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FPD85310 датащи(PDF) 20 Page - National Semiconductor (TI) |
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FPD85310 датащи(HTML) 20 Page - National Semiconductor (TI) |
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20 / 29 page ![]() Functional Description (Continued) DS101086-10 Note 21: RSTZ transition Low-to-High occurs at the completion of the RPLLS delay or later as shown above. Note 22: All outputs* forced low in default timing of FPD85310 during power-up delay time. Note 23: All outputs** forced low in continuous download (every two frame) mode. Note 24: All outputs*** generate the signal for default values in FPD85310 and unknown values when use the EEPROM values during power-up delay time. Then NS recommend to use the continuous download mode. Note 25: EEPROM download occurs at first detected vertical blanking period. Note 26: Active outputs depends on INPUT FORMAT register bits [5:6]. INPUT FORMAT [5:6] VSYNC# at which outputs go active 00 Second VSYNC 01 Third VSYNC 10 Fourth VSYNC 11 Fifth VSYNC Note 27: When configured in ENAB Only Mode (EOM), VSYNC signals are unused except for timing EEPROM DownLoad Sequences. When configured with de- fault values in Fixed Vertical mode, the VSYNC signal is generated any time ENAB remains low for more than 2 horizontal periods. During Power Up, before Reset has propagated, the EEPROM may receive spurious addressing that initiates a down load sequence, but the output data is often not captured for lack of timing alignment with VSYNC. In the case where EEPROM data is not captured during the initial (automatic) Reset or Power Up DownLoad sequence, Timing Controller outputs are indeterminate until the EEPROM data is successfully loaded, which always begins and is executed at the next VSYNC valid (low) cycle. Note 28: During Power Up sequences, false RSTZ signals are possible due to instability of the power supply level, typically within the 10 ms of operation. To avoid this situation, implementation of the circuit in Figure 17, or other functional equivalent, is recommended, (Figure 17). FIGURE 16. Power-up Sequence (INPUT FORMAT[6:5] = “01”) www.national.com 20 |
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