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CS5530 数据表(PDF) 35 Page - National Semiconductor (TI) |
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CS5530 数据表(HTML) 35 Page - National Semiconductor (TI) |
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35 / 241 page  Revision 4.1 35 www.national.com Signal Definitions (Continued) DDC_SDA M4 I/O 5VT DDC Serial Data This is the bidirectional serial data signal for the VESA Display Data Channel interface. It is used to monitor communications. The DDC2B standard is supported by this interface. The direction of this pin can be configured through F4BAR+Memory Off- set 04h[24]: 0 = Input; 1 = Output. IREF (Video DAC) R3 I Analog VDAC Current Reference Input Connect a 732 ohm resistor between this pin and AVSS (analog ground for Video DAC). VREF (Video DAC) T1 I Analog VDAC Voltage Reference Output Unused DAC output. Connect a 0.1 µF capacitor between this pin and AVSS (analog ground for Video DAC). EXTVREFIN (Video DAC) T2 I Analog External Voltage Reference Pin When using an external voltage reference, connect this pin to a 1.235V voltage reference. AVDD1 (DAC) U1 I Analog Analog Power for Video DAC These pins provide power to the analog portions of the Video DAC. AVDD2 (VREF) T3 AVDD3 (DAC) N4 AVSS1 (DAC) R2 I Analog Analog Ground for Video DAC These pins provide the ground plane connections to the analog portions of the Video DAC. AVSS2 (ICAP) R4 AVSS3 (VREF) T4 AVSS4 (ICAP) P1 AVSS5 (DAC) P2 IOUTR (Video DAC) P3 O Analog Red DAC Output Red analog output. IOUTG (Video DAC) P4 O Analog Green DAC Output Green analog output. IOUTB (Video DAC) R1 O Analog Blue DAC Output Blue analog output. Display TFT/TV FP_DATA17/ MASTER# F3 O Limited ISA Mode: Flat Panel Data Port Line 17 Refer to FP_DATA[15:0] signal description. I ISA Master Mode: Master Refer to Section 2.2.5 “ISA Bus Interface” on page 27 for this signal’s def- inition. FP_DATA16/ SA_OE# H3 O Limited ISA Mode: Flat Panel Data Port Line 16 Refer to FP_DATA[15:0] signal description. O ISA Master Mode: System Address Transceiver Output Enable Refer to Section 2.2.5 “ISA Bus Interface” on page 27 for this signal’s def- inition. 2.2.11 Display Interface (Continued) Signal Name Pin No. Type Description |
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