Intel E3845 FH8065301487715 Hoja De Datos
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FH8065301487715
Low Power Engine (LPE) for Audio (I
2
S)
Intel
®
Atom™ Processor E3800 Product Family
2800
Datasheet
•
External timer function with an always running clock.
The LPE core runs at a peak clock frequency of 343 MHz and has dedicated on-chip
program and data memories and caches. The LPE core can access shared SRAM blocks,
and external DRAM through OCP fabric. It communicates with audio peripherals using
the audio sub-fabric, and employs Inter-Processor Communication (IPC) mechanism to
communicate with the SoC Processor Core.
program and data memories and caches. The LPE core can access shared SRAM blocks,
and external DRAM through OCP fabric. It communicates with audio peripherals using
the audio sub-fabric, and employs Inter-Processor Communication (IPC) mechanism to
communicate with the SoC Processor Core.
The Audio subsystem includes two OCP-based DMA engines. These DMA engines
support single and multi-block transfers. They can be configured to transfer data
between DRAM and audio CCMs or transfer data between CCMs and the audio
peripheral interfaces
support single and multi-block transfers. They can be configured to transfer data
between DRAM and audio CCMs or transfer data between CCMs and the audio
peripheral interfaces
All these interfaces are peripherals in the Audio subsystem. LPE, LPE DMA, or the SoC
processor core may access the peripherals during normal operation. The PMC may
access all peripherals during specific tasks such as at boot time or during power state
changes.A complete audio solution based on an internal audio processing engine which
includes several I
processor core may access the peripherals during normal operation. The PMC may
access all peripherals during specific tasks such as at boot time or during power state
changes.A complete audio solution based on an internal audio processing engine which
includes several I
2
S-based output ports.
The audio core used is a dedicated audio DSP core designed specifically for audio
processing (decoding, post-processing, mixing, etc.)
processing (decoding, post-processing, mixing, etc.)
Note:
LPE requires systems with more than 512MB memory. This is required since the LPE
firmware must reside at a stolen memory location on 512MB boundaries below 3 GiB.
The LPE firmware itself is ~1MB, and is reserved by BIOS for LPE use.
firmware must reside at a stolen memory location on 512MB boundaries below 3 GiB.
The LPE firmware itself is ~1MB, and is reserved by BIOS for LPE use.
21.3
Detailed Block Level Description
21.3.1
LPE Core
The LPE core in the SoC runs at maximum frequency of 343 MHz and interfaces with
the rest of the SoC system through the OCP bus. It is one of the masters on the Audio
Sub-Fabric The SoC Processor Core and LPE DMA engines are the other masters on the
fabric. The following figure shows the LPE core and its interfaces.
the rest of the SoC system through the OCP bus. It is one of the masters on the Audio
Sub-Fabric The SoC Processor Core and LPE DMA engines are the other masters on the
fabric. The following figure shows the LPE core and its interfaces.