From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marc Kleine-Budde Subject: Re: Linux board with 10 CANs Date: Fri, 15 May 2015 14:48:22 +0200 Message-ID: <5555EB16.4090903@pengutronix.de> References: <5555A6A3.7090206@orange.fr> <5555B82B.2010204@pengutronix.de> <5555BD6A.60204@orange.fr> <5555E8DC.7050209@ems-wuensche.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="81KgVGsSme9lfP7kEcvw2HnvInuSBog4n" Return-path: Received: from metis.ext.pengutronix.de ([92.198.50.35]:51242 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161018AbbEOMse (ORCPT ); Fri, 15 May 2015 08:48:34 -0400 in-reply-to: <5555E8DC.7050209@ems-wuensche.com> Sender: linux-can-owner@vger.kernel.org List-ID: To: Gerhard Uttenthaler , =?UTF-8?Q?Fran=c3=a7ois_Beaulier?= , Yegor Yefremov Cc: "linux-can@vger.kernel.org" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --81KgVGsSme9lfP7kEcvw2HnvInuSBog4n Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 05/15/2015 02:38 PM, Gerhard Uttenthaler wrote: >> Module based solutions are too expensive, whether it is PCIe or >> USB. There are some bridge chips PCIe <-> memory, but i'm not >> familiar with that. And you are right the SJA1000 is an old 5V >> beast ! > Also a point to consider is that the speed you can read a SJA1000 chip > is based on the clock frequency of this chip. And you have to > read/write byte by byte. This may be too slow for 10 channels. A local memory bus may be faster for single byte/word accesses than a PCIe bus. I'm not a hardware guy, though :) Marc --=20 Pengutronix e.K. | Marc Kleine-Budde | Industrial Linux Solutions | Phone: +49-231-2826-924 | Vertretung West/Dortmund | Fax: +49-5121-206917-5555 | Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de | --81KgVGsSme9lfP7kEcvw2HnvInuSBog4n Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEcBAEBCgAGBQJVVesWAAoJEP5prqPJtc/HSlkH/0VbRyo3v/sDxFJDto3QM1pg zMigiCZyd3Y1h5sOVgATxIODuArb0RqXq1XFTxi0VMwfTKK8RsmiK+372MICfOyB TkzlR+ZXjuS0bIAmpM1yJAhe9IJzyvaK46d/qiT1fdTHu0kGDqFdeGaj3gYj9Oi0 oDwFzvSrH0CtUtxWDqiAaj2qX6xbnznVjXtBermgeuAQe4MrN9seI5IjVHU+AI2w vMXllH4NDSzoyn1Du5XYgv6Dr+/ZXtB/+E3aXaSdCsOhIlJ/2H2KVcE4jHXBYHm5 qHSzEtN1B0tybvVXi/tkU2vPftVzZO/xvpSIrnQWg+RXHf81PsXNGK1yVSuRrs4= =ou6Y -----END PGP SIGNATURE----- --81KgVGsSme9lfP7kEcvw2HnvInuSBog4n--