On Thu, Dec 03, 1998 at 03:38:53PM +0100, Tom Gelhause wrote:
> I also have problems with the 53c875 using Linux. These started when I
> switched to a new Board (FIC VA-503+, Via Apollo MPV3), but they only
A Tekram DC-390U (53C875) is no difficulty here, VIA Apollo MVP3 on PC
Chips M577 and Tyan Trinity 100AT S1590B.
> occur using Linux, no problems on Win NT/95. I also tryed a 53c810 and
No difficulty with NT 4, Win 95, Linux 2.0, Linux 2.1.
> also had errors. I detected no errors with an AMD controller. I only
> have SCSI II devices connected to the SCSI bus, wich is passively
> terminated. (Only one cable, good quality, also tryed an other one.) The
How many devices are there? If you have an ultra device, you MUST!!!!
use active termination, regardless if any of the targets is ultra or
not. Reasons are deeply buried in electromagnetic compatibility; the
chip itself generates sharp and steep edges which contain high
frequency components by nature. A failure to take care of these - which
is achieved by ultra-SCSI-safe cabling and active termination - will
definitely lead to problems of all kinds. Limits are: 3 m up to 4
devices, 1.5 m with 5 to 8 devices.
> Unfortunately, I don't understand the type of error. Sometimes it's a
> "phase change"-error, sometimes parity or something else. Has anybody
> any further proposals where I could look for the error?
Once again, make sure you have ACTIVE termination and meed ultra SCSI
requirements even when you don't have a single ultra device besides the
adaptor. Make sure to reduce the effects of interference, i. e. do not
tie the SCSI cable to an IDE cable and so on.
--
Matthias Andree
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