Philips BJ2.4U Service Manual

Circuit Descriptions, Abbreviation List, and IC Data Sheets EN 127BJ2.4U/BJ2.5U PA 9.9.3 Inputs9.3.1 USBThese chassis have different USB specifications:• Top and step styling (chassis BJ2.5 and BJ2.4) featuresUSB2.0. This USB version is hosted by a separate IC(7N00) which communicates with the VIPER via a PCI bus.• Entry styling (chassis BJ2.5) features USB1.1. This USBversion is hosted directly by the VIPER.Each USB port has four lines:1. 5V (red).2. D- (white).3. D+ (green).4. GND (black).Figure 9-8 USB configurationsUSB1.1The USB1.1 is a hardware block in the VIPER. There are twoUSB ports. Each port has a D+ and D- line; this is thedifferential signal path for USB. There is also one over-currentdetect and power enable line that is used for both ports (theselines are controlled by VIPER).A tandem USB connector is mounted on the SSB, on which youcan connect two USB devices; one device will be the SCMdigital media card-reader. Only USB mass storage class deviceis supported, so other USB devices (card-readers) have to becompliant with this class.The host (= SSB) needs to provide the power supply to theattached devices (like memory cards or other USB devices).Since it is not known what the customer will attach (e.g. a USBhub with multiple USB devices), and these USB devices drawcurrent from the SSB, these supply lines must be protectedagainst over-current and/or too many connected devices.This is controlled by the VIPER via the USB_OVERCUR line(see diagram B5A): when more then 500 mA per channel isdrawn from the USB ports, the protection becomes active (="high").During stand-by, when there is no +5V available (and VIPER isnot active), the USB port does not work. This is controlled bythe VIPER via the USB_BUS_PW line (see diagram B5A),which switches the 5V input to the outputs of IC7Q01.USB2.0Figure 9-9 Multimedia card reader assy9.3.2 HDMIIntroductionNote: Text below is an excerpt from the ”HDMI Specification”that is issued by the HDMI founders (see http://www.hdmi.org).This High-Definition Multimedia Interface is developed fortransmitting digital television audiovisual signals from DVDplayers, set-top boxes and other audiovisual sources totelevision sets, projectors and other video displays.HDMI can carry high quality multi-channel audio data and cancarry all standard and high-definition consumer electronicsvideo formats. Content protection technology is available.HDMI can also carry control and status information in bothdirections.As shown in the HDMI block diagram, the HDMI connectorcarries four differential pairs that make up the TMDS(Transition Minimized Differential Signalling) data and clockchannels. These channels are used to carry video, audio, andauxiliary data. In addition, HDMI carries a VESA DDC channel.The DDC is used for configuration and status exchangebetween a single source device and a single sink device.VIPERUSB Aconn CardReaderUSBcableUSB 1.1HOST 5VCurrentlimiterVIPERconn CardReaderUSBcableUSB 1.1HOST 5VCurrentlimiterUSB 1.1ENOCISP1561CardReaderUSBcablepowercableVIPERPCIUSB 2.0HOSTNot usedUSB AconnCardReaderUSBcable5V powercableUSB 2.0F_15400_108.eps250505USB 2.0 slot APOWER+5VGNDUSB 2.0D+D-USB2.0HUBmediainterfaceSUPPLYprotectionprotection5V5VenableovercurrentovercurrentenableCard slot 0Card slot 1CF I, CFII, MDMS, MSpro, SD,MMC, SM, xDUSB 2.0 slot B+5VD -D +GND+5VD -D +GNDUSB2.0USB 2.0USB 2.0USB2.0Cardreader USB 2.0F_15400_109.eps180505