ARM AMBA 4 Specification Maximizes
Performance and Power Efficiency
New AMBA specification and AXI protocols build on de facto standard to broaden market applicability
March 08, 2010 05:03 AM Eastern Time
CAMBRIDGE, U.K.--(EON: Enhanced Online News)--ARM [(LSE: ARM); (Nasdaq: ARMH)] today
announced availability of phase one of the new AMBA® 4 specification, providing increased functionality and
efficiency for complex, media-rich on-chip communication.
The AMBA specification is the de facto standard for system on-chip interconnects, and was introduced by ARM
more than 15 years ago. Like its predecessor AMBA 3, introduced in 2003, the AMBA 4 specification has been
designed by and for the industry with contributions from 35 of the industry’s leading OEM, semiconductor and EDA
Phase one of the AMBA 4 specification includes definition of an expanded family of AXI™ interconnect protocols
including AXI4, AXI4-Lite and AXI4-Stream. The AXI4 protocol adds support for longer bursts and Quality of
Service (QoS) signaling, and is a natural extension of the AMBA 3 specification. Long burst support aids integration
of devices with large block transfers, while QoS signaling provides the ability to manage latency and bandwidth in
complex multi-master systems.
The new AMBA 4 specification and the AXI4 protocols have also been extended to meet the needs of FPGA
implementations. AXI4-Lite is a subset of the full AXI4 specification for simple control register interfaces, reducing
SoC wiring congestion and simplifying implementation, while the AXI4-Stream protocol provides an efficient
streaming interface for non-address-based, point-to-point communication, such as video and audio data.
“These new specifications are a clear demonstration of the ongoing technical development and innovation in on-chip
communication by ARM, and also the ongoing extension of the AMBA specification into new areas such as the
FPGA community,” said Keith Clarke, VP & GM of Fabric IP Processor Division, ARM. “Stan