Spacetouch SPV60 AI audio processor features a 400 MHz Andes D25F RISC-V core

Spacetouch SPV60 is a RISC-V AI audio processor with an Andes D25F 32-bit RISC-V CPU IP core with P-extension (DSP/SIMD) that is also found in the Telink TLSR9 wireless audio microcontroller introduced in 2020.

But the SPV60 is clocked at a higher 400 MHz frequency, adopts a CPU + NPU + uDSP heterogeneous multi-core architecture with a 100 GOPS AI accelerator and a micro DSP capable of handling 1024-point FFT and iFFT among other mathematical functions, and offers a range of peripherals interfaces such as USB 2.0, SPDIF, I2C, PDM for microphone arrays, and more.

SpaceTouch SPV60
SPV60 block diagram – Source:

Spacetouch SPV60 specifications:

  • CPU
    • Andes D25F 32-bit RISC-V core with P extension (DSP/SIMD ISA) clocked at up to 400MHz
    • 5-stage pipeline
    • Hardware multiplication/division operations
    • Single precision floating point accelerator
    • 32KB I-Cache and 16KB D-Cache; 32KB L2 Cache
  • Spacetouch-designed uDSP – Support for 1024-point FFT and IFFT, FIR, COS, SIN, SQRT, Arctan, LOG, and other functions
  • Spacetouch-designed NPU – Over 100 GOPS (INT8) with support for CNN, RNN, and other networks
  • Memory – 512KB SRAM, support for up to 8MP PSRAM
  • Storage – Up to 16MB flash, SD card interface
  • Audio
    • ADC: DNR 105dB, THD+N -90dB
    • DAC: DNR 105dB, THD+N -90dB
    • 0V direct drive amplifier: 32 Ohms, 25mW
    • I2S and SPDIF interfaces
    • Support for up to 2x analog microphones, up to 4x digital microphones
  • USB – USB 2.0 device
  • Analog – 10-bit SAR ADC for key detection and voltage detection
  • I/Os
    • 8x GPIOs with functions such as I2C, PWM, external interrupts, SPI, UART, etc…
    • I/O voltage – 1.8V to 3.3V
  • Package – QFN40 for the SPV6040

There’s currently a single part listed on the product page: the SPV6040 with 512KB RAM, 1MB flash, and a QFN40 package. There’s limited information on the Spacetouch website, but we can glean a few more details in QQ as I did above, and in a press release by Andes Technology where we learn engineers can make use of development tools such as a RISC-V DSP/SIMD ISA compiler, a DSP library and emulator, and the AndeSoft NN Library for AI application computing.

Some audio features include AI noise reduction, AI echo cancellation, AI acoustic noise suppression, and speech recognition, and we’re also told the audio chip is optimized for low power consumption for battery-powered embedded systems and mobile devices. Spacetouch is also supposed to provide reference designs (but none of those are public).

The SPV60 series chips have already entered mass production and should find their way into smart headphones, professional audio, and other audio devices.

Thanks to TLS for the tip.

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4 months ago

no bluetooth? that seems odd for an audio processor like this.

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