CXD1948R Просмотр технического описания (PDF) - Sony Semiconductor

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CXD1948R

IEEE1394 Link Layer LSI for DVB and DSS

Sony Semiconductor 

CXD1948R

5-2-4. Transmit Interface

The CXD1948R is designed for use not only in transmitting an entire input transport stream, but also in

transmitting one program only in the stream. The packet for transmission is selected through PACKETEN input

as in the diagram below.

Moreover, constraints are imposed in the packet intervals of streams that can be input to the CXD1948R.

Each time the CXD1948R receives one packet of transport stream data, it adds time stamp data and data from

the host I/F, and there must be an interval of 500ns or more for this processing. The timing is illustrated below.

Also, the PACKETEN input signal must input “HIGH” while the first data of the transport stream packet is being

sent. The maximum period for PACKETENABLE signal high is the period that the transport stream packet data

is valid.

The timing charts for synchronous/asynchronous interface are shown below.

Transmit Interface Limits

MPEG2 transporter

AIDT

PACKETEN

CXD1948R

Transmission of Program A

AIDT

A

B

A

A

B

A

A

PACKETEN

500ns (min)

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