August 12, 2022

Robotic Notes

All technology News

Bringing Armv9 To Premium Smartphones

5 min read


Alongside the new Snapdragon 8+ Gen 1, as part of Qualcomm’s “Snapdragon Night” event in China this evening, the company is also rolling out a brand-new SoC for the premium phone market, the Snapdragon 7 Gen 1. Aimed downmarket of Qualcomm’s traditional flagship SoCs, the Snapdragon 7 Gen 1 is the first non-flagship SoC to be introduced by Qualcomm since they implemented their new platform naming and differentiation scheme. But, like the Snapdragon 7xx series before it, the latest Snapdragon 7 SoC follows the same design mantra of offering flagship-level features with more modest performance and costs.

Within Qualcomm’s pantheon of smartphone SoCs, the Snapdragon 7 Gen 1 is the successor to last year’s Snapdragon 780G / 778G parts. For the moment, Qualcomm is sticking with a single SKU, although last year the 780G and 778G were a few months apart – so Qualcomm may bifurcate things farther down the line.

Like its predecessors, the 7 Gen 1 follows Qualcomm’s cascading development strategy, which sees new features first pioneered in their flagship SoC successfully implemented in future, lower-tier chips. The big update on the Snapdragon 8 Gen 1 was of course the switch to the Armv9 architecture and Arm’s associated CPU cores, and now Arm’s premium tier SoC is getting the same treatment.













Qualcomm Snapdragon 8 Gen 1 Flagship SoCs
SoC Snapdragon 7 Gen 1 Snapdragon 780G
CPU 1x Cortex-A710
@ 2.4GHz

3x Cortex-A710
@ 2.36GHz

4x Cortex-A510
@ 1.8GHz

1x Cortex-A78
@ 2.4GHz

3x Cortex-A78
@ 2.2GHz

4x Cortex-A55
@ 1.9GHz

GPU Adreno Adreno 642
DSP / NPU Hexagon Hexagon 770
Memory
Controller
2x 16-bit CH

@ 3200MHz LPDDR5 / 25.6GB / s

2x 16-bit CH

@ 2133MHz LPDDR4X / 17.0GB / s

ISP / Camera Triple 14-bit Spectra ISP

1x 200MP or 84MP with ZSL

or
64 + 20MP with ZSL

or
3x 25MP with ZSL

4K HDR video & 64MP burst capture

Triple 14-bit Spectra 570 ISP

1x 192MP or 84MP with ZSL

or
64 + 20MP with ZSL

or
3x 25MP with ZSL

Encode /
Decode
4K30 10-bit H.265

Dolby Vision, HDR10 +, HDR10, HLG

720p480 infinite recording

4K30, 1080p120
H.264 & H.265

10-bit HDR pipelines

Integrated Modem X62 Integrated

(5G NR Sub-6 + mmWave)

DL = 4400 Mbps

X53 Integrated

(5G NR Sub-6 4×4 100MHz)
DL = 3300 Mbps

Mfc. Process Samsung 4nm Samsung 5LPE

In terms of organization, the new 7 Gen 1 is very similar to the 780G, implementing a 1 + 3 + 4 core configuration. Qualcomm is only using two core types here – the high-performance Cortex-A710 and high-efficiency Cortex-A510 – so rather than the prime core being a unique core type (ala the Cortex-X2 on the 8G1), it’s another Cortex- A710 here. Qualcomm is clocking this core at 2.4GHz, meanwhile the remaining 3 A710s are clocked a bit lower at 2.36GHz. Finally, the A510s come clocked at 1.8GHz, the same as on the 8G1.

The shift in CPU cores also brings an update to Qualcomm’s memory controller. The 7 Gen 1 adds LPDDR5 capabilities, supporting up to the same LPDDR5-6400 data rates as the 8 Gen 1. So with a 2×16-bit channel memory bus, the 7 Gen 1 can access up to 25.6GB / second of memory bandwidth, a 50% improvement over the LPDDR4X-capable 780G.

Unusual even for Qualcomm, the company isn’t talking about CPU performance with the new part. So absent benchmarking data, there’s little we can say here about performance expectations. The new Arm cores should allow for better performance, but there’s a lot of wiggle-room due to implementation details.

Meanwhile Qualcomm is being a bit more talkative on the GPU front, though not immensely so. Like the 8G1, Qualcomm is dropping any kind of model number for the GPU on the 7 Gen 1, so it’s simply “Adreno” with nothing to differentiate it from the 8G1 or previous-generation parts. Technically, we can’t even infer whether it uses Qualcomm’s new GPU architecture – though given the feature set and cascading design strategy, it’s almost certainly yes. But what Qualcomm is saying about the GPU performance of the new part is that it’s 20% faster than the Snapdragon 778G and it’s Adreno 642L GPU. By going with the weaker SKU, this is cherry picking by Qualcomm, but for now it at least confirms that the 7 Gen 1 will be somewhat faster than its predecessor.

Which is a good thing, too, since gaming is one of the major focuses of the 7 Gen 1. It’s gaming / GPU performance that Qualcomm leads with in their 7 Gen 1 marketing materials, and it’s no coincidence that this part is being announced at an event in China. Mobile gaming is big across the globe, but nowhere it is bigger than the Chinese market. So Qualcomm is undoubtedly expecting their OEM partners to shift a significant number of gaming-focused handsets in that busy market.

Meanwhile, since this isn’t a flagship part like the new 8+ Gen 1, Qualcomm isn’t being aggressive on the fab front, either. The 7 Gen 1 is being produced on Samsung’s 4nm process, the same one as the original 8 Gen 1, and which Qualcomm is intentionally supplanting with TSMC for their flagship SoC. And while Samsung’s process is clearly the lower performing option at this juncture, with lines at TSMC running out the door and around the block, it’s not surprising to see Qualcomm opt for what is a less constrained (and undoubtedly cheaper) fab for their second- tier smartphone SoC.

CPU and GPU matters aside, Qualcomm’s cascading design strategy also means a few other notable features from the 8G1 are moving down to their new 7-series SoC. That includes the newest Spectra ISP, as well as Qualcomm’s latest AI hardware and their trust management engine.

In the case of the 7 Gen 1’s Spectra ISP, it has been scaled down accordingly from the 8G1. Qualcomm is still implementing a “triple” ISP here that can handle up to 3 simultaneous cameras, however total throughput is lower. Still, the ISP can handle up to a 200MP image now, though that drops significantly to 64MP if you need zero shutter lag. Past that, this is another 14-bit imaging pipeline ISP, which is on-par with the 780G, but lacks the additional dynamic range of the 8G1.

Rounding out the package is an integrated modem, in the form of Qualcomm’s Snapdragon X62. Compared to last year’s 780G SoC and its X53 modem, the X62-equipped 7 Gen 1 offers both greater throughput and more bands. In particular, this SoC is mmWave capable, which was a notable omission from last year’s SoC. Altogether, the 7G1 / X62 is capable of reaching download speeds up to 4.4Gbps, a 33% improvement over its predecessor.

Wrapping things up, the Snapdragon 7 Gen 1 will be the quicker to ship of Qualcomm’s two new SoCs today. According to the company, handsets using the SoC will be available this quarter, with Honor, OPPO, and Xiaomi among the OEMs slated to release phones based around the new chip.



Source link