ASX340CS datasheet(42/74 Pages) ONSEMI

42 / 74 page

ASX340CS_DS Rev. F Pub. 6/15 EN

©Semiconductor Components Industries, LLC, 2015.

ASX340CS: 1/4-Inch Color CMOS NTSC/PAL Digital Image Sensor

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

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