4 layers38 × 38 mm
4 layers78 × 49 mm
ReAgnus MegAChip
jbilander/ReAgnus-MegAChip33A ReAgnus MegaAChip PCB that takes a Gowin FPGA with embedded PSRAM, a PLCC-84 plug and FET level shifters.
- Size
- 78 × 49 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 57
- Nets
- 226
- Pads
- 668
- Tracks, vias
- 2,152, 230
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 22 Aug 2022
- Updated
- 27 Jan 2025
Overview
ReAgnus MegAChip is an open-source printed circuit board by jbilander, from the jbilander/ReAgnus-MegAChip repository on GitHub, published under the CC-BY-SA-4.0 licence. It is a 4-layer board of 78 × 49 mm with 57 parts on 226 nets, routed with 2,152 tracks and 230 vias.
It is built around the 74LVC1G07, 74LVC245AD and SN74CBT16210DL, with the 74LVC1GX04GV, LM1117-3.3 and TPS73643DBV among its other parts. Its parts include 30 capacitors, 13 ICs, 5 resistors, 4 connectors and 1 inductor. It belongs with the fPGA and programmable logic boards and the FPGA and CPLD boards of this library.
Main components
6
74LVC1G07
SOT-353-40℃~+105℃ 1 1 1.65V~5.5V 1.6ns@5.5V,50pF 24mA 4uA 74LVC Open-drain Power-off isolation、Level shifting Unidirectional SOT-353 Buffers, Drivers, Receivers, Transceivers ROHSWuxi I-core ElecBuffers, Drivers, Receivers, Transceivers
74LVC245AD
SOIC-20-300mil-40℃~+125℃ 1 1.65V~3.6V 2.9ns@3.3V,50pF 24mA 40uA 74LVC 8 Bidirectional Schmitt trigger Tri-State SOIC-20-300mil Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffer/Driver/Transceiver
SN74CBT16210DL
SSOP-48-300mil-40℃~+85℃ 20 250ps 4V~5.5V 5Ω SSOP-48-300mil Analog Switches, Multiplexers ROHSTexas InstrumentsAnalog Switches, Multiplexers
74LVC1GX04GV
SC-74SC-74 Specialty Logic ROHSNexperiaSpecialty Logic
LM1117-3.3
SOT-2231 1.3V@(1000mA) 15V 1A 2mA 3.3V Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHShongjiachengUncategorised
TPS73643DBV
SOT-23-5-40℃~+125℃@(Tj) 1 200mV@(400mA) 30uVrms 4.3V 400mA 5.5V 550uA 58dB@(100Hz) Fixed Over Current Protection、Over Temperature Protection Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
README.mdReAgnus-MegAChip
A ReAgnus MegaAChip PCB that takes a Gowin FPGA with embedded PSRAM, a PLCC-84 plug and FET level shifters.
THIS IS WORK IN PROGRESS, HARDWARE IS VERIFIED WORKING. FIRMWARE YET TO BE DEVELOPED. BUILD AT YOUR OWN RISK.
