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Re: Hardware .vs. software?
- To: Mailing List Recipients <pci-sig-request@znyx.com>
- Subject: Re: Hardware .vs. software?
- From: "John R Pierce" <pierce@hogranch.com>
- Date: Fri, 8 May 1998 07:00:41 -0700
- Resent-Date: Sat, 9 May 1998 00:34:50 -0700
- Resent-From: pci-sig-request@znyx.com
- Resent-Message-ID: <"q4j_a.0.Im7.W_mKr"@electra.znyx.com>
- Resent-Sender: pci-sig-request@znyx.com
>The trick is to get the data as fast as possible into the
>CPU. Without letting the CPU wait for it or slowing it
>down. So a good UART has a databus interface as wide as
>the CPU databus and busmastering.
Name one UART with a 32 bit busmaster interface, never mind the 64bit local
bus interface of most of todays CPUs??? Since the "A" stands for
ASYNCHronous, and async stuff is generally no faster than 115kbps or
11.5kbyte/sec, I hardly see the need for either the 32bit or the busmaster
part. Yeah, it would be nice if the fifos were a bit bigger on the
'standard' 16550AF parts such that the CPU would only need to service them
every couple of milliseconds instead of just about every millisecond.
-jrp