Re: aic7xxx Driver support faster than 20MB/sec?

Albert D. Cahalan (
Fri, 4 Dec 1998 21:40:33 -0500 (EST)

Matthias Andree writes:
> On Thu, Dec 03, 1998 at 04:42:25PM -0800, Timm Gleason wrote:

>> Does anyone know if the current version of the aic7xxx driver(5.1.4)
>> support faster than 20MB/sec maximum transfer rate?
>> aic7xxx driver 5.1.4 and does not seem to accept negotiation higher
>> than 20MB/sec. Yes, I have checked the SCSI BIOS for the controller
>> and all ID's are set to 80MB/sec rate.
> You're not stating if you have U2SCSI, but I assume you don't. So I can
> assume you are messing up MB/s and MXfers/s: The MB/s are derived from
> MXfers/s and the actual transfer width. So, 20 MXfers/s on a narror bus
> are 20 MB/s, 20 MXfers/s with a 16bit wide transfer gives 40 MB/s (which
> is what you can probably achieve with the 20 MHz setting), a 32 bit wide
> transfer would offer 80 MB/s, but I doubt your equipment actually does
> 32 Bit transfers.

This is a FAQ I think. Perhaps it would be better to print something
like 1*20 MHz, 2*20 MHz, or 4*20MHz.

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