MCIMX281AVM4B Freescale Semiconductor, MCIMX281AVM4B Datasheet - Page 2122

• Manufacturer Part Number: MCIMX281AVM4B
• Description: IC MPU I.MX28 1.2 289MAPBGA
• Manufacturer: Freescale Semiconductor
• Series: i.MX28r

Specifications of MCIMX281AVM4B

• Core Processor: ARM9
• Core Size: 32-Bit
• Speed: 454MHz
• Connectivity: CAN, EBI/EMI, Ethernet, I²C, MMC, SmartCard, SPI, SSI, UART/USART, USB OTG
• Peripherals: DMA, I²S, LCD, POR, PWM, WDT
• Program Memory Size: 128KB (32K x 32)
• Program Memory Type: Mask ROM
• Ram Size: 32K x 32
• Voltage - Supply (vcc/vdd): 1.25 V ~ 5.25 V
• Data Converters: A/D 17x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 289-LFBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of I /o: -
• Eeprom Size: -
• Lead Free Status / Rohs Status: Supplier Unconfirmed

Operation
Output pixels will retain the effective alpha value of the overlay or can be set to a
programmed alpha value using the ALPHA field of the S0PARAM register. 16-bit pixels
values are formed from the most significant bits of the 24-bit pixel values.
34.2.2 S0 Cropping/Masking
The PXP's cropping operation should be viewed as a mask on the output image through
which the background S0 plane can be viewed. Using this definition clarifies a subtlety on
the usage of cropping an image when the image is scaled. When scaling is not used, the
input and output image sizes are the same, therefore, the operation is analogous to cropping
the input source image.
The background output image can be cropped to a width and height independent of the
image size at a given offset into the image (all sizes are in terms of block size pixel units)
using the values in the S0CROP register. The XBASE and YBASE provide the coordinates
of the first block to be displayed from the source image and the WIDTH and HEIGHT
parameters specify an effective size of the resulting image in the output buffer.
Cropping must be enabled by setting the CROP bit in the CTRL register to a 1. When not
set, the visible portions of the S0 image will be rendered based on the WIDTH and HEIGHT
specified in the S0SIZE field. The following figure indicates how the various cropping
parameters relate to the source and RGB images (non-scaled case).
It is important to note that when scaling an image, software must specify a valid cropping
region since the PXP will default to using the source image size. When downscaling, this
is not an issue, but with upscaling the resulting image will be a scaled up version of the
source, but cropped to the same size as the source image as shown below.
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• When not resizing the input image, the input pixels are still processed through the
• S1, or overlays cannot be supported in this case since S1 RGB pixels cannot be converted
scaling engine to convert 4:2:2 or 4:2:0 formats to 4:4:4 formats. Essentially, the chroma
values are resized to contain a unique chroma sample for each pixel site.
to YUV/YCbCr.
i.MX28 Applications Processor Reference Manual, Rev. 1, 2010
Figure 34-4. Pixel Pipeline (PXP) Cropping
clip xbase
clip ybase
S0 Buffer
S0 width
clip width
clip height
s0 xbase
s0 ybase
RGB width
RGB Buffer
clip width
clip height
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