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- Newsgroups: comp.sys.next.programmer,comp.dsp
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- From: williamb@ee.ubc.ca (william burchill)
- Subject: Re: Finding how much DSP56001 RAM is installed via program??
- Message-ID: <1992Aug26.181006.6623@ee.ubc.ca>
- Keywords: DSP, 56001, NeXT
- Organization: University of BC, Electrical Engineering
- References: <1992Aug26.060638.10407@ee.ubc.ca> <17fb61INN572@agate.berkeley.edu>
- Date: Wed, 26 Aug 1992 18:10:06 GMT
- Lines: 17
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-
- I see a problem. You are reading back immediately after writing out. This
- can allow bus capacitance to appear as a valid memory location.
- I suggest you write out a pair of different test patterns. Since memory
- is organized into even lengths, when it comes time to read back for compares,
- your first read (at the start of memory) will be different from your last
- write (at the end of memory).
- Do all writes first.
- Do all reads last.
- Use an even # of test patterns.
- #addr0 patt1
- #addr1 patt2
- #addr2 patt1
- #addr3 patt2
- #addr4 patt1
- etc.
-
-