AP0100CS datasheet(48/73 Pages) ONSEMI

48 / 73 page

AP0100CS HDR: Image Signal Processor (ISP)

Protocol

AP0100CS/D Rev. 6, Pub. 1/16 EN

©Semiconductor Components Industries, LLC,2016.

Device Configuration

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 AP0100CS firmware supports a System Configuration phase at start-up. This

consists of three sub-phases of execution:

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 AP0100CS will take no actions until the host issues

commands.

The Auto-Config mode uses the GPIO [5..2] pins to configure the operation of the device,

such as video format and pedestal (see Table 18, “GPIO Bit Descriptions in Auto-Config,”

on page 49). After Auto-Config completes the firmware switches to the Change-Config

mode.

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