For hi-res pics goto the hi-res folder in pics https://github.com/jbilander/ReAgnus-MegAChip/tree/main/pics/hi-res
BOM Rev. 2C
| Designator | Name/Value | Package | Notes |
|---|---|---|---|
| U1 | Gowin FPGA GW1NR-UV9LQ144PC6/I5 | LQFP-144 | FPGA - Field Programmable Gate Array, 8640 LE, 121 I/O, Embedded 64Mbit 16-bit PSRAM GW1NR-UV9LQ144PC6/I5 |
| U2 | Voltage Regulator 3.3V, LM1117-3.3 or AMS1117-3.3 | SOT-223 | 3.3V 1A Low Drop-Out (LDO) Voltage regulator. https://www.aliexpress.com/item/32869037691.html |
| U3 | Voltage Regulator 4.3V, TPS73643DBVR or ABLIC S-1132B43-M5T1U | SOT-23-5 | 4.3V LDO Voltage Regulator TPS73643DBVR S-1132B43-M5T1U |
| U4,U5,U6,U7 | Digital Bus Switch ICs 20-Bit FET, SN74CBT16210CDGVR | TVSOP-48 | FET Level-shifter SN74CBT16210CDGVR |
| U8 | 74LVC1G07 Single Buffer With Open-Drain Output | SOT-353, SC-70-5 | 74LVC1G07 |
| U9 | X-tal driver 74LVC1GX04 | TSOP-6 1.65x3.05mm P0.95mm | 74LVC1GX04 |
| U10 | Bus Transceiver 74LVC245APW,118 | TSSOP-20 | 74LVC245APW-T |
| U11 | Voltage Regulator 1.8V, MCP1702T-1802E/CB | SOT-23 | 1.8V Low Drop-Out (LDO) Voltage regulator. MCP1702T1802E-CB |
| U12 | Winslow PLCC-84 Plug | PLCC-84 Plug | Optionally homemade plug |
| U13 | PLCC-84_TH_pin_holes | Agnus_TH_plug_pins | Pins to use with homemade plug, 1.27mm pitch Long Pin 1x40P or 1x50P Aliexpress Cut to length after soldering. |
| Y1 | 18pF Crystal 28.6363 MHz (NTSC) or 28.375 MHz (PAL) | 3.2 mm x 2.5 mm | ECS-286.3-18-33-JEM-TR (NTSC) ABM8-28.375MHZ-B2-T (PAL) |
| R1 | Resistor 1k Ω | 0603 | Resistor in optional Oscillator-circuit |
| R2 | Resistor 2.2M Ω | 0603 | Resistor in optional Oscillator-circuit |
| R3 | Resistor 33 Ω | 0603 | Series resistor for CLK from U9 to avoid reflections (in optional Oscillator-circuit). |
| R4 | Resistor 10k Ω | 0603 | Pull-up resistor for pin 41 (PAL/NTSC-selector for A500 Rev.6A/A2000/A3000-pinout) since A500 Rev.6A doesn't have pull-up on motherboard like A2000/A3000/A3000T have. Only needed for A500 Rev.6A. but doesn't hurt to populate anyway. |
| R5 | Resistor 4.7k Ω | 0603 | Pull-down resistor for TCK in JTAG. |
| RN1 | 4.7k or 10k Ω RES ARRAY 4 Resistors | 1206 | CAY16-4701F4LF or CAY16-103J4LF |
| RN2 | 4.7k (CAY16-4701F4LF) RES ARRAY 4 Resistors | 1206 | CAY16-4701F4LF |
| C1 | Capacitor Radial Polarized 100uF | 2.5mm pitch, Through-Hole | ECE-A0JKA101I |
| C2-C4 | Capacitor 10uF | 1206 | |
| C5 | Capacitor 1uF | 0805 | |
| C6 | Capacitor 10uF | 0805 | |
| C9 | Capacitor 1uF | 0805 | |
| C7,C8,C10-C16 | Capacitor 0.1uF = 100nF | 0805 | |
| C17-C19 | Capacitor 0.01uF = 10nF | 0805 (or 0603) | |
| C20 | Capacitor 0.1uF = 100nF | 0603 | Decoupling cap for U8 |
| C21-C24 | Capacitor 0.1uF = 100nF | 0603 | Decoupling caps for U4-U7 |
| C25 | Capacitor 0.1uF = 100nF | 0603 | Optional cap for U3, NR (Noise Reduction) pin 4 on TPS73643DBVR, this pin is NC on ABLIC S-1200B43-M5T1U |
| C26 | Capacitor 0.01uF = 10nF | 0603 | |
| C27-C28 | Capacitor 0.1uF = 100nF | 0603 | |
| C29-C30 | Multilayer Ceramic Capacitors MLCC - 32pF | 0603 | 06031A320FAT2A Caps for optional oscillator circuit |
| L1 | (Ferrite Bead 600ohms 100MHz .5A Monolithic) or 0 Ω resistor | 0805 | HZ0805E601R-10 or 0 Ω resistor |
| J1 | VCC/GND Power Header Male | TH 1 x 2 Pin, 2.54mm pitch | For external power supply to allow programming of device when not plugged into the Amiga socket. |
| J2 | JTAG Pin Header Male | TH 2 x 5 Pin, 2.54mm pitch | |
| J3 | A20-A23 Pin Header Male | TH 2 x 2 Pin, 2.00mm pitch | Input Address lines for jumper-wires A20-A23 |
| J4 | GND MountingHole_2.2mm_M2_Pad_Via | nut and bolt M2 size | for solid grounding via a ring lug connector and a thick jumper wire to Motherboard |
Select one of the crystals 28.375 MHz (PAL) or 28.6363 MHz for the optional onboard oscillator circuit. Probably you want to select PAL/NTSC opposite to what your CLK on motherboard has, this in order to be able to switch between native PAL/NTSC with only a JP-setting on the MegaChip board.
