Samsung DSB-S300G Service Manual

Also see for DCB-P850Z: Instructions for use

Circuit Operating DescriptionsSamsung Electronics 13-513-3-4 Transport stream processingThe STi5100/STi5101 supports dual independent transport stream inputs using an SRAM-basedpacket merger and a single programmable transport interface (PTI). The mergerbuffers a packet tagged with a source ID and a time stamp.The merger is able to produce an output stream (1394) from the PTI alternate output orthe SWTS interface which is an STBus target normally fed by the central DMA. Theoutgoing packets are buffered in the merger and are presented to the output pins using adejittering mechanism that compares each packet time stamp with a fixed programmableoffset.The PTI alternate output allows the entire transport stream or selected packets to beoutput through the merger to an external device such as an IEEE1394 link layer controller.The TS0IN input is by default a serial transport input. However, it may be extended to afull parallel input by using additional PIO pins (alternatively used as the second smartcardinterface).Multiplexing in front of the merger block provides a bypass route to allow for CableCardand DVB-CI support. This provides a parallel loop back path between TS0 and TS2 wherethe normally serial TS0 is augmented using PIO bits. If the TS0 input is serial only thenthe loopback path can still be provided but is done inside the merger block which performsthe serial to parallel conversion. This allows a serial-only front-end to be used with DVB-CI.TS1IN is a fully parallel input that may accept a standard transport stream or D1 raw data.An internal multiplexor routes this to the stream merger’s upper port, which has an internalby-pass directly to the PTI. D1 header processing and buffering is performed by the PTI.Transport deMUX and D1 processing may not be performed simultaneously.1) Block diagram: Transport stream merger inputs and outputsfig. 13-4