GS9060 datasheet(35/61 Pages) GENNUM

35 / 61 page

GS9060 Data Sheet

22208 - 8

January 2007

35 of 61

3.8.1 Transport Packet Format

Transport packet structure shall conform to the specifications of EN/ISO/IEC

13818-1 and ETS 300 429 for Transport Stream Packets. The packet length can

be 188 or 204 bytes.

3.8.2 DVB-ASI 8b/10b Decoding and Word Alignment

After serial-to-parallel conversion, the internal 10-bit data bus is fed to the DVB-ASI

8b/10b decode and word alignment block. The function of this block is to word align

the data to the K28.5 sync characters, and 8b/10b decode and bit-swap the data

to achieve bit alignment with the data outputs.

The extracted 8-bit data will be presented to DOUT[17:10], bypassing all internal

SMPTE mode data processing.

NOTE: When operating in DVB-ASI mode, DOUT[9:0] are forced LOW.

3.8.3 Status Signal Outputs

In DVB-ASI mode, the DOUT19 and DOUT18 pins will be configured as DVB-ASI

status signals SYNCOUT and WORDERR respectively.

SYNCOUT will be HIGH whenever a K28.5 sync character is present on the output.

This output may be used to drive the write enable signal of an external FIFO, thus

providing a means of removing the K28.5 sync characters from the data stream.

Parallel DVB-ASI data may then be clocked out of the FIFO at some rate less than

27MHz. See Figure 3-4.

WORDERR will be high whenever the device has detected an illegal code word.

Figure 3-4: DVB-ASI FIFO Implementation using the GS9060

AOUT ~ HOUT

WORDERR

PCLK = 27MHz

SYNCOUT

DDI

CLK_IN

CLK_OUT

FIFO

DDI

READ_CLK

<27MHz

WORDERR

GS9060

GS9060 Datasheet(PDF) 35 Page - Gennum Corporation