2 layers177 × 121.9 mm
2 layers268 × 237.9 mm
Backplane
crempp/ucpu416bit CPU made from TTL Logic Chips
- Size
- 268 × 237.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 139
- Nets
- 1,129
- Pads
- 2,449
- Tracks, vias
- 5,887, 369
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 28 Nov 2020
- Updated
- 26 Feb 2022
Overview
Backplane is an open-source printed circuit board by crempp, from the crempp/ucpu repository on GitHub. It is a 2-layer board of 268 × 237.9 mm with 139 parts on 1,129 nets, routed with 5,887 tracks and 369 vias.
It is built around the 74LS245SC, 74LS04PC and MCP100-450DI/TO. Its parts include 65 diodes, 31 connectors, 25 capacitors and 10 ICs.
Main components
374LS245SC
-0℃~+70℃ 12ns@5V,45pF 15mA 24mA 4.75V~5.25V 74LS 8 Bidirectional Output enable Schmitt trigger Tri-State - Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
74LS04PC
PDIP-140℃~+70℃ 4.75V~5.25V 6 6.6mA 74LS PDIP-14 InvertersonsemiInverters
MCP100-450DI/TO
TO-92-3-40℃~+85℃@(TA) 1 150ms 1V~5.5V 4.375V 45uA Active Low Push-pull Simple Reset/Power-On Reset TO-92-3 Supervisor and Reset ICs ROHSMicrochip TechnologySupervisor And Reset ICs
README
README.mduCPU
This is a 16bit pipelined CPU designed on a breadboard and produced in modular component boards.
My objective in this project is to learn electronics, CPU design and build a fully functional CPU that can be updated, added to and further developed easily.
The CPU is designed around
- four general purpose 16 bit registers
- four 16 bit address registers
- ALU supporting addition, subtraction, shift and bitwise operations
- piplined instructions
- banked memory with a base of 64k, expandable to about 1.5 megabytes (max TBD)
Documentation
Documentation is located here
Parts
139| Qty | Value | Footprint | References |
|---|---|---|---|
| 64 | LED_BLUE | LED_SMD:LED_1206_3216Metric_Pad1.42x1.75mm_HandSolder | D0, D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22 +48 |
| 16 | 47uF | Capacitor_SMD:CP_Elec_4x5.4 | C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24, C25 |
| 9 | 0.1uF | Capacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolder | C1, C2, C3, C4, C5, C6, C7, C8, C9 |
| 8 | 220R | Resistor_SMD:R_Array_Convex_8x0602 | RN1, RN2, RN3, RN4, RN5, RN6, RN7, RN8 |
| 8 | 74LS245 | Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm | U1, U2, U3, U4, U5, U6, U7, U8 |
| 5 | Conn_01x04_Female | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J16, J17, J18, J19, J27 |
| 4 | Conn_01x07_Female | Connector_PinHeader_2.54mm:PinHeader_1x07_P2.54mm_Vertical | J20, J21, J22, J23 |
| 4 | Conn_01x16_Female | Connector_PinHeader_2.54mm:PinHeader_1x16_P2.54mm_Vertical | J12, J13, J14, J15 |
| 1 | 74LS04 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U10 |
| 1 | ALU | TE-PCI-32bit:TE_1-5145154-2 | J10 |
| 1 | AReg_DI | TE-PCI-32bit:TE_1-5145154-2 | J8 |
| 1 | AReg_PC | TE-PCI-32bit:TE_1-5145154-2 | J5 |
| 1 | AReg_SI | TE-PCI-32bit:TE_1-5145154-2 | J7 |
| 1 | AReg_SP | TE-PCI-32bit:TE_1-5145154-2 | J6 |
| 1 | Barrel_Jack | digikey-footprints:Barrel_Jack_5.5mmODx2.1mmID_PJ-202A | J25 |
| 1 | Conn_01x05_Female | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | J24 |
| 1 | Conn_01x14_Female | Connector_PinHeader_2.54mm:PinHeader_1x14_P2.54mm_Vertical | J28 |
| 1 | D_Zener | Diode_THT:D_A-405_P10.16mm_Horizontal | D64 |
| 1 | GPR_A | TE-PCI-32bit:TE_1-5145154-2 | J1 |
| 1 | GPR_B | TE-PCI-32bit:TE_1-5145154-2 | J2 |
| 1 | GPR_C | TE-PCI-32bit:TE_1-5145154-2 | J3 |
| 1 | GPR_D | TE-PCI-32bit:TE_1-5145154-2 | J4 |
| 1 | IO_1 | TE-PCI-32bit:TE_1-5145154-2 | J29 |
| 1 | IO_2 | TE-PCI-32bit:TE_1-5145154-2 | J30 |
| 1 | IO_3 | TE-PCI-32bit:TE_1-5145154-2 | J31 |
| 1 | IO_4 | TE-PCI-32bit:TE_1-5145154-2 | J32 |
| 1 | MCP100-450D | digikey-footprints:SOT-23-3 | U9 |
| 1 | Memory | TE-PCI-32bit:TE_1-5145154-2 | J11 |
| 1 | Pipeline | TE-PCI-32bit:TE_1-5145154-2 | J9 |
Questions
How big is the Backplane PCB?
It measures 268 × 237.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Backplane use?
139 parts, built around the 74LS245SC, 74LS04PC and MCP100-450DI/TO. 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 Backplane KiCad files?
From the crempp/ucpu repository on GitHub, at the commit this page was made from: the board is cpu/Backplane/Backplane.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Backplane design in my own project?
Its repository states no licence, so its author keeps all rights: ask crempp before reusing the design.
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