GS3471 datasheet(33/179 Pages) SEMTECH

33 / 179 page

GS3471

Final Data Sheet Rev.4

PDS-060498

September 2017

33 of 179

Semtech

www.semtech.com

When operating in 10-bit mode (20BIT_10BIT = LOW), the output data format is

multiplexed Luma and Chroma data. In this mode, the data is presented on the

DOUT[19:10] pins, with DOUT[9:0] being forced LOW. For SD/ HD data rates, the clock is

either at the 10-bit word rate or at half of this rate (DDR mode). For 3G data rates, the

clock is always at half the 10-bit word rate (DDR mode).

4.11.3 Parallel Output in DVB-ASI Mode

The DVB-ASI mode of the GS3471 is enabled when the SMPTE_BYPASS bit is LOW and

the DVB_ASI bit is HIGH.

The extracted 8-bit data is presented on DOUT[17:10] such that DOUT[17:10] = HOUT ~

AOUT, where AOUT is the least significant bit of the decoded transport stream data.

In addition, the DOUT19 and DOUT18 pins are configured as DVB-ASI status signals

WORDERR and SYNCOUT respectively.

SYNCOUT is HIGH whenever a K28.5 sync character is output from the device.

WORDERR is HIGH whenever the device has detected a running disparity error or illegal

code word.

DOUT[9:0] is forced LOW, when the GS3471 is operating in DVB-ASI mode.

The clock is either at the 10-bit word rate or at half of this rate (DDR mode).

4.11.4 Parallel Output in Data-Through Mode

This mode is enabled when the SMPTE_BYPASS and DVB_ASI bits are LOW.

In this mode, data is passed to the output bus without any decoding, descrambling, or

word-alignment.

GSPI can be used to set the output data width to either 10-bit or 20-bit, adjust the drive

strength of the outputs and enable DDR mode.

The output data width (10-bit or 20-bit) can also be controlled through the 20BIT_10BIT

pin.

4.11.5 Parallel Output Data Format Clock/PCLK Settings

The PCLK output frequency of the GS3471 is determined by the output data format.

Table 4-6 lists the output signal formats according to the external selection pins for the

GS3471.

GS3471 数据表(PDF) 33 Page - Semtech Corporation

GS3471 数据表(HTML) 33 Page - Semtech Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载