From: Dan Malek <dan@embeddededge.com>
To: laurent.pinchart@capflow.com
Cc: linuxppc-embedded@lists.linuxppc.org
Subject: Re: SCC or SMC for console ?
Date: Thu, 14 Feb 2002 13:16:34 -0500 [thread overview]
Message-ID: <3C6BFF02.5070905@embeddededge.com> (raw)
In-Reply-To: 3C6BF3B1.2040906@capflow.com
Laurent Pinchart wrote:
> I need 4 serial ports at runtime, and was wondering if I should rather
> use 2SMC + 2SCC or 4 SCC (or 1SMC + 3SCC).
Always use SCCs for real work and the SMC for console and other low
speed things (like connected to low bit rate TDM).
The SMCs require a large amount of CPM software overhead, so not only
are they relatively slow devices, they also steal cycles from other
peripherals.
Is one of your serial ports in the example above the console? If you
need four ports not including the console that can be a little more
challenging. Carefully investigate the I/O pin multiplexing to ensure
you can get the SMC2 I/O, as that is one of the first ones stolen for
other uses.
Have fun!
-- Dan
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2002-02-14 18:16 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-02-14 17:28 SCC or SMC for console ? Laurent Pinchart
2002-02-14 18:16 ` Dan Malek [this message]
2002-02-15 13:10 ` Laurent Pinchart
2002-02-14 18:31 ` Wolfgang Denk
2002-02-15 14:24 ` Laurent Pinchart
2002-02-15 14:35 ` Wolfgang Denk
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=3C6BFF02.5070905@embeddededge.com \
--to=dan@embeddededge.com \
--cc=laurent.pinchart@capflow.com \
--cc=linuxppc-embedded@lists.linuxppc.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).