HardLabs

Sip board

hprd·z80-fpga-drop-in-replacement·hardware/sip-board/sip-board.kicad_pcb

Sip board layout, top view — open source FPGA board by hprd

About the Sip board

Sip board is an open source FPGA PCB design by hprd, published on GitHub. It is a 10-layer board measuring 17 × 50 mm, with 95 components from 33 distinct parts.

Its main chip is the XC7S15-1CPGA196C, from the FPGA family. Other key parts include the MT25QL512ABB1EW9-0SIT and LTC3569EUDC#TRPBF. By type, the board carries 39 capacitors, 32 resistors, 3 ICs, 3 transistors, 3 inductors and 1 connector.

It belongs with the retro computing designs in this gallery.

From the project

UT Austin Fall 2025-Spring 2026 Senior Design Project for developing a Zilog Z80 CPU drop-in replacement using an FPGA.

Relevant links and information from previous group's iteration: - Instruction Set - Z80 User Manual - Master Reference Website - Timing Quirks

Main components on the Sip board

MT25QL512ABB1EW9-0SITXC7S15-1CPGA196CLTC3569EUDC#TRPBF

Sip board bill of materials (BOM)

95 components, 33 distinct parts.

QtyPartRefs
1
MT25QL512ABB1EW9-0SIT
IC1
1
XC7S15-1CPGA196C
IC2
1
LTC3569EUDC#TRPBF
IC3
2
MBT3904DW1
Q1, Q2
1
BS170F
Q5
1
Conn_02x03_Odd_Even
J1
1
SW_DIP_x03
CFG1
10
NXB0104GU12X
~
LVL1, LVL2, LVL3, LVL4, LVL5, LVL6, LVL7, LVL8 +2
1
EVQ-P2R02W
S1
1
LED
DONE1
1
LED
D3
1
BRC2012T3R3MD
3u3
L1
1
SRN2012-1R5M
1u5
L2
1
SRN2012-2R2M
2u2
L3
2
22u
C1, C3
3
20p
C2, C4, C6
2
10u
C5, C39
16
0.47u
C7, C9, C12, C14, C16, C17, C18, C19 +8
1
47u
C8
9
4.7u
C10, C13, C15, C31, C32, C33, C34, C35 +1
Show 13 more
QtyPartRefs
4
100u
C11, C28, C29, C30
2
10u
C37, C38
14
100k
R1, R2, R3, R11, R12, R13, R14, R15 +6
5
4k7
R4, R5, R6, R10, R21
4
1k
R7, R8, R9, R25
1
3.48k, 1%
R23
1
10k, 1%
R24
1
30k
R28
2
120k, 1%
R29, R31
1
150k
R30
1
180k
R32
1
57.6k, 1%
R33
1
100
R36

Sip board design files

The KiCad project lives in the hprd/z80-fpga-drop-in-replacement repository on GitHub; these links point at the commit this page was built from.

Sip board: common questions

What microcontroller does the Sip board use?

The Sip board is built around the XC7S15-1CPGA196C, from the FPGA family.

How big is the Sip board?

The Sip board measures 17 × 50 mm, has 10 copper layers and is 1.616 mm thick.

How many components are on the Sip board?

95 components, from 33 distinct parts. The full bill of materials is listed on this page.

Where can I download the Sip board design files?

From the hprd/z80-fpga-drop-in-replacement repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Sip board design in my own project?

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

Can I test firmware for the Sip board 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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