Libre Computer Alta Compute Module (AML-A311D-CM)
The Alta Compute Module puts the A311D into the Raspberry Pi CM4 form factor and works on the CM4 and CM5 IO boards. On those boards the second HDMI port, PCM input and the CM5 IO Board’s fan tachometer don’t work. The module has no wireless. SDIO is routed out for an external Wi-Fi module. It runs Libre Computer’s Linux and U-Boot, and upstream support is pending.
Hardware
Specs
| SoC | Amlogic A311D |
|---|---|
| Process | 12 nm |
| CPU | 4× Cortex-A73 @ 2.2 GHz (big) 2× Cortex-A53 @ 1.8 GHz (LITTLE) |
| Memory | LPDDR4 / LPDDR4X |
| GPU | Mali-G52 MP4 @ 800 MHz Vendor: OpenGL ES 1.1/2.0/3.2, Vulkan 1.1, OpenCL 2.0 Mesa: OpenGL 3.1, OpenGL ES 3.1, Vulkan 1.3, OpenCL 3.0 (Panfrost, PanVK, Rusticl, Panfrost kernel) |
| NPU | Amlogic NPU, 5 TOPS (INT8) |
| VPU | Decode: 4K@60fps H.265, VP9, AVS2 Encode: 1080p@60fps H.264, H.265 |
| ISP | up to 8 MP |
| SoC page | Amlogic A311D |
Interfaces
| Board | Libre Computer Alta Compute Module (AML-A311D-CM) |
|---|---|
| Memory | LPDDR4 32-bit 2 / 4 GB |
| Camera | 4-lane MIPI CSI |
| Display | HDMI 2.0 (4K HDR) with ARC, MIPI DSI |
| Storage | eMMC and SD simultaneously, with card detect, SPI NOR/NAND interface |
| PCIe | 1× board-to-board connector: PCIe (muxed with USB 3) |
| USB | 1× USB 3.0 board-to-board connector (muxed with PCIe) |
| Ethernet | 1× 1 GbE |
| Wi-Fi | None, SDIO for external modules |
| Audio | ARC, Line-out stereo, PCM out/sync/clock |
| Form factor | Raspberry Pi CM4 form factor, 2× 100-pin high-density connectors |
| Power | Low-power states, PCIe power and wake control |
| Software support | Until 2055 |
Compare Libre Computer Alta Compute Module (AML-A311D-CM) with other boards and SoCs →