HiFive Unleashed


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Overview... System-on-Chip...
  • SiFive Freedom U540
  • Primary processor type -- RISC-V (E51 + 4x U54 RV64GC)
  • Primary processor word-width -- 64-bit
  • Primary processor cores -- 5
  • Primary processor clock rate (GHz) -- 1.5
Additional processors (if any)...
  • GPU (graphics) --
  • MCU (microcontroller) --
  • FPGA (gates) --
  • Other (DSP, FPU, NPU, TPU, AI...) --
System RAM...
  • Maximum capacity (GB) -- 8
  • Type -- DDR4
  • ECC support -- Yes
  • Factory installed? -- Yes
On-board solid-state storage...
  • Maximum capacity (GB) -- 0.0
  • Type -- SPI
  • Factory installed? -- Yes
Removable solid-state storage...
  • Interface type -- microSD
  • m.2 interfaces -- 0
  • m.2 NVMe support --
SATA support...
  • SATA ports -- 0
USB ports...
  • USB hosts -- 0
  • USB host types --
  • USB OTG ports -- 0
Ethernet...
  • Ethernet interfaces -- 1
  • Maximum LAN speed (Mbps) -- 1000
  • Wake-on-LAN support? --
Wireless...
  • WiFi --
  • Bluetooth --
  • Broadband --
  • LoRa --
HDMI...
  • Number of HDMI ports -- 0
  • HDMI version --
  • Max. HDMI resolution --
  • FPS at max. resolution --
  • HDMI audio support? -- No
Other display interfaces...
  • Composite video (CVBS) ports -- 0
  • Other display interfaces (DSI, LVDS, VGA...) --
Camera interfaces...
  • Number of camera ports -- 0
  • Camera interface types --
Audio I/O...
  • Analog output ports -- 0
  • Audio connector type -- n/a
  • Audio via HDMI? -- No
  • SPDIF interfaces -- 0
  • Line inputs -- 0
  • Mic inputs -- 0
  • On-board microphones -- 0
Other I/O...
  • GPIO -- 40
  • ADC -- 0
  • PWM -- 0
  • SPI -- 1
  • I2C -- 1
  • UARTs -- 1
  • RS232 (or 485 or 422) -- 0
  • IR receiver -- No
Expansion connector compatibility?
  • Arduino compatible -- No
  • Raspberry Pi compatible -- No
Miscellaneous functions...
  • Real time clock (RTC) support --
  • PMIC/PMU (power management controllers) --
  • Lithium battery support --
Operating system support...
  • Linux -- yes
  • Android --
  • Windows --
  • Other OSes --
Other features not listed elsewhere:

32 MB quad SPI flash from ISSI
FMC connector for future expansion
4+1 Multi-Core Coherent Configuration, up to 1.5 GHz
4x U54 RV64GC Application Cores with Sv39 Virtual Memory Support
1x E51 RV64IMAC Management Core
Coherent 2 MB L2 Cache
64-bit DDR4 with ECC
1x Gigabit Ethernet
Built on TSMC 28 nm process

NOTE: as of 200528, there do not appear to be boards available for sale, per:
https://www.crowdsupply.com/sifive/hifive-unleashed

Physical specs...
  • Width (mm) -- 0
  • Height (mm) -- 0
  • Depth (mm) -- 0
  • Weight (gm) --
  • Input voltage, min. (V) -- 12
  • Input voltage, max. (V) -- 12
  • Input current, min. (A) -- 0
  • Input current, max. (A) -- 0
  • Operating temp., min. (°C) --
  • Operating temp., max. (°C) --
  • Certifications -- (none listed)
Further information...
[board ID = 237]

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