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RAMROM CPLD board

roberto314·Unicomp2·not produced boards/RAMROM_CPLD_board/RAMROM_CPLD_board.kicad_pcb

RAMROM CPLD board layout, top view — open source STM32 board by roberto314

About the RAMROM CPLD board

RAMROM CPLD board is an open source STM32 PCB design by roberto314, published on GitHub. It is a 2-layer board measuring 100 × 100 mm, with 42 components from 24 distinct parts.

Its main chip is the STM32F411, from the STM32 family. Other key parts include the 74AC138, XC95144XL-TQ144, 74HCT245, 74LVC4245 and IS61C5128AL-10TLI. By type, the board carries 17 connectors, 11 capacitors, 8 ICs, 2 jumpers, 2 resistors and 1 battery holder.

It belongs with the retro computing designs in this gallery.

From the project

A modular 8-bit Computer able to recreate (nearly) every Retro computer of the late 70s to mid 80s.

A modular 8-bit Computer able to recreate (nearly) every microcomputer of the mid 70s to early 80s in Hardware without FPGAs (although an FPGA can be added). Can also be used as a teaching tool for:

VHDL or Verilog C RTOS (STM32F401 runs ChibiOS Link: https://www.chibios.org) Python bash and linux in general (Olimex board runs linux with fbterm and tmux) Harwaredesign Timing of CPUs maybe Assembler SPI and I2C Interfaces CPLDs and FPGAs

RAMROM CPLD board, from the project README
From the project README

Main components on the RAMROM CPLD board

74AC138XC95144XL-TQ14474HCT24574LVC4245IS61C5128AL-10TLIMXD1210

RAMROM CPLD board bill of materials (BOM)

42 components, 24 distinct parts.

QtyPartRefs
2
74AC138
U1, U3
1
XC95144XL-TQ144
U2
1
74HCT245
U4
1
74LVC4245
U5
2
IS61C5128AL-10TLI
U6, U7
1
MXD1210
U9
2
BUS
J1, J3
2
Conn_01x07
J2, J5
2
Conn_02x07_Counter_Clockwise
J4, J9
1
Conn_01x13
J7
1
Conn_01x03
J8
1
CS_Breakout
J10
1
BO2
J11
4
Conn_01x38_Male
J18, J108, J109, J110
1
STM32F411
J26
2
Conn_01x32
J106, J107
1
Battery_Cell
BT1
1
Jumper_3_Bridged12
JP1
1
ThresVolt
JP2
1
1N4148
D1
Show 4 more
QtyPartRefs
10
100n
C1, C2, C4, C5, C6, C7, C8, C10 +2
1
100n
C3
1
10k
R1
1
R_NET_8_SMD
RN1

RAMROM CPLD board design files

The KiCad project lives in the roberto314/Unicomp2 repository on GitHub; these links point at the commit this page was built from.

RAMROM CPLD board: common questions

What microcontroller does the RAMROM CPLD board use?

The RAMROM CPLD board is built around the STM32F411, from the STM32 family.

How big is the RAMROM CPLD board?

The RAMROM CPLD board measures 100 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the RAMROM CPLD board?

42 components, from 24 distinct parts. The full bill of materials is listed on this page.

Where can I download the RAMROM CPLD board design files?

From the roberto314/Unicomp2 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the RAMROM CPLD board design in my own project?

The repository has no license, so all rights stay with roberto314. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the RAMROM CPLD board without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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