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The Advanced eXtensible Interface (AXI) is an on-chip communication bus protocol and is part of the Advanced Microcontroller Bus Architecture specification (AMBA). [1] [2] AXI had been introduced in 2003 with the AMBA3 specification.
AXI, the third generation of AMBA interface defined in the AMBA 3 specification, is targeted at high performance, high clock frequency system designs and includes features that make it suitable for high speed sub-micrometer interconnect: separate address/control and data phases; support for unaligned data transfers using byte strobes
Wishbone adapts well to common topologies such as point-to-point, many-to-many (i.e. the classic bus system), hierarchical, or even switched fabrics such as crossbar switches. In the more exotic topologies, Wishbone requires a bus controller or arbiter, but devices still maintain the same interface.
A crossbar switch is an assembly of individual switches between a set of inputs and a set of outputs. The switches are arranged in a matrix. If the crossbar switch has M inputs and N outputs, then a crossbar has a matrix with M × N cross-points or places where connections can be made. At each crosspoint is a switch; when closed, it connects ...
In crossbar switch, there is a dedicated path from one processor to other processors. Thus, if there are n inputs and m outputs, we will need n*m switches to realize a crossbar. As number of outputs increase, number of switches increases by factor of n. For large network this will be a problem. Crossbar network
MicroBlaze's primary I/O bus, the AXI interconnect, is a system-memory mapped transaction bus with master–slave capability. Older versions of the MicroBlaze used the CoreConnect PLB bus. The majority of vendor-supplied and third-party IP interface to AXI directly (or through an AXI interconnect).
An interconnect processing unit (IPU) [13] is an on-chip communication network with hardware and software components which jointly implement key functions of different system-on-chip programming models through a set of communication and synchronization primitives and provide low-level platform services to enable advanced features [which?] in ...
The Open Core Protocol (OCP) is one of several FPGA processor interconnects used to connect soft FPGA peripherals to FPGA CPUs—both soft microprocessor and hard-macro processor. Other such interconnects include Advanced eXtensible Interface (AXI), Avalon , [ 1 ] and the Wishbone bus .