BT835 Ver la hoja de datos (PDF) - Conexant Systems

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BT835

Multiport YCrCb to NTSC / PAL / SECAM Digital Video Encoder

Conexant Systems 

2

2.0 Inputs and Timing

2.1 Reset

The Bt860/Bt861 has the following reset methods:

• power-up reset

• RESET* pin reset

• software reset register bit

Power-up reset occurs when the part is powered-up. A pin reset occurs when

the RESET* pin is held low. (It is recommended that the pin be held low for a

minimum of 50 system clock cycles.) Both power-up and pin reset cause the

initialization of all chip functions, including video timing and serial programming

registers.

Writing a 1 to register bit SRESET (1B[7]) resets all serial programing

registers to their default states, listed in Section 5.0.

2.1.1 Initialization and Power-up Configuration

At power-up all registers reset to their initial values (see Section 5.0).

The state of the FIELD pin at power-up (or pin reset) determines the default

state of the PCLK_SEL register bit and the initial clock source. If the FIELD pin

is pulled high, the initial clock source is the CLKIN pin; if the FIELD pin is

pulled low, the initial clock source is from the PLL and requires a crystal at the

XTI and XTO pins. If not loaded, the FIELD pin is pulled low with the pin’s

internal pull-down resistor.

The power-up configuration is interlaced NTSC-M, 27 MHz black burst

video, as listed in the default values of the register bit map.

NOTE: To enable active video, black burst video must be turned off by setting

register bit EACTIVE (1D[1]) to 1. Other video configurations must be

programmed using the part’s serial programming interface registers.

D860DSA

Conexant

2-1

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