GS9062-CFE3 datasheet(25/46 Pages) GENNUM

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GS9062 Data Sheet

22209 - 7

February 2007

25 of 46

3.4 DVB-ASI Mode

The GS9062 is said to be in DVB-ASI mode when the SMPTE_BYPASS pin is set

LOW and the DVB_ASI pin is set HIGH.

In this mode, all SMPTE processing functions are disabled, and the 8-bit transport

stream data will be 8b/10b encoded prior to serialization.

3.4.1 Control Signal Inputs

In DVB-ASI mode, the DIN19 and DIN18 pins will be configured as DVB-ASI

control signals INSSYNCIN and KIN respectively.

When INSSYNCIN is set HIGH, the device will insert K28.5 sync characters into

the data stream. This function is used to assist system implementations where the

GS9062 may be preceded by an external data FIFO. Parallel DVB-ASI data may

be clocked into the FIFO at some rate less than 27MHz. The INSSYNCIN input

may then be connected to the FIFO empty signal, thus providing a means of

padding up the data transmission rate to 27MHz. See Figure 3-3.

NOTE: 8b/10b encoding will take place after K28.5 sync character insertion.

KIN should be set HIGH whenever the parallel data input is to be interpreted as any

special character defined by the DVB-ASI standard (including the K28.5 sync

character). This pin should be set LOW when the input is to be interpreted as data.

NOTE: When operating in DVB-ASI mode, DIN[9:0] become high impedance.

Figure 3-3: DVB-ASI FIFO Implementation using the GS9062

AIN ~ HIN

PCLK = 27MHz

INSSYNCIN

SDO

CLK_IN

CLK_OUT

FIFO

SDO

WRITE_CLK

<27MHz

KIN

GS9062

KIN

READ CLK

=27MHz

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