Parts
57| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 0.1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C7, C8, C10, C11, C12, C13, C14, C15, C16 |
| 4 | 0.1uF (0603) | Capacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolder | C21, C22, C23, C24 |
| 4 | SN74CBT16210 | Package_SO:TSSOP-48_4.4x9.7mm_P0.4mm | U4, U5, U6, U7 |
| 3 | 0.01uF | Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C17, C18, C19 |
| 3 | 0.1uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C25, C27, C28 |
| 2 | 0.01uF | Capacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolder | C20, C26 |
| 2 | 10uF | Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C2, C3 |
| 2 | 32pF | Capacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolder | C29, C30 |
| 2 | 4.7k | Agnus:RESCAF80P320X160X60-8N | RN1, RN2 |
| 1 | 100uF Radial Pitch_2.5mm | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C1 |
| 1 | 10kΩ | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R4 |
| 1 | 10uF | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C4 |
| 1 | 10uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C6 |
| 1 | 1kΩ | Resistor_SMD:R_0603_1608Metric_Pad1.05x0.95mm_HandSolder | R1 |
| 1 | 1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C5 |
| 1 | 1uF (0805) | Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C9 |
| 1 | 2.2MΩ | Resistor_SMD:R_0603_1608Metric_Pad1.05x0.95mm_HandSolder | R2 |
| 1 | 33Ω | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R3 |
| 1 | 4.7k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R5 |
| 1 | 600 | Inductor_SMD:L_0805_2012Metric_Pad1.05x1.20mm_HandSolder | L1 |
| 1 | 74LVC1G07 | Agnus:SOT-353_SC-70-5_Custom_Handsoldering | U8 |
| 1 | 74LVC1GX04 | Package_SO:TSOP-6_1.65x3.05mm_P0.95mm | U9 |
| 1 | 74LVC245A | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U10 |
| 1 | Agnus_TH_plug_pins | Agnus:PLCC-84_TH_pin_holes | U13 |
| 1 | CL=16pF | Crystal:Crystal_SMD_SeikoEpson_FA238-4Pin_3.2x2.5mm | Y1 |
| 1 | Conn_01x01 | MountingHole:MountingHole_2.2mm_M2_Pad_Via | J4 |
| 1 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1 |
| 1 | Conn_02x02_Odd_Even | Connector_PinHeader_2.00mm:PinHeader_2x02_P2.00mm_Vertical | J3 |
| 1 | Conn_02x05_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x05_P2.54mm_Vertical | J2 |
| 1 | GW1NR-UV9LQ144P | Package_QFP:LQFP-144_20x20mm_P0.5mm | U1 |
| 1 | LM1117-3.3 | Package_TO_SOT_SMD:SOT-223 | U2 |
| 1 | MCP1702T-1802E_CB | Package_TO_SOT_SMD:SOT-23_Handsoldering | U11 |
| 1 | PLCC-84-Plug | Agnus:PLCC-84_Plug_P1.27mm_mirrored | U12 |
| 1 | TPS73643DBV | Package_TO_SOT_SMD:SOT-23-5 | U3 |
The 56 most common of 57 parts.
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Questions
How big is the ReAgnus MegAChip PCB?
It measures 78 × 49 mm and has 4 copper layers, 1.6 mm thick.
What parts does the ReAgnus MegAChip use?
57 parts, built around the 74LVC1G07, 74LVC245AD, SN74CBT16210DL and 74LVC1GX04GV. 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 ReAgnus MegAChip KiCad files?
From the jbilander/ReAgnus-MegAChip repository on GitHub, at the commit this page was made from: the board is KiCad/ReAgnus-MegAChip.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the ReAgnus MegAChip design in my own project?
Its repository publishes it under the CC-BY-SA-4.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).