101 lines
3.7 KiB
Groff
101 lines
3.7 KiB
Groff
.\" $NetBSD: clmpcc.4,v 1.2 1999/12/15 23:44:53 abs Exp $
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.\"
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.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Steve C. Woodford.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd November 28, 1999
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.Dt CLMPCC 4 mvme68k
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.Os
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.Sh NAME
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.Nm clmpcc
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.Nd Cirrus Logic CD2400/CD2401 serial communications controller
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.Sh SYNOPSIS
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.Cd "clmpcc0 at pcctwo? ipl 4"
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.Pp
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for the Cirrus Logic CD2401 Multi-protocol
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Communications Controller found on Motorola MVME167 and MVME177
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single-board computers.
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.Pp
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The chip integrates four serial channels in one package,
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with each channel being completely independent and capable of
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running in Async (with optional DMA control), Bisync, HDLC/SDLC and
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X.21 modes. Each channel has 32 bytes of FIFO, split into 16 bytes
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for the Tx side and 16 bytes for the Rx side.
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.Pp
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At the present time, the
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.Nm
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driver supports the non-DMA Async mode of operation, utilising the
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channel FIFOs to maximize throughput with minimal interrupt overhead.
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.Pp
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The Motorola MVME1x7 boards provide a 20MHz master clock to the device,
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which allows the Tx and Rx side to be independently set to any
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baud rate in the range 50 to 57600.
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The device should be capable of running at
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a baud rate of 115200, however it is not a rate documented in the
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device's datasheet for Async. mode so is not recommended.
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.Sh FILES
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.Bl -tag -width Pa
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.It Pa /dev/console
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.It Pa /dev/ttyC1
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.It Pa /dev/ttyC2
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.It Pa /dev/ttyC3
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.El
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.Sh DIAGNOSTICS
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.Bl -diag
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.It clmpcc%d: channel %d command timeout (idle)
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The chip failed to acknowledge a command sent to the specified
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channel.
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.It clmpcc%d: Failed to reset chip
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The
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.Nm
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driver was unable to determine if the chip completed
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it's RESET processing.
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.El
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.Sh SEE ALSO
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.Xr pcctwo 4 ,
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.Xr tty 4
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.Sh HISTORY
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The
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.Nm
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driver first appeared in
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.Nx 1.4
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and is
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.Ud
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.Sh BUGS
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The hardware flow control features of the chip are not yet fully
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supported.
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