HardLabs

SYZYGY SGMII

gregdavill·advent-calendar-of-circuits-2020·syzygy-txr-breakout/kicad-src/syzygy-txr-breakout.kicad_pcb

SYZYGY SGMII PCB layout, top view — open source AVR/Arduino board by gregdavill

About the SYZYGY SGMII PCB

SYZYGY SGMII is an open source AVR/Arduino PCB design by gregdavill, published on GitHub. It is a 4-layer board measuring 50 × 80 mm, with 31 components from 12 distinct parts.

Its main chip is the ATTINY44A-MMH, from the AVR/Arduino family. By type, the board carries 24 connectors, 3 capacitors, 2 resistors, 1 IC and 1 crystal.

It belongs with the dev boards & breakouts designs in this gallery.

From the project

1 circuit board design a day for 31 days.

SYZYGY is an FPGA expansion standard for medium to high speed interfaces. Learn more and check out the specifications here: https://syzygyfpga.io/

All 12 I/O pins broken out to a 0.1" header. All 4 TX/RX lanes and ref clock broken out to SMA connections

SYZYGY SGMII, from the project README
From the project README

Main components on the SYZYGY SGMII

ATTINY44A-MMH

SYZYGY SGMII bill of materials (BOM)

31 components, 12 distinct parts.

QtyPartRefs
1
ATTINY44A-MMH
ATtiny44A-MMH
U2
1
SG3225VAN
X1
1
SYZYGY-TXR-4
J1
18
sma jack
J2, J4, J5, J6, J7, J8, J13, J14 +10
1
TagConnect
J3
1
Conn_02x07_Odd_Even
J9
3
Conn_01x01_Male
J10, J11, J12
1
CL05B104KP5NNNC
0.1uF
C9
1
CL05A105KP5NNNC
1uF
C10
1
CC0402KRX5R6BB105
0.1uF
C32
1
RMCF0402FT10K0
10K
R15
1
RC0402FR-07100KL
100R
R16

SYZYGY SGMII design files

The KiCad project lives in the gregdavill/advent-calendar-of-circuits-2020 repository on GitHub; these links point at the commit this page was built from.

SYZYGY SGMII: common questions

What microcontroller does the SYZYGY SGMII use?

The SYZYGY SGMII is built around the ATTINY44A-MMH, from the AVR/Arduino family.

How big is the SYZYGY SGMII PCB?

The SYZYGY SGMII measures 50 × 80 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the SYZYGY SGMII?

31 components, from 12 distinct parts. The full bill of materials is listed on this page.

Where can I download the SYZYGY SGMII design files?

From the gregdavill/advent-calendar-of-circuits-2020 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the SYZYGY SGMII design in my own project?

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

Can I test firmware for the SYZYGY SGMII without the hardware?

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

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