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68k module active low or high? #17

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atrac17 opened this issue Nov 30, 2023 · 3 comments
Closed

68k module active low or high? #17

atrac17 opened this issue Nov 30, 2023 · 3 comments

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@atrac17
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atrac17 commented Nov 30, 2023

There's no indication of active low or high in the 68k module port definition. I recently tried to use this in a project and assumed it was low. No activity when the CPU was hooked up.

Double checked when using the 68k module in quartus, there's no errors when building (thought it might not be finding the micro code files). Possible to comment the in/out in the 68k module so the manual can be referenced? Thank you for your work @nukeykt.

module m68kcpu

@nukeykt
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nukeykt commented Dec 1, 2023

everything should be as a real chip (i.e active low). For open drain outputs 0 = high impedance, 1 = GND. For DATA_z: 0=output enable, 1=high impedance

@thehughhefner
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В настоящее время в этом нет необходимости

@atrac17 atrac17 closed this as completed Dec 4, 2023
@atrac17
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atrac17 commented Dec 4, 2023

everything should be as a real chip (i.e active low). For open drain outputs 0 = high impedance, 1 = GND. For DATA_z: 0=output enable, 1=high impedance

Thank you, I have signs of life now in signal tap.

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