,
+.An Jonathan A. Kollasch
+.Aq jakllsch@NetBSD.org ,
+and
+.An Jukka Ruohonen
+.Aq jruohonen@iki.fi .