12 layers280 × 111.2 mm
Fpga candelabra
chipsalliance/rocket-pcb
PCB libraries and templates for rocket-chip based FPGA/ASIC designs
738 parts21Apache-2.0
4 layers25.4 × 15.2 mm
Pmod microsd
chipsalliance/rocket-pcb21PCB libraries and templates for rocket-chip based FPGA/ASIC designs
- Size
- 25.4 × 15.2 mm
- Copper layers
- 4
- Thickness
- 1.62 mm
- Parts
- 23
- Nets
- 15
- Pads
- 88
- Tracks, vias
- 197, 63
- Pours
- 143
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 31 Jan 2023
- Updated
- 28 Oct 2026
Overview
Pmod microsd is an open-source printed circuit board by chipsalliance, from the chipsalliance/rocket-pcb repository on GitHub, published under the Apache-2.0 licence. It is a 4-layer board of 25.4 × 15.2 mm with 23 parts on 15 nets, routed with 197 tracks and 63 vias.
It is built around the RCLAMP0524P, NCD1206O1 and NCD1206Y1, with the PZ254R-12-12P among its other parts. Its parts include 12 resistors, 4 capacitors, 3 ICs, 2 diodes and 2 connectors.
Main components
4RCLAMP0524P
DFN2510-10-55℃~+125℃ 0.35pF、0.8pF 17V 4.5A 5V 6.8V 80nA ESD Four channels IEC 61000-4-2 Unidirectional DFN2510-10 ESD and Surge Protection (TVS/ESD) ROHSTECH PUBLICESD And Surge Protection (TVS/ESD)
NCD1206O1
1206-30℃~+85℃ 1.6V~2.6V 130° 25mA 589nm~610nm 610nm 65mW 80mcd~220mcd Discrete Diode Orange Top-mount 1206 LED Indication - Discrete ROHSFoshan NationStar OptoelectronicsLED Indication - DiscreteNCD1206Y1
1206-30℃~+85℃ 1.6V~2.6V 130° 180mcd 25mA 586nm~593nm 595nm 65mW Discrete Diode Yellow 1206 LED Indication - Discrete ROHSFoshan NationStar OptoelectronicsLED Indication - Discrete
PZ254R-12-12P
弯插,P=2.54mm-40℃~+105℃ 12P 2 2.54mm 2.54mm 2.5mm 2x6P 6mm Black Brass Pin Header Right Angle 弯插,P=2.54mm Pin Headers ROHSXFCNPin Headers
README
pmod_microsd/README.mdPMOD_MICROSD
The Pmod MicroSD provides a microSD card slot to any board that has 3.3V logic and is pin compatible with a 12-pin Pmod port capable of SPI communication.
This board is specially designed to adapt to VCU118, and the pull-up resistor for SDIO is modified to 330 ohm.
3D view
Top view
Bottom view
Introduction
PMOD
This design complies with Digilent Pmod™ Interface Specification 1.2.0.
Note that the pin sequence numbers on the digilent PMOD specification are inconsistent with the PMOD pin sequence numbers of AMD VCU118 on the document. Essentially they are the same, but the numbering of AMD VCU118 uses a double-column staggered odd-even arrangement. Here is their mapping relationship.
| PMOD PIN | VCU118 PIN | SDIO FUNCTION | SPI FUNCTION |
|---|---|---|---|
| 1 | 1 | DAT3(D3) | #CS |
| 2 | 3 | CMD | MOSI |
| 3 | 5 | DAT0(D0) | MISO |
| 4 | 7 | CLK | SCLK(SCK) |
| 5 | 9 | GND | GND |
| 6 | 11 | 3P3V(VDD) | 3P3V(VDD) |
| 7 | 2 | DAT1(D1) | NC |
| 8 | 4 | DAT2(D2) | NC |
| 9 | 6 | #DET(#CD) | #DET(#CD) |
| 10 | 8 | #WP | #WP |
| 11 | 10 | GND | GND |
| 12 | 12 | 3P3V(VDD) | 3P3V(VDD) |
LED
There are two LEDs on the PCB, the yellow one is the card detection indicator and the orange one is the power indicator.
| LED | COLOR | FUNCTION | ON | OFF |
|---|---|---|---|---|
| 1 | Yellow | Card detection indicator | MicroSD Card inserted | No MicroSD card |
| 2 | Orange | Power indicator | Power on | Power off |
Special signal
Among them, the #WP signal is constant high level. If the WP signal is
low, please check the power supply and there may be a fault.
| NAME | HIGH | LOW |
|---|---|---|
| #DET(#CD) | No MicroSD card | MicroSD Card inserted |
| #WP | Write protect is off | This state is impossible |
Preparation
Install kicad 8, cmake, ninja.
Build
cmake -G Ninja -B build
cmake --build buildIf you only need to generate a pdf of the schematic or pcb,
cmake --build build --target pdfIf you need to generate complete production data,
cmake --build build --target productionParts
23| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 330 | Resistor_SMD:R_0402_1005Metric | R3, R4, R5, R6, R7 |
| 3 | 10k | Resistor_SMD:R_0402_1005Metric | R8, R9, R10 |
| 2 | 100n | Capacitor_SMD:C_0402_1005Metric | C3, C4 |
| 2 | 10u | Capacitor_SMD:C_0402_1005Metric | C1, C2 |
| 2 | 200 | Resistor_SMD:R_0402_1005Metric | R1, R2 |
| 2 | 6.8k | Resistor_SMD:R_0402_1005Metric | R11, R12 |
| 2 | RCLAMP0524P | CHIPSAlliance_Package_SON:USON-10_2.5x1.0mm_P0.5mm | U1, U2 |
| 1 | AIP74LVC1T45GB236TR | CHIPSAlliance_Package_TO_SOT_SMD:SOT-23-6 | U3 |
| 1 | Micro_SD_Card_Det2 | CHIPSAlliance_Connector:microSD_HC_Molex_104031-0811 | J2 |
| 1 | NCD1206O1 | LED_SMD:LED_1206_3216Metric | D2 |
| 1 | NCD1206Y1 | LED_SMD:LED_1206_3216Metric | D1 |
| 1 | PZ254R-12-12P | CHIPSAlliance_Connector:PinHeader_2x06_P2.54mm_Horizontal_PMOD | J1 |
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Questions
How big is the Pmod microsd PCB?
It measures 25.4 × 15.2 mm and has 4 copper layers, 1.62 mm thick.
What parts does the Pmod microsd use?
23 parts, built around the RCLAMP0524P, NCD1206O1, NCD1206Y1 and PZ254R-12-12P. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Pmod microsd KiCad files?
From the chipsalliance/rocket-pcb repository on GitHub, at the commit this page was made from: the board is pmod_microsd/pmod_microsd.kicad_pcb and its schematic fmc_basic_peripheral/fmc.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Pmod microsd design in my own project?
Its repository publishes it under the Apache-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).