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Dual-Core processors for mobile

The Cortex-R5 is the next generation in mobile phones (LTE) are deployed. They are smaller than a pinhead, have two nuclei and are in mobile phones of the future LTE generation do service, drive hard drives and SSDs, or to carry safety-critical tasks in the car: ARM's new Cortex-R5 MPCore content with little power while its big brother clocked Cortex-R7 MPCore with up to 1 GHz.

addition to the second computing core - omit the Licensee may also - and the associated coherence and SMP functions are a number of new additions to board: For example, the R5, the ARM, for example, for LTE phones recommends flexible in dealing with errors in real-time applications and provides a peripheral connection with a particularly low latency (LLPP). About the Coherency Accelerator port (ACP), the system-on-chip developers connect extensions that communicate coherently with the caches.

The Cortex-R7 draws its performance among other things, an improved branch prediction and revised Gleitkommarecheneinheiten. ARM says because of the superscalar design and out-of-order execution of even a "New Technology".

The ARM Cortex-R7 speaks of a new technology and changed the calculator a lot. understand Nevertheless Cortex-R5 and R7 the binary code of older ARM processors, particularly the predecessor of the Cortex-R4. Exact performance data or identify the power it - in the absence of finished chips - not yet, but some projections: a 65-nm-made structures and is optimized for performance at 620 MHz clock frequency R5 mWatt around 80.6 (0 , 13 mW / MHz) and need to reach around 1030 DMIPS. In standby are then mWatt 4.4. This value can be explained by different optimization requirements lowered to 0.02 mW, but only 270 MHz and 450 DMIPS in there. Interestingly, these drives "Power Optimization", the power consumption under load is slightly (0.18 mW) up. The chip area per square on the type of optimization between 0.4 and 0.8 mm.

The R7 will draw from a 1 GHz clock speed and 4600 DMIPS show 1.7 mm ², if it is made with 28-nm structures. The power could then be mWatt around 418th

interesting about this notion of CPU-ARM are also some undertones: so CPU forging proudly announces that four major customers (almost) have ready-made designs with the new chips. There is also for the Cortex-R7 already start with a question and Physical IP (Artisan library) - that is, an already for a 28-nm manufacturing process optimized version. In the past, ARM, however, this adjustment left to the customer or they only offered later. This was however sometimes seen as a drawback to smaller and smaller production structures and in competition with the Intel Corporation. Intel is due to our own production facilities early advantage of new process technologies and provides the Tic-Toc-model almost every year a new CPU generation ago. Intel's x86 cores have in terms of power still some residue on the Cortex-chips, but again only to find every few years, a model change. So had the Cortex-R4 his debut in 2006.

start via heise.de

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(c) by Joerg Hochwald