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A Queued Serial Peripheral Interface (QSPI; different to but has same abbreviation as Quad SPI described in § Quad SPI) is a type of SPI controller that uses a data queue to transfer data across an SPI bus. [19] It has a wrap-around mode allowing continuous transfers to and from the queue with only intermittent attention from the CPU.
The QPI is an element of a system architecture that Intel calls the QuickPath architecture that implements what Intel calls QuickPath technology. [12] In its simplest form on a single-processor motherboard, a single QPI is used to connect the processor to the IO Hub (e.g., to connect an Intel Core i7 to an X58). In more complex instances of the ...
ROM size of 64 KB, which contains a boot loader with optional booting from USART0 / USART3, USB0 / USB1, SPI Flash, Quad SPI Flash, external 8 / 16/ 32-bit NOR flash. The ROM also contains an API for in-system programming, in-application programming, OTP programming, USB device stack for HID / MSC / DFU.
Devices implementing SPI are typically specified with line rates of 700~800 Mbit/s and in some cases up to 1 Gbit/s. The latest version is SPI 4 Phase 2 also known as SPI 4.2 delivers bandwidth of up to 16 Gbit/s for a 16 bit interface. The Interlaken protocol, a close variant of SPI-5 replaced the System Packet Interface in the marketplace.
QuickPath Interconnect (QPI) by Intel (though this is an off-chip interface, not on-chip bus) virtual share from PICC - free and open source; TileLink - Free and open bus architecture from CHIPS Alliance [6]
The Intel Ultra Path Interconnect (UPI) [1] [2] is a scalable processor interconnect developed by Intel which replaced the Intel QuickPath Interconnect (QPI) in Xeon Skylake-SP platforms starting in 2017.
In contrast, Uncore functions include QPI controllers, L3 cache, snoop agent pipeline, on-die memory controller, on-die PCI Express Root Complex, and Thunderbolt controller. [3] Other bus controllers such as SPI and LPC are part of the chipset. [4] The Intel uncore design stems from its origin as the northbridge. The design of the Intel uncore ...
SCPI was defined as an additional layer on top of the IEEE 488.2-1987 specification "Standard Codes, Formats, Protocols, and Common Commands". [4] The standard specifies a common syntax, command structure, and data formats, to be used with all instruments.