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100 lines
5.3 KiB
Markdown
100 lines
5.3 KiB
Markdown
# GottaGoFaZt3r Fast RAM
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256MB Autoconfig Fast RAM for the Amiga 3000/4000
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## Table of contents
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1. [Status](#status)
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2. [Features](#features)
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3. [Ordering PCBs](#ordering-pcbs)
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4. [Bill of materials](#bill-of-materials)
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5. [Troubleshooting](#troubleshooting)
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6. [Special Thanks and Shoutouts](#special-thanks-and-shoutouts)
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7. [License](#license)
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## Status
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Tested and working in the following configurations:
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* Amiga 3000
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* Amiga 4000 with A3640
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## Features
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128MB or 256MB Z3 Fast RAM
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Brand new 32Mx16 SDRAM chips are quite expensive so the board can also be fitted with 16Mx16 chips for a much lower build cost
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## Ordering PCBs
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I recommend ordering from JLCPCB as this board was designed within their 4-layer specifications
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Recommended options when ordering:
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* Thickness: 1.6mm
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* Surface Finish: ENIG-RoHS
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* Gold Fingers: Yes
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* 45°finger chamfered: Yes
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Layer sequence:
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|Layer|File|
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|-|-|
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|L1|GottaGoFaSDZ3-F_Cu.gbr|
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|L2|GottaGoFaSDZ3-In1_Cu.gbr|
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|L3|GottaGoFaSDZ3-In2_Cu.gbr|
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|L4|GottaGoFaSDZ3-B_Cu.gbr|
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## Bill of materials
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|Component|Location|QTY|Link|Notes|
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|---------|--------|---|----|-----|
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|0.1uF Ceramic Capacitor, 0603|C4-15,C17-44|40|[Mouser](https://www.mouser.com/ProductDetail/80-C603C104K5RAC3121)<br />[DigiKey](https://www.digikey.com/short/f7trtfwt)||
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|10uF Ceramic Capacitor, 1206|C2-3,C16|3|[Mouser](https://www.mouser.com/ProductDetail/187-CL31A106MAHNNNE)<br />[DigiKey](https://www.digikey.com/short/rqt1br0q)||
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|33 Ohm Resistor, 0603|R1|1|[Mouser](https://www.mouser.com/ProductDetail/603-RT0603DRE0733RL)<br />[DigiKey](https://www.digikey.com/short/40rdd4m1)||
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|33 Ohm Resistor network, Convex 1206 (3.2x1.6mm)|RN1-8|8|[Mouser](https://www.mouser.com/ProductDetail/667-EXB-38V330JV)<br />[DigiKey](https://www.digikey.com/short/t08zh4pn)||
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|10K Resistor, 0603|R2|1|[Mouser](https://www.mouser.com/ProductDetail/603-RT0603FRD0710KL)<br />[DigiKey](https://www.digikey.com/short/nvvrt5dw)||
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|LM1117-3.3 SOT-223|U1|1|[Mouser](https://www.mouser.com/ProductDetail/926-LM1117IMP3.3NOPB)<br />[Digikey](https://www.digikey.se/short/jprv7r4q)||
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|74LVC245N TSSOP|U2-5|4|[Mouser](https://www.mouser.com/ProductDetail/595-SN74LVC245APWT)<br />[DigiKey](https://www.digikey.se/short/vbmphn44)|Can be substituted with SN74LVTH245 or SN74LVCR2245|
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|AS4C32M16SC 32Mx16 SDRAM, TSSOP-54|U7-10|4|[Mouser](https://www.mouser.com/ProductDetail/913-AS4C32M16SC-7TIN)<br />[DigiKey](https://www.digikey.com/short/wfwn8nmw)|Cheaper option is to use [A3V56S40GTP](https://www.mouser.com/ProductDetail/155-A3V56S40GTP-60) 16Mx16 for a 128MB configuration at a drastically lower price, or scavenge some 32Mx16 SDRAM from old SODIMMs*|
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|Xilinx XC95144XL-10TQG100C 10ns 144 Macrocell CPLD|U6|1|[Mouser](https://www.mouser.com/ProductDetail/217-95144XL-10TQ100C)<br />[Digkey](https://www.digikey.com/short/w0r0j288)||
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|Clock Oscillator, HCMOS, 7x5mm, 3.3V, ~66MHz|X1|1|[Mouser](https://www.mouser.com/ProductDetail/959-SM7745HEV-66.667)<br />[DigiKey](https://www.digikey.com/short/q8bzfwj4)|Anything close to 66MHz should work<br />Tested at 66.6666MHz|
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__*__ I cannot provide technical support for RAM chips other than those explicitly listed in the BOM, others may work but you're on your own
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## Troubleshooting
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__Problem:__ The board is detected but there is less memory detected than there should be. or you see a message stating that the board is "Defective"
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__Resolution:__
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1. Check all soldering looking for bad connections and shorts around the RAM and CPLD
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2. Test the RAM using [ATK](https://github.com/keirf/amiga-stuff/releases)
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Look for the relevant region under "List and test regions" and test it
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Consult the memory layout to determine which IC is responsible for any stuck bits you might see
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### Memory Layout
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The memory is laid out in a way that causes it to wrap around above 128MB when only 128MB of ram is fitted to the card allowing either 128/256MB configuration with the same CPLD firmware.
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Kickstart will notice this wrap and add only 128MB to the free pool in this instance.
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|Address|D0-15|D16-31|
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|-------|-----|------|
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|40000000-43FFFFFF|U9|U7|
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|44000000-47FFFFFF|U10|U8|
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|48000000-4BFFFFFF|U9|U7|
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|4C000000-4FFFFFFF|U10|U8|
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## Special Thanks and Shoutouts
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* [Niklas Ekström](https://github.com/niklasekstrom) for helping to clean up my messy code
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* [GadgetUK164](https://www.youtube.com/gadgetuk164) for ~~being a guinea pig~~ beta testing many of my boards
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* SparxUK also for being a helpful beta tester of many of my boards
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* [CDH](https://github.com/cdhooper) and [Stefan Reinauer](https://github.com/reinauer) for helping me to get my A3000 going
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* [Rob "peepo" Taylor](https://tindie.com/stores/bobsbits/) whose A500++ got me started on my journey of tinkering with Amigas
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* [jbilander](https://github.com/jbilander) who came up with the cool name :)
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* RetroFletch
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* [SukkoPera](https://github.com/SukkoPera)
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## License
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[![CC BY-SA 4.0][cc-by-sa-shield]][cc-by-sa]
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This work is licensed under a
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[Creative Commons Attribution-ShareAlike 4.0 International License][cc-by-sa].
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[![CC BY-SA 4.0][cc-by-sa-image]][cc-by-sa]
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[cc-by-sa]: http://creativecommons.org/licenses/by-sa/4.0/
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[cc-by-sa-image]: https://licensebuttons.net/l/by-sa/4.0/88x31.png
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[cc-by-sa-shield]: https://img.shields.io/badge/License-CC%20BY--SA%204.0-lightgrey.svg
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