The Arm Cortex-A7 processor is the most efficient Armv7-A processor
The Cortex-A7 processor provides up to 20% more single thread performance than the Cortex-A5. The processor incorporates all features of the high-performance Cortex-A15 and Cortex-A17 processors, including virtualization support in hardware, Large Physical Address Extensions (LPAE), Neon, and 128-bit AMBA 4 AXI bus interface.
|Multicore||1-4 cores. Symmetric Multiprocessing (SMP) within a single processor cluster, and multiple coherent SMP processor clusters through AMBA 4 technology
|Memory Management Unit (MMU)
||Armv7 Memory Management Unit
|Debug and Trace
Compare the specifications of Cortex-A Armv7-A and Armv8-A processors:
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The Cortex-A7 processor builds on the energy-efficient 8-stage pipeline of the Cortex-A5 processor. It also benefits from an integrated L2 cache designed for low-power, with lower transaction latencies and improved OS support for cache maintenance. On top of this there is improved branch prediction and an improved memory system performance, with 64-bit load-store path, 128-bit AMBA 4 AXI buses and increased TLB size (256 entry, up from 128 entry for Cortex-A9 and Cortex-A5), increasing performance for large workloads such as web browsing.
In a 28nm process, the Cortex-A7 can run at 1.2-1.6GHz, has an area of 0.45mm2 (with Floating-Point Unit, Neon and a 32KB L1 cache) and requires less than 100mW of total power in typical conditions. This lowest performance profile makes it an ideal standalone processor for a range of mobile devices, and means the Cortex-A7 can ultimately deliver similar performance to the Cortex-A9 processor at much higher levels of power efficiency.