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ASX340CS датащи(PDF) 42 Page - ON Semiconductor |
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ASX340CS датащи(HTML) 42 Page - ON Semiconductor |
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42 / 74 page ![]() ASX340CS_DS Rev. F Pub. 6/15 EN 42 ©Semiconductor Components Industries, LLC, 2015. ASX340CS: 1/4-Inch Color CMOS NTSC/PAL Digital Image Sensor Serial Memory Partition Serial Memory Partition The contents of the Flash/EEPROM memory partition logically into three blocks (see Figure 24): • Memory for overlay data and descriptors • Memory for register settings, which may be loaded at boot-up • Firmware extensions or software patches; in addition to the on-chip firmware, exten- sions reside in this block of memory These blocks are not necessarily contiguous. Figure 24: Memory Partitioning External Memory Speed Requirement For a 2KB block of overlay to be transferred within a frame time to achieve maximum update rate, the serial memory has to be a certain speed. Table 20: Transfer Time Estimate Frame Time SPI Clock Transfer Time to 2KB 33.3ms 4.5 MHz 1ms S/W Patch Alternate Reg. Overlay Data FFlash Partitioning Fix ed Siz e Overlays- RL E 12Byte Header RL E Encoded Data 2kByte Fix ed Siz e Overlays- RL E Fixed-size Overlays – RLE Fixed-size Overlays – RLE Flash Partitioning Overlay Data Software Patch 12-byte Header RLE Encoded Data 2KB Lens Shading Correction Parameter Alternate Register Setting |
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