home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.sys.m68k
- Path: sparky!uunet!usc!cs.utexas.edu!oakhill!floydg
- From: floydg@oakhill.sps.mot.com (Floyd Goodrich)
- Subject: Re: 020 vs 030
- Message-ID: <1992Aug12.234441.11526@oakhill.sps.mot.com>
- Organization: Motorola Inc., Austin Tx.
- References: <AHANSFOR.92Aug12160520@hongkong.wpi.edu>
- Date: Wed, 12 Aug 1992 23:44:41 GMT
- Lines: 40
-
- ahansfor@hongkong.wpi.edu (Andrew L. Hansford) writes:
- >
- >Another group is having a discussion on whether the 020 or 030 should
- >be the minimum processor used in new systems. So I have a few
- >questions that I would like to post to a place of finding a more
- >accurate answer.
- >
- >First assume that MU is not needed by the OS so an EC030 could
- >probably be used. (Several accelerators do this)
- >
- >Given the same clock speed, the EC030 would be faster than the 020 due
- >to the data cache, and burst cycles (if the memory supports burst). Correct?
-
- Correct. The 68030 supports burst mode (for 32-bit accesses) and has a
- 256kbyte data cache. The cache really boosts performance on loops of <256kb.
- Don't forget that the STERM pin on the 68030/EC030 bus interface allows you
- to terminate a bus cycle from a 32-bit memory bank in 2 clocks instead of 3
- as the 68020 requires. At the same frequency, based on dhrystones, you get:
- 020/EC030 = 0.75 in terms of performance.
-
- >Does the EC030 have any other advantaged over the 020?
-
- It's offered in clock speeds up to 50MHz instead of just up to 33MHz. The
- package types are different, too. Some of the bus specs are better on the 030.
-
- >IS the EC030 pin compatible with the 030 so if you needed a PMMU later
- >you could just pop a 030 in place of the EC030. Does the EC030 have a
- >the coprocessor interface for an 882?
-
- It's pin compatible with the 030. The EC030 retains the coprocessor interface.
-
- >What is the current $$/chip in lots of 10,000 for the 030,EC030, and 020?
-
- Call your local Motorola Sales Office. The number in Boston is 617 932-9700
- or in Berlin, MA is 508 481-8100. They can help you get data books, too.
-
- ---
- Floyd Goodrich
- floydg@oakhill.sps.mot.com
-
-