HardLabs

Pet on a chip

ept221·pet-on-a-chip·pcb/pet on a chip/pet on a chip.kicad_pcb

Pet on a chip PCB layout, top view — open source FPGA board by ept221

About the Pet on a chip PCB

Pet on a chip is an open source FPGA PCB design by ept221, published on GitHub under the MIT license. It is a 4-layer board measuring 76.2 × 63.5 mm, with 67 components from 28 distinct parts.

Its main chip is the ICE40HX8K-BG121, from the FPGA family. Other key parts include the 93LCxxC, FT2232HL, LDL1117S33R, TLV70012DDCR and N25Q032A13ESC40F. By type, the board carries 28 capacitors, 21 resistors, 7 ICs, 4 connectors, 2 crystals and 2 switches.

It belongs with the robotics & motion designs in this gallery.

From the project

Senior Design

To upload the configuration bitstream for the previously assembled program, run:

You will now be able to interact with a basic shell over the UART at 115200 baud. Additionally, the output will also be sent over the VGA interface.

There are a variety of memory mapped peripherals included in the system. The memory map is configured in soc/src/dramandio/dramandio.v. Currently addresses 0x0000 to 0x07FF are mapped to data ram. The peripherals are mapped from 0x1000 to 0x10FF. The instructions in and out are designed to allow for quickly and easily reading and writing to peripherals within this…

Pet on a chip, from the project README
From the project README

Main components on the Pet on a chip

93LCxxCFT2232HLLDL1117S33RTLV70012DDCRN25Q032A13ESC40FICE40HX8K-BG121L77HDE15SD1CH4F

Pet on a chip bill of materials (BOM)

67 components, 28 distinct parts.

QtyPartRefs
1
93LCxxC
U1
1
FT2232HL
U2
1
LDL1117S33R
U3
1
TLV70012DDCR
U4
1
N25Q032A13ESC40F
U5
1
ICE40HX8K-BG121
U6
1
L77HDE15SD1CH4F
U7
2
ASTX-H11
X1, X2
1
USB_B
J1
1
Screw_Terminal_01x02
J2
2
Conn_02x15_Odd_Even
J3, J4
2
LED
RX1, TX1
2
SW_Push
SW1, SW2
1
LED
D1
16
0.1µF
C1, C3, C4, C5, C6, C7, C8, C9 +8
1
3.3µF
C2
3
4.7µF
C10, C12, C16
3
1µF
C14, C15, C17
2
10µF
C20, C21
2
100nF
C22, C23
Show 8 more
QtyPartRefs
1
470µF
C28
9
10k
R1, R4, R5, R10, R11, R12, R15, R16 +1
1
2.2k
R2
1
12k
R3
4
1k
R6, R7, R8, R9
2
100
R13, R14
3
270
R17, R18, R19
1
4.7k
R20

Pet on a chip design files

The KiCad project lives in the ept221/pet-on-a-chip repository on GitHub; these links point at the commit this page was built from.

Pet on a chip: common questions

What microcontroller does the Pet on a chip use?

The Pet on a chip is built around the ICE40HX8K-BG121, from the FPGA family.

How big is the Pet on a chip PCB?

The Pet on a chip measures 76.2 × 63.5 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Pet on a chip?

67 components, from 28 distinct parts. The full bill of materials is listed on this page.

Where can I download the Pet on a chip design files?

From the ept221/pet-on-a-chip repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Pet on a chip design in my own project?

Yes, under the terms of its MIT license, which ept221 chose for the repository.

Can I test firmware for the Pet on a chip without the hardware?

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

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