The Allwinner H135 is a 64-bit RISC-V multimedia SoC officially designed for low-cost projectors. However, support for HDMI Rx and MJPEG 1080p60 video encoding also makes it suitable for entry-level KVM (Keyboard, Video, and Mouse) solutions.
The H135 is based on the XuanTie C906 core, supports up to 256MB DDR2/DDR3/DDR3L, integrates a 1080p60 H.265/H.264 video decoder, MIPI DSI, dual-channel LVDS, and RGB888 display interfaces, and plenty of peripherals such as USB, SDIO, UART, SPI, PWM, GPIO, and more.
Allwinner H135 specifications:
- CPU – XuanTie C906 RISC-V CPU with 64 KB I-cache + 64 KB D-cache
- Display Engine
- Allwinner Awonder1.1 Lite post processing
- Keystone correction in online mode and [-360°,360°] rotation in offline mode
- De-interlace (DI) up to 1920×1080 @ 60fps
- G2D hardware accelerator with rotate and mixer functions
- VPU
- Video decoding – H.265, H.264, H.263, MPEG-1/2/4, and VC-1 up to 1080p60
- Image decoding – JPEG up to 1080p60
- Video encoding – JPEG/MJPEG up to 1080p60
- Memory – Up to 256MB 16-bit DDR2/DDR3/DDR3L
- Storage – SD3.0, eMMC 4.41, SPI Nor Flash
- Video Output
- RGB888 output up to 1920 x 1080 @ 60fps
- Dual-channel LVDS up to 1920 x 1080 @ 60fps
- 4-lane MIPI DSI up to 1920 x 1200 @ 60fps (reduced blanking)
- Video Input – HDMI Rx up to 35840 x 2160 @ 30 fps with support for HDCP 1.4 and CEC
- Audio
- 2x DACs
- Analog audio interfaces – HPOUTL/R
- Digital audio interfaces – DMIC, OWA IN/OUT
- USB
- USB 2.0 DRD
- USB 2.0 Host
- Low-speed I/Os
- 2x SPI, 6x UART, 4x TWI (I2C)
- 8-channel PWM
- IR Tx & Rx
- LEDC
- SDIO3.0
- Analog – GPADC, GPIO_ADC (pad can be used by GPIO)
- Security
- AES, DES, 3DES encryption and decryption algorithms
- RSA signature verification algorithm
- MD5/SHA and HMAC tamper-proofing
- Hardware random number generator
- Integrated 2 Kbits eFuse storage space
- Package – QFP128, 14 x 14 mm
The Allwinner H135 is not listed on the company’s website, and I found the information and diagrams above and below in the product brief shared on Whycan, and further details can also be found in the datasheet.
I could not find any information about OS support. Previous Allwinner projector SoCs like the H700 would run Android, but with 256MB RAM, the H135 will likely support Linux, or an RTOS, or HarmonyOS/openHarmony, or a combination of the three.
As mentioned in the introduction, some people have started working on Allwinner H135 boards. First, GLGH_ has designed the Avaota KVM board.
Like other Avaota boards, it will be open-source hardware. The board will enable a RISC-V KVM solution with 4Kp30/1080p30 HDMI capture, an Ethernet connector (it has to be USB Ethernet), a USB OTG port, an 800×480 MIPI DSI LCD, 1920×1080 @ 60 FPS MJPEG video streaming, and two UART connectors.
The second board is an Allwinner H135 system-on-module by DongShanPi marked “DshonLite-RV/A_V2.1”.
It’s soldered on the company’s 100ASK_T113-PRO Base board, and such as should be at least partially pin-to-pin compatible with the T113-S3 Core Lite module, which lacks HDMI input and is instead designed for automotive and industrial applications. I can only assume the RISC-V module was just soldered on that base board for internal testing.
That means we should get some inexpensive Full HD projectors and KVM solutions based on Allwinner H135 later this year. The KVM boards will compete against products like the $30 Sipeed NanoKVM based on the SOPHGO SG2002 RISC-V SoC, although the Avaota KVM offers some extra features with its (optional?) 800×480 display.
Jean-Luc started CNX Software in 2010 as a part-time endeavor, before quitting his job as a software engineering manager, and starting to write daily news, and reviews full time later in 2011.
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