GS1662 Datasheet, PDF (29/73 Pages) Gennum Corporation – Integrated Cable Driver

Table 4-3: GS1662 PCLK Input Rates (Continued)
Input Data Format
Pin Settings
20-bit demultiplexed
SD format
20-bit data input
SD format
10-bit multiplexed
HD format
10-bit data input
HD format
10-bit multiplexed
SD format
10-bit data input
SD format
10-bit ASI input
SD format
20BIT/10BIT
HIGH
HIGH
LOW
LOW
LOW
LOW
LOW
RATE_
SEL
HIGH
HIGH
LOW
LOW
HIGH
HIGH
HIGH
SMPTE_
BYPASS
HIGH
LOW
HIGH
LOW
HIGH
LOW
LOW
DVB-ASI
LOW
LOW
LOW
LOW
X
LOW
HIGH
4.3 SMPTE Mode
The function of this block is to carry out data scrambling according to SMPTE 292M, and
to carry out NRZ to NRZI encoding prior to presentation to the parallel to serial
converter.
These functions are only enabled when the SMPTE_BYPASS pin is HIGH.
In addition, the GS1662 requires the DVB_ASI pin to be set LOW to enable this feature.
4.3.1 H:V:F Timing
In SMPTE mode, the GS1662 can automatically detect the video standard and generate
all internal timing signals. The total line length, active line length, total number of lines
per field/frame and total active lines per field/frame are calculated for the received
parallel video.
When DETECT_TRS is LOW, the video standard and timing signals are based on the
externally supplied H_Blanking, V_Blanking, and F_Digital signals. These signals are
supplied by the H/HSYNC, V/VSYNC and F/DE pins respectively. When DETECT_TRS is
HIGH, the video standard timing signals will be extracted from the embedded TRS ID
words in the parallel input data. Both 8-bit and 10-bit TRS code words will be identified
by the device.
NOTE: I/O processing must be enabled for the device to remap 8-bit TRS words to the
corresponding 10-bit value for transmission.
The GS1662 determines the video standard by timing the horizontal and vertical
reference information supplied at the H/HSYNC, V/VSYNC, and F/DE input pins, or
PCLK Rate
13.5MHz
13.5MHz
148.5 or 148.5/1.001MHz
148.5 or 148.5/1.001MHz
27MHz
27MHz
27MHz
GS1662 HD/SD-SDI Serializer with Complete SMPTE
Video Support
Data Sheet
53628 - 3
October 2010
29 of 73