29C256 Flash works great!

[timsiford at hushmail.com]

My 27C256 chips program in about 20 seconds.  I am using 90 nanosecond chips. 
 I have reviewed data on 'partial programming' of EPROMs and I know that 
I am not partially programming them.  The data doc on my specific EPROM 
supports my programming time.

Tim

At Fri, 15 Sep 2000 11:45:01 -0700 (PDT), Squash <realsquash at yahoo.com> 
wrote:

>
>It takes me about 2 minutes to program a 27256.  It feels more like 
>an hour, tho!
>
>Squash
>
>--- "Shawn R. Lin" <slin01 at mail.orion.org> wrote:
>> WEG1192 at aol.com wrote:
>> >
>> > How does this differ from a ROM emulator? If I understand this flash 
>device,
>> > you still have to pull the chip, and fast erase/reprogram without 
>the 15
>> > minute EPROM erase step?
>>
>> John,
>> The flash chip is very different from a ROM emulator:
>> 1) The flash chip is nonvolatile - remove power from it, and the
>> contents are still there.
>> 2) It cannot be updated or changed "on the fly".
>>
>> Also since the P4 ECM's don't support writing to flash chips, the 
>chip
>> also cannot be programmed in the car.  I suppose a very enterprising
>> individual could probably connect the /WE (Write Enable) pin to
>> something in the ECM and write a program that allows updates through 
>the
>> ALDL though.
>>
>> So yes, you are absolutely correct that you do still have to pull 
>the
>> chip, but it can fast erase/reprogram without the 15 minute EPROM 
>erase
>> step.  I believe erasing is probably nearly instantaneous taking only 
>a
>> few milliseconds.  I think it also programs a LOT faster compared 
>to an
>> EPROM.  I can't remember how long it takes to program an EPROM, but 
>this
>> flash chip was completely programmed as soon as I pressed the ENTER 
>key
>> (1 second or faster).  Probably worth the $4, IMO!
>>
>> Shawn
>>
>>
>>
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>
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