AS0260CSSC28SUD20 datasheet(62/83 Pages) ONSEMI

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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

There is a single register to control this function, named CHAIN_CONTROL (R0x31FC).

This register is controlled by the host. The register field assignment is shown in Table 17.

Configuration

Before the multi-sync function can be used, each AS0260 in the daisy-chain must be

configured. This process is performed by the host with no involvement from AS0260

firmware. Configuration involves assigning a unique slave address to each AS0260 and

configuring the CHAIN_CONTROL register on each AS0260.

After reset (before configuration) the master AS0260 has its SADDR input wired to '0' and

all other AS0260 in the daisy-chain have their SADDR inputs driven to '1'. Therefore,

AS0260 Master will respond to slave address ID0 (associated with SADDR = 0) and all the

other AS0260 in the daisy-chain will respond simultaneously to slave address ID1. Each

AS0260 has its CHAIN pin configured as an input. This situation is shown in Figure 33.

The host configures each AS0260 in sequence, starting with the master and ending with

the farthest slave in the daisy-chain:

• AS0260(1) Master: The host uses slave address ID0 (associated with SADDR = 0) and

therefore accesses registers on AS0260(1) (the master). It writes to register (R0x002E)

to change the slave addresses associated with ID0 and ID1 on this device to a single,

new, unique value; call it ID-AS0260(1). It then writes (using AS0260(1) to register

PAD_CONTROL (R0x0032) to configure CHAIN as an output. Finally, it writes (using

AS0260(1)) to the CHAIN_CONTROL register to set chain_enable =1, sync_enable=1,

master=1 and position = N – 1 (where there are N devices in the daisy-chain). The

effect of enabling TMS as an output is to drive the TMS output low.

• AS0260(2): This AS0260 now has SADDR=0 and so will respond to slave address ID0.

The host configures this in the same way as AS0260(1) with the exceptions that it

assigns ID-AS0260(2), sets master=0 and position = N-2 (where there are N devices in

the daisy-chain). As before, the effect of enabling CHAIN as an output is to drive the

CHAIN output low.

• AS0260(3): As for AS0260(2): assign ID-AS0260(3), master=0, position = N-3

• AS0260(4): As for AS0260(2): assign ID-AS0260(4), master=0, position = N-4

Table 17:

CHAIN_CONTROL Register

Bit

Name

Default Description

chain_enable

0: multi-camera daisy-chain communication function is disabled.

1: multi-camera daisy-chain communication function is enabled.

The result of toggling this bit while the sensor is streaming is UNDEFINED.

sync_enable

0: multi_sync function is disabled.

1: multi-sync function is enabled.

The result of toggling this bit while the sensor is streaming is UNDEFINED.

master

0: this node is not the master.

1: this node is the master.

The result of toggling this bit while the sensor is streaming is UNDEFINED.

RESERVED

11:8

position

A unique value assigned to each device in the daisy-chain. The device furthest from the

master is assigned a position value of 0. The next device is assigned a position value of 1.

For N devices in a daisy-chain, the master is assigned a position value of N-1.

The result of toggling this bit while the sensor is streaming is UNDEFINED.

7:0

RESERVED

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