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DLPC900_V01 Datasheet(Hoja de datos) 44 Page - Texas Instruments

No. de Pieza. DLPC900_V01
Descripción  DLPC900 Digital Controller for Advanced Light Control
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Fabricante  TI1 [Texas Instruments]
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Notice carefully that the addresses from CS2 to CS0 are not ascending linearly in Figure 20. Therefore, an image
cannot span across CS2 and CS0. If an image cannot entirely fit in CS2, then the entire image must be moved
and stored in CS0. The DLP LightCrafter 6500 and 9000 GUI software automatically checks for this and performs
the necessary image adjustments to store the images into the flash memory. Minimizing Memory Space
Depending on the application design requirements of the product, the amount of memory may be reduced. This
may include reducing the number of flash memory components or the memory size of the flash memory
As you can see from Figure 20, the firmware resides in CS1, and the amount of memory the firmware occupies
is usually less than 1 Mbit. With this in mind, the design engineer can conclude that memory is only required to
be present on CS1 if no images are needed for the design.
For example, if the application design only requires the DLPC900 to operate in Video Mode, then the flash
memory components on CS0 and CS2 are not required and can be left out. Moreover, since the firmware only
occupies about 1 Mbit of memory, then a smaller density flash memory component can be used such as a 4-Mbit
rather than a 16-Mbit component. Figure 21 shows the memory space for this example.
Figure 21. One 4-Mbit Flash Memory
The same memory space shown in Figure 21 also applies to Video Pattern Mode. In this mode, the images are
streamed from an external video source directly into the internal memory of the DLPC900. Another operating
mode that can use this same memory configuration is Pattern On-The-Fly Mode because the images are
streamed over the USB or I2C interfaces directly into the internal memory of the DLPC900. These three operating
modes are excellent opportunities for minimizing the flash memory because they don’t require images to be
stored in flash memory.
However, there exists one mode that may require additional memory because this mode requires images to be
stored in flash memory. When the DLPC900 is operating in Pre-Stored Pattern Mode, the DLPC900 reads all the
required images from flash memory into its internal memory when the pattern sequence is started. The amount of
flash memory depends on the needs of the application.
For example, if the application design requires only a few images, and the images and firmware can fit in one 4-
Mbit flash component, then the memory space in Figure 21 can be used. However, if more memory is needed,
then one 8-Mbit or one 16-Mbit flash component can be used as shown in Figure 22 and Figure 23.
Figure 22. One 8-Mbit Flash Memory

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