Find file History
xobs hardware: rework layout and link to dvt/evt boards
This redoes a lot of the layout.  Furthermore, it distinguishes between
evt and dvt.

Signed-off-by: Sean Cross <sean@xobs.io>
Latest commit 4292370 Jan 16, 2019

README.asciidoc

Tomu FPGA - Hacker Version

Caution
This design is currently a work-in-progress and undergoing major revisions.

This directory contains the hacker version of the Tomu FPGA. The hacker version is designed for people who are up to the challenge of building their own board.

It has a simpler PCB which makes it cheaper to produce in a small quantities.

However, it uses a non-standard footprint for the FPGA WSCP which reduces yield and long term reliability making it unsuitable for mass production. Additionally, it has fewer power regulation components, which may impact stability.

PCB Specification

Caution
This PCB specification is currently a work-in-progress.

Board Size

0.37 x 0.51 inches (9.5 x 13.1mm)

Board thickness

0.6mm

Number of Layers

2

Components

Single Side

Silkscreen

None, one side or all sides is fine.

Number of through holes

0

Minimum trace width and clearance

4mil traces, 4mil clearance

Vias + Drills

0.2mm via drills with 0.5mm annular rings

Smallest pitch size

0201 resistors, WCSP parts

Control Impedance

Not required

Solder Mask color

Blue

Plating

ENIG

Material

FR4

Bill of Materials

  • TBD

Images

Fomu 0.0 board

PCB Specification

Caution
This PCB specification is currently a work-in-progress.

Board Size

0.37 x 0.51 inches (9.5 x 13.1mm)

Board thickness

0.6mm

Number of Layers

2

Components

Single Side

Silkscreen

None, one side or all sides is fine.

Number of through holes

0

Minimum trace width and clearance

4mil traces, 4mil clearance

Vias + Drills

0.2mm via drills with 0.5mm annular rings

Smallest pitch size

0201 resistors, WCSP parts

Control Impedance

Not required

Solder Mask color

Blue

Plating

ENIG

Material

FR4

Programming jig

Pogo-pin programming jig

V

Vcc

0.000 x 0.275 in

S

SPI_CS

0.000 x 0.160 in

C

SPI_CLK

0.000 x 0.0825 in

I

SPI_MISO

0.027 x 0.000 in

O

SPI_MOSI

0.100 x 0.000 in

R

RESET

0.170 x 0.000 in

G

GND

0.302 x 0.0000 in

Laser cut SVG for the programming jig for use with fomu-flash tools. The pinout works for both the Pi 2 and Pi 3.