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Update Hardware info

Triss 2025-05-23 16:53:11 +00:00
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Hardware-info.md

@ -16,7 +16,7 @@ The SQ50 consists of the following components:
* 8-pin 1.25mm JST connector (JTAG)
* 3 empty slots/solder pads for more ISSI SRAM chips (probably used in the SQ100/SQ200 variants)
* Empty solder pads for a SOIC-8 chip for unknown purpose
* 147776 TP949 6EAL (QFN-16, unknown purpose)
* MAX14777, QFN-20, quad analog switch, [datasheet](https://www.analog.com/media/en/technical-documentation/data-sheets/MAX14777.pdf)
* A crystal oscillator, frequency/markings are impossibly tiny to read
### Photos
@ -77,13 +77,3 @@ You can get these ISSI SRAM chips here:
* [Farnell/Newark](https://www.newark.com/integrated-silicon-solution-issi/is61wv25616edbll-10tli/sram-4mbit-10ns-tsop-ii-44/dp/65T1338)
* [Mouser](https://eu.mouser.com/ProductDetail/ISSI/IS61WV25616EDBLL-10TLI?qs=DfG0HhEx1UX%2F12WoHJaVrQ%3D%3D)
* [RS Components](https://americas.rsdelivers.com/product/issi/is61wv25616bll-10tli/issi-sram-is61wv25616bll-10tli-4mbit/8115181)
#### NOTE / WARNING
I tried installing 3 extra RAM chips, and, despite the contacts looking fine, the following happened:
* The device LED did not turn on
* USB enumerated properly, ScanaStudio recognised the device
* Starting an acquisition does *not* work, as the Spartan-3 gateware seems to refuse to do anything
This could either be bad power contacts, or something inside the Spartan-3 gateware stopping it from functioning. I suspect it is the latter, because (in my opinion) the contacts of the newly soldered RAM chips looked fine, soldering them off one by one did not fix the issue, and the most suspicious-looking contacts were not power-related.