Usbscsi

cm68·usbscsi·hardware/usbscsi.kicad_sch

This repository ships a schematic but no board layout.

About the Usbscsi PCB

Usbscsi is an open source RP2040/RP2350 PCB design by cm68, published on GitHub. It is a board, with 25 components from 21 distinct parts.

Its main chip is the Raspberry Pi Pico 2 W, from the RP2040/RP2350 family. Other key parts include the Am53C94 SCSI controller, EZ-USB FX2 (CY7C68013A), 74LVC245A, 74LVC244A and 24LC64. By type, the board carries 7 ICs, 5 capacitors, 4 resistors, 2 transistors, 2 connectors and 1 crystal.

It belongs with the iot & wireless designs in this gallery.

From the project

A USB 2.0 High-Speed device that presents a real single-ended synchronous SCSI device (hard drive, CD-ROM, MO, tape, ZIP, …) to Linux as a standard USB mass-storage block device (/dev/sdX). Built around an Am53C94 SCSI controller (initiator) and a Cypress EZ-USB FX2 USB 2.0 High-Speed device controller, orchestrated by a Raspberry Pi Pico 2 W (RP2350 + WiFi) — with through-hole construction throughout.

Main components on the Usbscsi

Raspberry Pi Pico 2 W Am53C94 SCSI controller EZ-USB FX2 (CY7C68013A)74LVC245A 74LVC244A 24LC64 20 MHz oscillator

Usbscsi bill of materials (BOM)

25 components, 21 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	Raspberry Pi Pico 2 W	RaspberryPi_Pico_W_SMD_HandSolder	U1
1	Am53C94 SCSI controller	PLCC-84_THT-Socket	U2
1	EZ-USB FX2 (CY7C68013A)	SSOP-56_7.5x18.5mm_P0.635mm	U3
1	74LVC245A	DIP-20_W7.62mm	U4
1	74LVC244A	DIP-20_W7.62mm	U5
1	24LC64	DIP-8_W7.62mm	U6
1	20 MHz oscillator	Oscillator_DIP-8	U7
1	2N3904	TO-92_Inline	Q1
1	IRF9540N	TO-220-3_Vertical	Q2
1	24 MHz	Crystal_HC49-4H_Vertical	Y1
1	SCSI 50-pin	IDC-Header_2x25_P2.54mm_Vertical	J1
1	+5V in	TerminalBlock_bornier-2_P5.08mm	J2
1	Polyfuse	Fuse_Bourns_MF-RHT050	F1
2	PWR_FLAG		FLG1, FLG2
1	1N5817	D_DO-41_SOD81_P10.16mm_Horizontal	D1
2	22p	C_Disc_D5.0mm_W2.5mm_P2.50mm	C1, C2
1	100n	C_Disc_D5.0mm_W2.5mm_P2.50mm	C3
1	10u	C_Disc_D5.0mm_W2.5mm_P2.50mm	C4
1	1u	C_Disc_D5.0mm_W2.5mm_P2.50mm	C5
2	10k	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R1, R5

Show 1 more

Qty	Part	Footprint	Refs
2	2.2k	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R3, R4

Usbscsi design files

The KiCad project lives in the cm68/usbscsi repository on GitHub; these links point at the commit this page was built from.

Usbscsi: common questions

What microcontroller does the Usbscsi use?

The Usbscsi is built around the Raspberry Pi Pico 2 W, from the RP2040/RP2350 family.

How many components are on the Usbscsi?

25 components, from 21 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Usbscsi design files?

From the cm68/usbscsi repository on GitHub, which has the schematic, a netlist and the BOM; the links under Design files point to each one.

Can I use the Usbscsi design in my own project?

The repository has no license, so all rights stay with cm68. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Usbscsi without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.