HardLabs

MemoryModule

crempp·ucpu·cpu/Memory/MemoryModule.kicad_pcb

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

About the MemoryModule PCB

MemoryModule is an open source PCB design by crempp, published on GitHub. It is a 2-layer board measuring 197.8 × 80 mm, with 97 components from 14 distinct parts.

Other key parts include the AT28C64B-15PU, AS6C6264-55PCN, 74LS173, 74LS139 and 74LS04. By type, the board carries 32 diodes, 31 capacitors, 27 ICs, 4 resistors and 3 connectors.

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)

MemoryModule, from the project README
From the project README

Main components on the MemoryModule

AT28C64B-15PUAS6C6264-55PCN74LS17374LS13974LS0474LS0874LS245

MemoryModule bill of materials (BOM)

97 components, 14 distinct parts.

QtyPartRefs
4
AT28C64B-15PU
U1, U2, U3, U4
12
AS6C6264-55PCN
U5, U6, U7, U8, U9, U10, U11, U12 +4
1
74LS173
U17
2
74LS139
U18, U19
1
74LS04
U20
3
74LS08
U21, U22, U23
4
74LS245
U24, U25, U26, U27
1
Interconnect
J1
1
Expansion Connector A
J2
1
Expansion Connector B
J3
32
LED
D1, D2, D3, D4, D5, D6, D7, D8 +24
27
1uf
C1, C2, C3, C4, C5, C6, C7, C8 +19
4
10uf
C41, C42, C43, C44
4
220R
RN1, RN2, RN3, RN4

MemoryModule design files

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

MemoryModule: common questions

How big is the MemoryModule PCB?

The MemoryModule measures 197.8 × 80 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the MemoryModule?

97 components, from 14 distinct parts. The full bill of materials is listed on this page.

Where can I download the MemoryModule 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 MemoryModule 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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