HardLabs

Backplane

crempp·ucpu·cpu/Backplane-v0.1/Backplane.kicad_pcb

Backplane PCB layout, top view — open source board by crempp

About the Backplane PCB

Backplane is an open source PCB design by crempp, published on GitHub. It is a 2-layer board measuring 268 × 237.9 mm, with 139 components from 29 distinct parts.

Other key parts include the 74LS245, MCP100-450D and 74LS04. By type, the board carries 65 diodes, 31 connectors, 25 capacitors, 10 ICs and 8 resistors.

From the project

16bit CPU made from TTL Logic Chips

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)

Backplane, from the project README
From the project README

Main components on the Backplane

74LS245MCP100-450D74LS04

Backplane bill of materials (BOM)

139 components, 29 distinct parts.

QtyPartRefs
8
74LS245
U1, U2, U3, U4, U5, U6, U7, U8
1
MCP100-450D
U9
1
74LS04
U10
1
GPR_A
J1
1
GPR_B
J2
1
GPR_C
J3
1
GPR_D
J4
1
AReg_PC
J5
1
AReg_SP
J6
1
AReg_SI
J7
1
AReg_DI
J8
1
Pipeline
J9
1
ALU
J10
1
Memory
J11
4
Conn_01x16_Female
J12, J13, J14, J15
5
Conn_01x04_Female
J16, J17, J18, J19, J27
4
Conn_01x07_Female
J20, J21, J22, J23
1
Conn_01x05_Female
J24
1
Barrel_Jack
J25
1
Conn_01x14_Female
J28
Show 9 more
QtyPartRefs
1
IO_1
J29
1
IO_2
J30
1
IO_3
J31
1
IO_4
J32
64
LED_BLUE
D0, D1, D2, D3, D4, D5, D6, D7 +56
1
D_Zener
D64
9
0.1uF
C1, C2, C3, C4, C5, C6, C7, C8 +1
16
47uF
C10, C11, C12, C13, C14, C15, C16, C17 +8
8
220R
RN1, RN2, RN3, RN4, RN5, RN6, RN7, RN8

Backplane design files

The KiCad project lives in the crempp/ucpu repository on GitHub; these links point at the commit this page was built from.

Backplane: common questions

How big is the Backplane PCB?

The Backplane measures 268 × 237.9 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Backplane?

139 components, from 29 distinct parts. The full bill of materials is listed on this page.

Where can I download the Backplane design files?

From the crempp/ucpu repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Backplane design in my own project?

The repository has no license, so all rights stay with crempp. Use it as a reference, and ask the author before reusing the design.

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