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  • LenSamuelson's Avatar
    Today, 02:24 AM
    I'm beginning to understand... you are not simulating ust a 27c256/27c512, you are simulating an 27c256/27c512 connected to a multiplexed address/data bus. That is a different animal... Are you planning to use only...
    8 replies | 57 view(s)
  • LenSamuelson's Avatar
    Today, 12:53 AM
    Given my continued interest in whether a Teensy can emulate an EPROM... Is your code changing the direction controls on the pins that serve as ADDRESS lines? For any addressed hardware component, its address signals...
    8 replies | 57 view(s)
  • LenSamuelson's Avatar
    Yesterday, 07:01 PM
    Sounds like you're on your way. I've wondered for several years whether a Teensy could emulate an EPROM, considering the number of times my co-workers and I wished for rapid turnaround during development, so I hope you...
    28 replies | 273 view(s)
  • LenSamuelson's Avatar
    06-19-2021, 06:32 PM
    You may want to consider how long OE# is expected to be active. If you are fairly confident that it is held active for limited time, then it may be OK to enter the ISR on OE# falling edge, then return from the ISR when...
    28 replies | 273 view(s)
  • LenSamuelson's Avatar
    06-18-2021, 01:02 PM
    In case you have not found the code already... "avr" is basically a holdover from early days, but all teensy products are supported there. Two files you are likely to be interested in studying. I have found Paul's code...
    28 replies | 273 view(s)
  • LenSamuelson's Avatar
    06-17-2021, 08:30 PM
    The discussion so far appeared to be related to 27c256 or 27c512 parts, which are just classical EPROMs, with nonmultiplexed address/data signals. So the discussion so far still fits the description. Your most recent...
    28 replies | 273 view(s)
  • LenSamuelson's Avatar
    06-17-2021, 11:35 AM
    I wondered whether that was the case... edit: If you can count on your target pulsing OE# low for each access the logic is way simpler. If your target holds OE# low for a limited time interspersed with inactive...
    28 replies | 273 view(s)
  • LenSamuelson's Avatar
    06-17-2021, 03:04 AM
    The RT106x processors are so fast that a well-written very tight interrupt service function triggered by the leading edge of OE# may be more likely to work properly than a DMA solution, and be a bit less complicated. ...
    28 replies | 273 view(s)
  • LenSamuelson's Avatar
    06-03-2021, 09:46 PM
    Is this a "spare no expense" project, or a "get the best results without going overboard" project? The ADCs in the Teensy 3.2 microcontroller can pull enough current during sampling that they appear to produce...
    3 replies | 216 view(s)
  • LenSamuelson's Avatar
    05-09-2021, 01:33 AM
    FWIW, I have been involved in a project that drives Kinetis K60 and K66 microcontroller UARTs at their max rate (150MHz sysclock /16=9.375) across optical links through 50MHz-rated transceivers. In early prototyping we...
    11 replies | 541 view(s)
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About LenSamuelson

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About LenSamuelson
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Mostly embedded, mostly comms
Location:
Ohio
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Cycling, home repair :-)
Occupation:
Developer (mostly embedded)

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