AS0260CSSC28SUD20 datasheet(63/83 Pages) ONSEMI

63 / 83 page

AS0260 DS Rev. G Pub. 5/15 EN

©Semiconductor Components Industries, LLC, 2015.

AS0260: 1/6-Inch 1080P High-Definition (HD) System-On-A-Chip (SOC) Digi-

tal Image Sensor

Theory Of Operation

When multiple AS0260 devices have been connected and configured as described above,

the multi-sync function operates as follows:

When the master device is placed in streaming mode (as the result of a mode change

initiated by the host) it generates an event on its CHAIN output. It then delays its own

streaming until the last of the slave devices has received an event signal.

When a slave device is placed in streaming mode (as the result of a mode change initi-

ated by the host) it delays streaming until it has received an event on its SADDR input.

Each slave in the daisy-chain propagates events received on its input. Each slave uses its

local value of “position” to delay its respond to an event. This allows an event propagated

down the daisy-chain to be acted upon simultaneously by all devices in the daisy-chain.

Using Multi-Sync

The host can use the normal mechanism to configure the AS0260 and set them

streaming. It can do this in any order provided that it sets the master streaming last.

It is desirable (but not essential) for the master to be taken out of streaming mode first

(by using a host command).

At the time that the AS0260 are placed in streaming mode, all AS0260 must have the

same integration time The recommended mechanism is:

1) Boot each device into standby by enabling 'host-config' mode.

2) Reconfigure each device.

3) Wake each device and commence streaming using the Leave Standby command.

The AS0260 need not maintain the same integration time once they are streaming.

All the AS0260 must be operated with the same configuration (image size, output format,

PLL bypassed and frame timing). Any time that the configuration is to be changed, all

AS0260 must be taken out of streaming mode (using host command), reconfigured, then

placed back in streaming mode (master last). This will allow the output data to remain in

synchronisation.

Clocking

The multi-sync mechanism requires that all AS0260 devices in the daisy-chain are oper-

ated synchronously on the same input clock. This constraint is imposed in order to allow

the event codes to be propagated synchronously from the master through to each slave.

Once this constraint has been met, the AS0260 devices are required to operate in exact

synchronisation (such that a PIXCLK, FRAME_VALID and LINE_VALID out of one

AS0260 is valid for all AS0260 in the daisy-chain). In this case, the AS0260 internal PLL

must be bypassed (and the AS0260 must be using parallel output data).

AptiSync2 (Auto-Sync)

An additional control is available to synchronize the auto exposure and auto white

balance functions of two image sensors. No additional hardware connections are

needed to support this control.

AS0260CSSC28SUD20 数据表(PDF) 63 Page - ON Semiconductor

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