GS4910B GENNUM [Gennum Corporation], GS4910B Datasheet - Page 85

• Manufacturer Part Number: GS4910B
• Description: HD/SD/Graphics Clock and Timing Generator with GENLOCK
• Manufacturer: GENNUM [Gennum Corporation]

Table 3-13: Configuration and Status Registers (Continued)
Register Name
Clock_Phase_Offset
Max_Ref_Delta
Video_Status
Address
1Dh
1Eh
1Fh
1Fh
1Fh
1Fh
1Fh
1Fh
36655 - 2
Bit
15-0
15-0
15-5
4
3
2
1
0
April 2006
The value programmed in this register controls the
Description
Phase_Offset - The output clock and data phase may
be offset with respect to the input reference by the
number of increments programmed in this register. The
increment step size depends on the video clock
frequency.
The encoding scheme for this register is shown in
Table
NOTE: This register must be cleared to achieve a clock
phase offset of zero.
Reference:
allowed deviance from the expected frequency on the
reference HSYNC before the internal video PLL loses
lock. The encoding scheme is shown in
Reference:
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:
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:
Ref_Blank_Timing - status register to indicate the input
detection of H blanking vs. H sync timing (‘1’ for
blanking, '0' for sync timing).
This bit will be zero when no reference signal is present.
Reference:
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.
3-1.
Section 3.2.1.1 on page 37
Section 3.5.4 on page 49
Section 3.4.3 on page 45
Section 3.4.3 on page 45
Section 3.4.3 on page 45
GS4911B/GS4910B Data Sheet
Table
3-3.
R/W
R/W
R/W
–
R
R
R
R
R
Default
0
000Bh
–
N/A
N/A
N/A
N/A
N/A
85 of 113