3. TECHNICAL BRIEF
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3.8 Subsystem (MSM8255)
3.8.1 Modem
The modem subsystem consists of blocks directly or indirectly controlled by the modem ARM processor (ARM11).
Specifically, all blocks that directly provide the modem functionality (for example, modulation/demodulation,
searching, GPS, GSM modulation/demodulation), and all blocks that support the primary modem (such as the
MDSP, modem AHB bus, sleep control, and interrupt control blocks). The MSS is comprised of modem core
(support for UMTS, CDMA 1x/DO, GSM, and GPS), ARM11 subsystem, interrupt controller, and Qfuse macros.
3.8.2 CGR (codec, graphics, rotator).
The CGR subsystem has the cores that support many of the MSM8x55 device’s multimedia functions. It is a
collection of the following IPs:
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MFCV-720 p (video decode/encode)
Z460 3
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-D graphics - for advance UI and gaming
Z180 2
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-D graphics - for 2D rendering and vector graphics
Rotator
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- HW accelerator for camera, Z460, and MFCV-720 p
VPE (video preprocessing)
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- added image processing to supplement MFCV-720 p image features
3.8.3 Scorpion uni-processor
The application processor for the MSM8x55 device is the Scorpion processor (SC45U10) which is integrated in
the Scorpion uni-processor subsystem. The subsystem supports functions such as CSR support (AHB access is
design dependent), timers, primary interrupt controller, adaptive voltage scaling, clock and reset control, and
power management (SUPSS and SMPSS).