AP0101CS datasheet(33/42 Pages) ONSEMI

33 / 42 page

AP0101CS/D Rev. 7, 1/16 EN

©Semiconductor Components Industries, LLC,2016.

AP0101CS HDR: Image Signal Processor (ISP)

Usage Modes

Device Configuration and Usage Modes

After power is applied and the device is out of reset (either the power on reset, hard or

soft reset), it will enter a boot sequence to configure its operating mode. There are essen-

tially three configuration modes: Flash/EEPROM Config, Auto Config, and Host Config.

The AP0101CS firmware supports a System Configuration phase at start-up. This

consists of four sub-phases of execution:

1. Flash detection, then one of:

a. Flash Config

b. Auto Config

c. Host Config

The System Configuration phase is entered immediately following power-up or reset.

Then the firmware performs Flash Detection.

Flash Detection attempts to detect the presence of an SPI Flash or EEPROM device:

• If no device is detected, the firmware then samples the SPI_SDI pin state to determine

the next mode:

– If SPI_SDI is low, then it enters the Host-Config mode.

– If SPI_SDI is high, then it enters the Auto-Config mode.

• If a device is detected, the firmware switches to the Flash-Config mode.

In the Flash-Config mode, the firmware interrogates the device to determine if it

contains valid configuration records:

• If no records are detected, then the firmware enters the Auto-Config mode.

• If records are detected, the firmware processes them. By default, when all Flash

records are processed the firmware switches to the Host-Config mode. However, the

records encoded into the Flash can optionally be used to instruct the firmware to

proceed to auto-config, or to start streaming (via a Change-Config).

In the Host-Config mode, the firmware performs no configuration, and remains idle

waiting for configuration and commands from the host. The System Configuration

phase is effectively complete and the AP0101CS will take no actions until the host issues

commands.

In the Auto-Config mode, the part will start streaming with the default settings.

Usage Modes

How a camera based on the AP0101CSwill be configured depends on what features are

used. In the simplest case, an AP0101AT operating in Auto-Config mode with no custom-

ized settings might be sufficient.

In the simplest case no EEPROM or Flash memory or µC is required, as shown in

Figure 22.

Figure 22:

Auto-Config Mode

Digital Out

Auto-Config Mode

AP0101CS + image sensor

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