2 layers104.1 × 71.1 mm
Minifp
eigenco/frankenpi
This is an experimental project to connect Raspberry Pi with the help of cheap Cyclone IV FPGA board to 8-bit ISA bus to act as multiple different devices.
49 parts139
2 layers104.1 × 71.1 mm
Minifp
eigenco/frankenpi139This is an experimental project to connect Raspberry Pi with the help of cheap Cyclone IV FPGA board to 8-bit ISA bus to act as multiple different devices.
- Size
- 104.1 × 71.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 69
- Nets
- 176
- Pads
- 440
- Tracks, vias
- 763, 151
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 17 Jul 2022
- Updated
- 11 Nov 2023
Overview
Minifp is an open-source printed circuit board by eigenco, from the eigenco/frankenpi repository on GitHub. It is a 2-layer board of 104.1 × 71.1 mm with 69 parts on 176 nets, routed with 763 tracks and 151 vias.
It is built around the ICE40HX4K-TQ144, AMS1117-1.2 and AMS1117-3.3, with the IS61WV10248EDBLL-10TLI and K66X-E15S-N among its other parts. Its parts include 22 capacitors, 21 resistors, 4 ICs, 4 connectors and 1 crystal. It belongs with the FPGA and CPLD boards of this library.
Main components
5
ICE40HX4K-TQ144
TQFP-144(20x20)-40℃~+100℃ 1.14V~1.26V 107 3520 440 81920bit iCE40 HX TQFP-144(20x20) Programmable Logic Device (CPLDs/FPGAs) ROHSLatticeProgrammable Logic Device (CPLDs/FPGAs)
AMS1117-1.2
SOT-223-40℃~+125℃@(Tj) 0.003%Vout 1 1.2V 1.3V@(1A) 10mA 18V 1A 60dB@(120Hz) Fixed Over Current Protection Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSUMWVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsAMS1117-3.3
SOT-223-40℃~+125℃ 0.003%Vout 1 1.1V@(800mA) 15V 1A 3.3V 5mA 72dB@(120Hz) Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAdvanced Monolithic SystemsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
IS61WV10248EDBLL-10TLI
TSOPII-44-10.2mm-40℃~+85℃ 10ns 15mA 2.4V~3.6V 55mA 8Mbit Auto power-down function、Built-in ECC function Parallel Port (Parallel) TSOPII-44-10.2mm SRAM ROHSISSISRAMK66X-E15S-N
弯插D-Sub / VGA ConnectorsKycon
README
README.mdfrankenpi
This is an experimental project to connect Raspberry Pi with the help of cheap Cyclone IV FPGA board to 8-bit ISA bus to act as multiple different devices.
What is currently implemented (to some degree), i.e. PC can access through ISA
- Mass storage access from a file on the Raspberry Pi (written sectors are flushed every 2 seconds by default)
- Adlib output to optical SPDIF
- Sound Blaster 8-bit mono with DMA and IRQ (basic functions only), output to optical SPDIF
- Gravis Ultrasound (basic wavetable only), output to optical SPDIF
- Roland MT-32 (UART only), output to optical SPDIF
- USB mouse plugged into the Raspberry Pi will appear as a kind of serial mouse in DOS, custom ctmouse driver is provided (start with /v)
- Boot from custom TVGA9000i VGABIOS, i.e. no other devices are required to be present in the ISA bus besides FrakenPi and VGA-adapter
Youtube links:
https://www.youtube.com/watch?v=1ej76w8sHxY
https://www.youtube.com/watch?v=CkwgHHmKaSI
TESTED and working:
- Wolfenstein 3D (SB & Adlib)
- Second Reality (GUS)
- Scream Tracker 3.21 (SB1 and GUS)
- Skyroads (SB & Adlib)
- Keen 4 (Adlib)
- Monkey Island (Adlib/MT32/Mouse)
- Space Quest 3 (Adlib/Mouse)
- Space Quest 4 (Adlib/MT32/Mouse)
- Lotus 3 (Adlib)
- Lemmings (Adlib/Mouse)
- Eye of the Beholder I & II (Adlib/Mouse)
- Indiana Jones and the Fate of Atlantis (Adlib/MT32/Mouse)
Planned
- General MIDI
- MPU-401 support
- Sound Blaster AWE32 wavetable support
