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GAL14500

GAL16V8 MC14500-LIKE UNIT

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This GAL (ATF16V8B...) version of the MC14500 has some differences in working with peripherals, but it has an original instruction set.

The Motorola MC14500B is a single chip, one-bit static CMOS processor optimized for decision-oriented tasks. The processor is housed in a 16-pin package and features 16-four-bit instructions. The instructions perform logical operations on data appearing on a one-bit bidirectional data line and data in a one-bit accumulating Result Register within the ICU. All operations are performed at the bit level.

See more in MC14000B INDUSTRIAL CONTROL UNIT HANDBOOK.

This GAL (ATF16V8B...) version of the MC14500has an original instruction set, but it has some differences:

Data is read from a separate DI input and written to a separate DO output during GAL's clock rise, at the time of instruction execution. This unit does not have usually unused pins RET, FLG0, FLGF (but they are easily to implement each by external single logic gates).

GAL and reprogrammable ATF SPLDs can be easily programmed by afterburner.

  • 1 × ATF16V8B Logic ICs / Programmable Logic: PLDs

  • Add some peripheries

    Артём Шакиров01/24/2021 at 12:08 0 comments

    Standalone ICU without ROM isn't very interesting, and i made some 16V8 for working with it:

    • One bit IO: for 4 back-readable outputs and 3 inputs + oscillator/clock (inverter and non-inverter);
    • I2C EEPROM controller: for start and proceed getting program codes from I2C memories to HC595 register clocked by HOLD and counter's MSB, ICU clocked by counter's MSB too, SDA connected via diode.

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  • 1
    Assemble to .jed

    USE GALasm for assemble .pal file from GitHub.

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