Date: Wed, 4 Aug 1999 13:18:12 +0100 From: Nigel Roles <ngr@symbionics.co.uk> To: "'Kevin'" <kbock@primenet.com> Cc: freebsd-hackers@FreeBSD.ORG, freebsd-scsi@FreeBSD.ORG Subject: RE: Tekram DC-390U2W support (80Mb/sec operation) Message-ID: <1E485299309FD211A2100090271E27A4143199@symnt3.cadence.com>
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The 53c141 is an auto-sensing single-ended/LVDS terminator, permitting
you to connect single-ended and LVDS drives to the same cable. It is
transparent.
If you want 80mbps you need
1. a wide LVDS (aka Ultra2 or fast40) drive
2. a wide LVDS terminator
The 40 in the portion of ncr.c you quote is MHz not megabytes. By having a
wide
(16 bit) drive (and bus) you get 16bits * 40MHz or 80mbps.
What makes you think you haven't got 80mbps? How would you tell?
-----Original Message-----
From: Kevin [mailto:kbock@primenet.com]
Sent: Wednesday, August 04, 1999 12:42 PM
To: freebsd-hackers@FreeBSD.ORG; freebsd-scsi@FreeBSD.ORG
Subject: Tekram DC-390U2W support (80Mb/sec operation)
Hey all, I purchased a Tekram DC-390U2W scsi controller to use with a
FreeBSD server of mine. It uses the NCR 53c141 (and 53c895?) chipset(s). I
see that ncr.c supports the NCR 53c8xx family of chipsets..
which the controller is seen as having a 53c895, which only supports
40Mb/sec operation(?)
<paste/ncr.c>
{NCR_895_ID, 0x00, "ncr 53c895 fast40 wide scsi", 7, 31, 7,
FE_WIDE|FE_ULTRA2|FE_QUAD|FE_CACHE_SET|FE_DFS|FE_LDSTR|FE_PFEN|FE_RAM}
</paste>
I am assuming that it only supports 40Mb/sec operation.. could someone
prove me wrong? I just want to get 80Mb/sec operation (would I need to have
support for the 53c141 driver? are there any out there, is it in the
works?). Tekram has FreeBSD drivers on their site but they say it is
supported in 3.0, I can't find anything newer. They are working on a new
one.. They already have support for the DC-390U2W on various Linux's of
course :(
Could anyone *please* enlighten me? I would be grateful.
Please reply to my email address, as I am not subsribed to these lists.
Thanks a lot,
Kevin
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