- Standard ATA at ports 1f0h-1f7h
- Compatibility improvements
- Boot ROM in the FPGA so hacked VGABIOS isn't required
- VGA output
Used resources
- Harddisk: ports 170h-171h
- SoundBlaster: ports 22ah-22eh corresponding ot base address of 220h, IRQ 7 and DMA 1
- MT32: 330h-331h
- Gravis Ultrasound: ports 341h-347h corresponding to base address of 240h
- Adlib: ports 388h-389h (standard)
- Mouse: port 3f8h and IRQ 4 (COM1)
- Bootcode for custom int 13h resides in hacked VGABIOS at the end of C0000-C7FFF memory region
Further explanation
- Outgoing port operations are transferred from the FPGA to the Raspberry Pi GPIO using dedicated unidirectional 8-bit data bus
- Incoming data from the Raspberry Pi GPIO (PCM, harddisk, mouse) is transferred using dedicated unidirectional 8-bit data bus
- Raspberry Pi: CPU0 handles hdd flushing and mouse, CPU1 handles GPIO transfers, CPU2 handles Adlib, Gravis Ultrasound and MT32 (software selected)
- Raspberry Pi operates with CPU1-CPU3 in isolated mode, all CPUs run at constant 1 GHz and sched_rt_runtime_us is -1
- Raspberry Pi generates sound data 64 samples at a time (16-bit stereo corresponds to 256 bytes it must transfer every 1.45ms or so)
- SPDIF is running in 24-bit 44100 Hz Stereo
- Hardcoded harddisk type is CHS 256/16/63, i.e. approx. 126MiB
Plan for the next PCB
- ICE40HX8K-CT256 (FPGA) seems to be available at Mouser
- IS61WV102416FBLL-10TLI (2 MByte SRAM) seem to be available at Mouser
- Created KiCAD project (PCB_v2)
Parts
69| Qty | Value | Footprint | References |
|---|---|---|---|
| 18 | 100n | Capacitor_SMD:C_0603_1608Metric | C1, C2, C3, C4, C5, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20 +2 |
| 17 | , , , , , , , , , , , , , , , +1 | ||
| 6 | 1k1 | Resistor_SMD:R_0603_1608Metric | R2, R3, R9, R10, R16, R17 |
| 4 | 10u | Capacitor_SMD:C_0603_1608Metric | C201, C202, C203, C204 |
| 3 | 18k | Resistor_SMD:R_0603_1608Metric | R7, R14, R21 |
| 3 | 1k | Resistor_SMD:R_0603_1608Metric | R1, R8, R15 |
| 3 | 2k2 | Resistor_SMD:R_0603_1608Metric | R4, R11, R18 |
| 3 | 4k3 | Resistor_SMD:R_0603_1608Metric | R5, R12, R19 |
| 3 | 9k1 | Resistor_SMD:R_0603_1608Metric | R6, R13, R20 |
| 1 | 830207044109 | BasicISA8:830207044109 | Y1 |
| 1 | AMS1117-1.2 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U602 |
| 1 | AMS1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U601 |
| 1 | Bus_ISA_8bit | BasicISA8:Conn_Bus_ISA8 | J1 |
| 1 | Conn_02x08_Odd_Even | Connector_PinHeader_1.27mm:PinHeader_2x08_P1.27mm_Vertical | J2 |
| 1 | ICE40HX4K-TQ144 | Package_QFP:TQFP-144_20x20mm_P0.5mm | U2 |
| 1 | IS61WV10248EDBLL-10TLI | MODELS:SOP80P1176X120-44N | IC1 |
| 1 | K66X-E15S-N | BasicISA8:K66XE15SN | J401 |
| 1 | Raspberry_Pi_2_3 | Connector_PinHeader_2.54mm:PinHeader_2x20_P2.54mm_Vertical | J4 |
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Questions
How big is the Minifp PCB?
It measures 104.1 × 71.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Minifp use?
69 parts, built around the ICE40HX4K-TQ144, AMS1117-1.2, AMS1117-3.3 and IS61WV10248EDBLL-10TLI. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Minifp KiCad files?
From the eigenco/frankenpi repository on GitHub, at the commit this page was made from: the board is ice40HX4K/minifp.kicad_pcb and its schematic KiCad/CPU.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Minifp design in my own project?
Its repository states no licence, so its author keeps all rights: ask eigenco before reusing the design.