Philips BJ2.4U Service Manual

Circuit Descriptions, Abbreviation List, and IC Data SheetsEN 132 BJ2.4U/BJ2.5U PA9.allow selection of the output out of five L+R inputs, two monosignals (AM internal or AM external) and two externallyconnected DSND streams.SIF SwitchingSIF (Sound Intermediate Frequency) switching allowsselecting between internal or external SIF signals.AD ConvertersThe second part of the MPIF is responsible for conversion ofthe chosen signals into digital signals and grouping them intothree data streams. Each data stream handles both video andaudio. These data streams are fed into three data links andsend via I2D to the outside.The MPIF contains four video ADCs for analog and digitalvideo broadcast signals. The clock frequency for these ADCsis either 27 MHz or 54 MHz. In some cases, two analog signalsare multiplexed at the input of one ADC. In these cases, theclock frequency of the ADCs is 54 MHz, while the samplefrequency for each of the two signals is 27 MHz.The sample frequency for standard 1fH video signals is 27MHz. For the YUV channel the sample frequency of the U andV components is half the sample frequency of the Y signal.For 2fH YPbPr or RGB input signals (for instance 480p or 1080iATSC signals), the frequency that is used to sample the YUVsignals is twice as high as for 1fH signals. The samplefrequency is 54 MHz for Y and 27 MHz for U and V.Due to the high sample frequency, two data links are neededfor transport of the video data to the digital video processor.I 2 D Data LinkThe digital interface between MPIF and AVIP is called DataLink (or I 2 D Link). This is a serial interface that transfers thedata from MPIF to AVIP over three Data Link interfaces. EachData Link has a data signal and a strobe signal. Thesynchronization information is distributed over the data and thestrobe signal. To minimize EMC, both signal outputs are lowvoltage differential swing signals, with a swing of about 300mV.Each Data Link has four lines, one differential pair for the data,and one differential pair for the strobe. The data rate is 594Mbit/s. Each Data Link can carry two 27 MHz sampled videostreams (or one 54 MHz sampled 2fH video stream) and twoaudio channels sampled at 6.75 MHz.In the MPIF, the (video and audio) data to be transmitted ismultiplexed in an output register of 44 bits (including the 2 bitsync information). The content of that 44 bits register is serialtransmitted on one of the three data links. In the AVIP, theserial data is de-multiplexed into parallel streams. The data onthe data link is divided in several groups of signals (video, audioand strobe signals). Obvious it is important that the transmitterand receiver are in the same transmitting modeData links can operate in two different modes called:1. Normal mode.2. YUV2fH.Normal ModeIn the normal mode the content of the data links is as follows:Table 9-2 Normal modeIn the normal mode the data links can handle up to three videosignals: CVBS or YC signal from the primary video selector,CVI 1fH source selected on the CVI switch, and CVBS signalfrom the secondary video selector.YUV 2fH ModeIn the YUV 2fH mode (higher bandwidth signal) the data linkscontent is as follows:Table 9-3 YUV 2fH modeThe data link 1 can output only one of two input signals: theoutput of the primary video selector or the Y output of the CVIswitch. Only one can be active at a moment, and that isdetermined by the data link mode bit (DM). It means, that fordata links working in YUV 2fH mode, the data link 1 carries theY component of the YUV 2fH signal, the data link 2 carries theUV component, and the data link 3 contains the signal that isconnected through the secondary video selector.9.7 PNX2015The functional blocks of the PNX2015 (item 7J00) are:• Audio Video Input Processor (AVIP).• 3D Comb Filter (COLUMBUS).• High Definition MPEG Decoder (HD Subsystem).• LVDS transmitter.• Stand-by Processor for low-power control.Figure 9-17 Block diagram PNX2015These different blocks are described separately in the nextparagraphs.Data Stream Video Audio1 CVBS/YC primary (L+R) primary2 YUV 1fH (L+R) secondary3 CVBS secondary SIFData link Mode bit: DM= 0Data Stream Video Audio1 Y 2fH (L+R) primary2 UV 2fH (L+R) secondary3 CVBS secondary SIFData link Mode bit: DM= 1AVIP-1DLINK1SYNCCOLUMBUS0-910-19VO-1memorycontrollerDV1DV2DV1MUXDV3MUXDV2MUXPNX8550direct0-910-19VO-2HUBPNX3000-1AVIP-2VIPDLINK2SYNCPNX3000-2DV4DV5videoSOUTHTUNNELRX/TXMBSMEMORYCONTROLLERVMPGLCD panelPNX8550DV3 PNX8550NORTHTUNNELRX/TXLVDS_TX TA, TB, TC, TD, TE, CLKHD SUBSYSTEMCOLMUXPNX2015RGB,HVPNX8550videocoprocessorPNX855016-bit200 MHzDDRDLINKDLINKVIDDEC DCU ITU656AUDIOVIDDEC DCU ITU656AUDIOTVMicrocontrollerPNX8550Power ControlDSP/DEMDECDSP/DEMDECSYNCF_15400_105.eps180505BLOCK DIAGRAM