GS4911B Datasheet, PDF (20/113 Pages) Gennum Corporation – HD/SD/Graphics Clock and Timing Generator with GENLOCK

GS4911B/GS4910B Data Sheet
1.4 Pre-Programmed Recognized Video and Graphics Standards
Table 1-2 describes the video and graphics standards automatically recognized by
the GS4911B/GS4910B. Any one of the 36 different video formats and 16 different
graphic display formats listed below can be applied to the GS4911B/GS4910B and
automatically detected by the reference format detector. Moreover, each format,
with the exception of VID_STD[5:0] = 2, 52, 53, or 54, is available for output on the
timing output pins by setting the VID_STD[5:0] pins.
In addition to the pre-programmed video standards listed in Table 1-2, custom
output timing signals may be generated by the GS4911B/GS4910B. The custom
timing parameters are programmed in the host interface when VID_STD[5:0] is set
to 62 (see Section 3.10 on page 74).
Setting VID_STD[5:0] to 63 will cause the device to produce an output format with
identical timing to the detected input reference.
If desired, the external VID_STD[5:0] pins may be ignored by setting bit 1 of the
Video_Control register, and the video standard may instead be selected via the
VID_STD[5:0] register of the host interface (see Section 3.12.3 on page 79).
Although the external VID_STD[5:0] pins will be ignored in this case, they should
not be left floating.
36655 - 2 April 2006
20 of 113