Datenblatt-Suchmaschine für elektronische Bauteile |
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LM2506GR Datenblatt(PDF) 9 Page - National Semiconductor (TI) |
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LM2506GR Datenblatt(HTML) 9 Page - National Semiconductor (TI) |
9 / 19 page Functional Description (Continued) Pixel bandwidth is equal to display resolution times color depth times frame rate. Net Bandwidth = (Pixel BW)(24/18)(1.0 + % Blanking) Net bandwidth is equal to the pixel bandwidth times the overhead times the blanking overhead. PCLK Rate = Net Bandwidth / 24 The PCLK rate is equal to the net bandwidth divided by the total number of bits. Format Hor. Pixels Ver. Pixels Color Depth Frames fps Pixel BW Mbps Percent Blanking Net BW Mbps PCLK rate MHz 1 ⁄2SVGA 800 300 18 50 216 10 316 13.2 3 ⁄4VGA 640 320 16 55 180 10 265 11 1 ⁄2VGA 320 480 18 55 152 10 223 9.3 QVGA 320 240 18 55 76 20 122 5.1 Other RGB Color Depths When transporting color depth below 18-bit, the 18-bit pro- tocol can be used by offsetting the color data. The LSBs of the RGB are not used and data is offset toward the upper (MSB) end of the bit fields. Unused inputs should be tied off. Parity Error Output Parity Status is output as a pulse on the Parity Error (PE) output pin (DES) whenever there is a parity error. These pulses could be counted or used by various diagnostic equipment. PE is a high going pulse that is 3 MC cycles long for each frame containing an error. The PCLK output can be used to sample the PE bit. SET time is nominally 2 MC cycles and a HOLD time of 1 MC cycle. The serial PE bit is Odd Parity and is based on the RGB, and Control (VS, HS, DE) bits only. See Figure 10. SYNCHRONIZATION DETECT AND RECOVERY If a data error or clock slip error occurs over the MPL link, the LM2506 can detect this condition and recover from it. The method chosen is a data transparent method, and has very little overhead because it does not use a data expansion coding method. For the 18-bit color transaction (or frame), it 201255024 FIGURE 9. 18-bit RGB Display Mode Transaction 20125550 FIGURE 10. PE Output Timing www.national.com 9 |
Ähnliche Teilenummer - LM2506GR |
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Ähnliche Beschreibung - LM2506GR |
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