HardLabs

CPU

eigenco·frankenpi·KiCad/CPU.kicad_pcb

CPU PCB layout, top view — open source Raspberry Pi board by eigenco

About the CPU PCB

CPU is an open source Raspberry Pi PCB design by eigenco, published on GitHub. It is a 2-layer board measuring 102.8 × 73.8 mm, with 18 components from 8 distinct parts.

Its main chip is the Raspberry_Pi_2_3, from the Raspberry Pi family. Other key parts include the 74LS688. By type, the board carries 8 resistors, 7 connectors, 1 IC and 1 capacitor.

From the project

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.

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…

Main components on the CPU

74LS688

CPU bill of materials (BOM)

18 components, 8 distinct parts.

QtyPartRefs
1
74LS688
U19
4
Conn_02x08_Odd_Even
J1, J2, J3, J66
1
Conn_02x09_Odd_Even
J4
1
Bus_ISA_8bit
J5
1
Raspberry_Pi_2_3
J6
1
TOTX1350(F)
TOTX1350_F_
CS1
1
0.1u
C1
8
10k
R1, R2, R3, R4, R5, R6, R7, R8

CPU design files

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

CPU: common questions

What microcontroller does the CPU use?

The CPU is built around the Raspberry_Pi_2_3, from the Raspberry Pi family.

How big is the CPU PCB?

The CPU measures 102.8 × 73.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the CPU?

18 components, from 8 distinct parts. The full bill of materials is listed on this page.

Where can I download the CPU design files?

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

Can I use the CPU design in my own project?

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

Can I test firmware for the CPU without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug Raspberry Pi firmware against it before you order a PCB.

More boards in frankenpi

Similar boards