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BT860-BT861 Datasheet(PDF) 17 Page - Synaptics Incorporated. |
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BT860-BT861 Datasheet(HTML) 17 Page - Synaptics Incorporated. |
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17 / 111 page  D860DSA Conexant 2-1 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. |
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