ARM

• Cavium ThunderX, ThunderX2 (Broadcom Vulcan), and Marvell ThunderX3
• Rockchip RK3399
• Ampere
  • Altra 80 ARMv8.2 cores up to 3.3GHz
  • Altra Max 128 ARMv8.2 cores up to 3.0GHz

Devices

• Korean KSLAB V-Raptor is a 32 node 2U rack server with each node consisting of a 24 ARM A53 Cortex processor and SDRAM DIMM slot

RISC-V

• Microsemi PolarFire
• Western Digital SweRV

POWER9

• Raptor Computing Systems developed the Talos II, which includes a 14nm 4-core POWER9 processor

Other

• Bitmain Sophon BM1880 includes two ARM cortex A53 cores, a RISC-V core and a TPU
• Intel acquired Movidius, an Irish start-up, that developed a low power computer vision chip. The series includes the Myriad 2, Myriad X and Keem Bay.

Development boards

• 96Boards
• Toradex
• SECO
• ADLINK is based in San Jose, but has a office in Mannheim

Bus contention

Bus contention occurs when more than one device tries to place values on a single shared channel at the same time. This is addressed with network on chip (NoC) designs.

Contention on a bus requires arbitration, which may dramatically increase the number of cycles required for an operation.

A bus arbiter arbitrates requests from multiple masters to determine which block may read or write. It can support multi-threading through atomic compare-and-swap operations.