It's my understanding that saying that the bus speed is 33 MHz means that
data is transferred every 30.3+ nSec. The original PCI bus is a 16-bit bus
so 33-MHz is the (16-bit) word speed and the byte rate is 66 MB/Sec. Newer
PCI bus architecture expands to either 66 MHz or 32-bit words or both.
Norm
----- Original Message -----
From: Pablo Alvarez <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, February 22, 2002 11:31 AM
Subject: [rtl] PCI bus transfers
> Hi all,
>
> This is not strictly an RTLinux question, but I hope you can help: we are
> transferring data across the PCI bus, and it seems to be quite slow. The
> manufacturer (Dell) claims that the PCI bus speed is 33 MHz. Am I missing
> something in translating that 33 Mbits/sec? Or should I believe that,
since
> it is a 32-bit bus, it's actually 32*33 = 1056 Mbits/sec? Or are only
some of
> the 32-bits actually used to transmit data?
>
> Thanks,
>
> Pablo Alvarez
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