RAM2E
About the RAM2E PCB
RAM2E is an open source FPGA PCB design by garrettsworkshop, published on GitHub under the Custom license license. It is a 4-layer board measuring 78.2 × 50 mm, with 75 components from 26 distinct parts.
Its main chip is the LCMXO2-640HC-4TG100C, from the FPGA family. Other key parts include the W9812G6KH-6, 74LVC245APW, 74AHCT245PW, XC6206P332MR and AP2127K-1.2TRG1. By type, the board carries 36 capacitors, 16 resistors, 11 ICs, 5 connectors, 1 crystal and 1 diode.
From the project
RAMWorks-compatible auxiliary RAM expansion card for Apple IIe
Main components on the RAM2E
RAM2E bill of materials (BOM)
75 components, 26 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LCMXO2-640HC-4TG100C | TQFP-100_14x14mm_P0.5mm | U1 |
| 1 | W9812G6KH-6 | TSOP-II-54_22.2x10.16mm_P0.8mm | U2 |
| 3 | 74LVC245APW | TSSOP-20_4.4x6.5mm_P0.65mm | U3, U4, U5 |
| 2 | 74AHCT245PW | TSSOP-20_4.4x6.5mm_P0.65mm | U6, U7 |
| 1 | XC6206P332MR | SOT-23 | U8 |
| 1 | AP2127K-1.2TRG1 | SOT-23-5 | U9 |
| 1 | CH340G | SOIC-16_3.9mm | U10 |
| 1 | 74AHCT1G125GW | SOT-353 | U11 |
| 1 | 12M | Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | AppleIIeAux | AppleIIeAux_Edge | J1 |
| 1 | microUSB | USB_Micro-B_Amphenol_10118192-0001 | J2 |
| 1 | C14M | EdgeClipHole | J3 |
| 1 | C14M | PinHeader_1x02_P2.54mm_Vertical | J4 |
| 1 | JTAG | Tag-Connect_TC2050-IDC-FP_2x05_P1.27mm_Vertical | J5 |
| 4 | ~ | PasteHole_1.152mm_NPTH | H1, H2, H3, H4 |
| 1 | ~ | PasteHole_1.1mm_PTH | H5 |
| 1 | Amber | LED_0805 | D1 |
| 7 | 10U 10u | C_0805 | C1, C2, C3, C4, C5, C6, C29 |
| 26 | 2U2 2u2 | C_0603 | C7, C8, C9, C10, C11, C12, C13, C14 +18 |
| 3 | 22P 22p | C_0603 | C31, C32, C33 |
Show 6 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 0 | R_0805 | R1 |
| 5 | 47 | R_0603 | R2, R3, R12, R13, R22 |
| 5 | DNP | R_0603 | R4, R5, R7, R8, R9 |
| 3 | 2K2 2k2 | R_0603 | R6, R14, R15 |
| 1 | 220 | R_0805 | R10 |
| 1 | 10K 10k | R_0603 | R11 |
RAM2E design files
The KiCad project lives in the garrettsworkshop/RAM2E repository on GitHub; these links point at the commit this page was built from.
RAM2E: common questions
What microcontroller does the RAM2E use?
The RAM2E is built around the LCMXO2-640HC-4TG100C, from the FPGA family.
How big is the RAM2E PCB?
The RAM2E measures 78.2 × 50 mm, has 4 copper layers and is 1.6108 mm thick.
How many components are on the RAM2E?
75 components, from 26 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 RAM2E design files?
From the garrettsworkshop/RAM2E repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the RAM2E design in my own project?
It is published under Custom license, which limits how it may be reused; read the license before building on it.
Can I test firmware for the RAM2E 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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