GS4911B_09 Datasheet, PDF(88/119 Page) Gennum Corporation – HD/SD/Graphics Clock and Timing Generator with GENLOCK

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

GS4911B_09 Datasheet, PDF (88/119 Pages) Gennum Corporation – HD/SD/Graphics Clock and Timing Generator with GENLOCK

◁

Table 3-13: Configuration and Status Registers (Continued)

Video_Status

Address

1Fh

21h-20h

Bit

15-5

31-0

Description

R/W

Reserved.

Ref_H_Polarity - status register to indicate the

detected H Sync polarity ('1' for positive, '0' for

negative).

This bit will be zero when no reference signal is

present.

Reference: Section 3.4.3 on page 45

Ref_V_Polarity - status register to indicate the

detected V Sync polarity ('1' for positive, '0' for

negative).

This bit will be zero when no reference signal is

present and for digital blanking input references.

Reference: Section 3.4.3 on page 45

Ref_Blank_Timing - status register to indicate the

input detection of H blanking vs. H sync timing (â1â

for blanking, '0' for sync timing).

This bit will be zero when no reference signal is

present.

Reference: Section 3.4.3 on page 45

A_pll_Lock (GS4911B only)- this bit will be HIGH

when the generated audio clock is locked to the

video clock reference.

NOTE: This bit will remain high in the GS4910B.

Reference: bit 1 of register 15h.

V_pll_Lock - this bit will be HIGH when the

generated video clock is locked to the H Sync input

reference.

Reference: bit 1 of register 15h.

A non-zero number programmed in this register

R/W

defines the numerator for the ratio of the video

clock to the 27MHz reference.

This register can be used for creating custom video

clock frequencies.

NOTE: Once this register is programmed, it must be

updated using bit 6 of register 16h.

The default value of this register will vary

depending on the output video standard selected.

Address 20h = bits 15-0

Address 21h = bits 31-16

Reference: Section 3.9.1 on page 72

Default

N/A

GS4911B/GS4910B HD/SD/Graphics Clock and Timing

Generator with GENLOCK

Data Sheet

36655 - 5

June 2009

88 of 119

▷