I.MX27L Просмотр технического описания (PDF) - Freescale Semiconductor

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I.MX27L

Multimedia Applications Processor

Freescale Semiconductor 

Functional Description and Application Information

Each module has individual control and configuration registers that are accessed via the IP interface, and

are capable of bus mastering the AMBA bus to independently access system memory without any CPU

intervention. This enables each module to be used independently of each other, and enables the

pre-processor and post-processor modules to provide acceleration features for other software codec

implementations and image processing software. These blocks work together to provide video

acceleration, and to off-load the CPU from computation intensive tasks. The PrP and PP can be used for

generic video pre- and post-processing, such as scaling, resizing, and color space conversions. A

32-bit-to-64-bit AHB gasket is used to convert a PrP AHB bus from a 32-bit to 64-bit protocol. A bypass

function is implemented to bypass this 64-bit gasket if it is not needed.

eMMA_lt supports the following image/video processing features:

• Pre-processor:

— Data input:

– System memory

– Private DMA between CMOS Sensor Interface module and pre-processor

— Data input formats:

– Arbitrarily formatted RGB pixels (16 or 32 bits)

– YUV 4:2:2 (Pixel interleaved)

– YUV 4:2:0 (IYUV, YV12)

— Input image size: 32 × 32 to 2044 × 2044

— Image scaling:

– Programmable independent CH-1 and CH-2 resizer. Can program to be in cascade or

parallel.

– Each resizer supports downscaling ratios from 1:1 to 8:1 in fractional steps.

— Channel-1 output data format

– Channel 1

– RGB 16 and 32 bpp

– YUV 4:2:2 (YUYV, YVYU, UYVY, VYUY)

— Channel-2 output data format

– YUV 4:2:2 (YUYV)

– YUV 4:4:4

– YUV 4:2:0 (IYUV, YV12)

– RGB data and YUV data format can be generated concurrently

— 32/64-bit AHB bus

• Post-processor

— Input data:

– From system memory

— Input format:

– YUV 4:2:0 (IYUV, YV12)

— Image Size: 32 × 32 to 2044 × 2044

i.MX27 and i.MX27L Data Sheet, Rev. 1.8

14

Freescale Semiconductor

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