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BT868KRF

Flicker-Free Video Encoder with Ultrascale™ Technology

Conexant Systems 

1.0 Functional Description

1.3 Circuit Description

Bt868/Bt869

Flicker-Free Video Encoder with UltrascaleTM Technology

1.3.4 Device Initialization

After a reset condition, the device must be programmed through the serial

interface to activate video or output one of the other video standards and to enable

the CLK0, HSYNC*, VSYNC*, and FIELD outputs.

1.3.5 Auto Configuration

The device can configure itself for one of eight combinations of video formats

and input modes with a single register write. Tables 1-5 and 1-6 detail the eight

available auto configuration modes. This feature reduces the software support

required, yet allows full flexibility in generating video formats and timing. Once

the device is configured, all the registers are accessible to modify the modes. For

less common modes, the device can be configured for the closest mode, and only

those registers that differ need to be programmed. To auto-configure the device,

set the configuration bits (CONFIG[2:0]) to the desired mode. The device will

initialize the first 32 registers (registers 0x3B to 0x5A), setting the BUSY flag in

the process. When complete, the BUSY flag is cleared. The serial interface is not

available when the BUSY flag is high except for monitoring the status register.

If the mux mode is enabled, pins P[23:21] can also be used to externally

configure the device to any one of the eight configuration modes. These pins

directly emulate the CONFIG[2:0] register. In order to configure the device in

this way, the EN_PINCFG register must be set. The desired state must be present

on the P[23:21] pins for at least two clock cycles.

1-10

Conexant

100123B

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