GS1500

Features:

• SMPTE 292M compliant
• standards detection/indication for SMPTE 292M levels
A/B,C,D/E,F,G/H,I,J/K,L/M
• NRZI decoding and SMPTE descrambling with BYPASS option
• line CRC calculation, comparison
• selectable line based CRC re-insertion
• H, V, F timing reference signal (TRS) extraction
• selectable flywheel for noise immune H, V, F extraction
• selectable automatic switch line handling
• selectable TRS and line number re-insertion
• selectable active picture illegal code re-mapping
• ANC data position indication
• ANC data extraction via internal FIFOs
(1024 bytes on Y and C channels)
• configurable FIFO LOAD pulse
• 20 bit 3.3V CMOS input data bus
• optimized input interface to GS1545 or GS1540
• single +3.3V power supply
• 5V tolerant I/O




Application

SMPTE 292M Serial Digital Interfaces




Specifications

PARAMETER	VALUE
Supply Voltage	-0.5V to +4.6V
Input Voltage Range (any input)	-0.5V < VIN < 5.5V
Operating Temperature Range	0°C TA 70°C
Storage Temperature Range	-40°C TS 125°C
Lead Temperature (soldering, 10 sec)	260°C

Description

When interfaced to the Gennum GS1545 HDTV Equalizing Receiver or GS1540 Non-Equalizing Receiver, the GS1500 performs the final conversion to word aligned data. The GS1500 performs NRZI decoding and de-scrambling as per SMPTE 292M and word-aligns to the incoming data stream. Line based CRCs are calculated on the incoming data stream and are compared against the CRCs embedded within the data stream.

HVF timing information is extracted from the data stream. A selectable internal HVF flywheel provides superior noise immunity against TRS signal errors. The GS1500 also detects and indicates the input video signal standard.

The GS1500 can detect and re-map illegal code words contained within the active portion of the video signal. The positions of the embedded ANC data are indicated and the ANC data may be extracted and accessed by the user through an internal FIFO interface. Prior to exiting the GS1500, TRS, Line Numbers and CRCs based on internal calculations may be re-inserted into the data stream.