Eventide H90

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
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guiddruid
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Post by guiddruid »

Internal view at 6m7s:

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Post by guiddruid »

From Youtube comments:
@Rwedelich
Eventide Dev here. I'll only comment on what you got wrong about the processing power b/c I don't want misinformation out there. It'd be amazing if we could squeeze all that DSP math out of a 108 MHz chip, but alas, that's just not true. The GigaDevices chip is not the main processor. It's just a board micro controller, and in fact, there are two of them in the box. The main event is an NXP imx8 mounted under the audio board. It's a quad core Cortex-A53 1.6 GHz per core processor (with additional Cortex-M4 coprocessor). The manual is like 4000 pages long. I DO NOT recommend you disassemble to access it b/c of the risk of damage to the unit.
I was wondering how replacing the 150MIPS 56367 (https://www.nxp.com/docs/en/user-guide/DSP56367UM.pdf) with a 56MHz Cortex M3 (https://gd32mcu.com/data/documents/data ... Rev2.8.pdf) resulted in usable processing power.

Seems odd that there's no evidence of the decoupling capacitors & vias for the processor Rwedelich is referring to. Presumably means QFP & not a BGA package like the processors used in the H9000 (https://cdn.eventideaudio.com/uploads/2 ... 4x366.jpeg). No big heatsink either, although there may be a thermal pad sinking heat out to the chassis.
[edit] Hmm. Only part which matches the description is the "i.MX 8M Mini". Only comes in 0.5mm BGA. https://www.nxp.com/docs/en/data-sheet/IMX8MMCEC.pdf

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