cx25870 Conexant Systems, Inc., cx25870 Datasheet - Page 129

• Manufacturer Part Number: cx25870
• Description: Video Encoder With Adaptive Flicker Filtering And Hdtv Output
• Manufacturer: Conexant Systems, Inc.

CX25870/871
Flicker-Free Video Encoder with Ultrascale Technology
Table 2-5. Programming Detail For All Read/Write Registers (15 of 16)
100381B
V_ACTIVEO[8]
V_ACTIVEO[7:0]
V_BLANKI[7:0]
V_BLANKO[7:0]
V_LINESI[10]
V_LINESI[9:8]
V_LINESI[7:0]
V_SCALE[13:8]
V_SCALE[7:0]
VBLANKDLY
VSYNC_DUR
VSYNCI
VSYNWIDTH[2:0]
WSSDAT[20:1]
WSSINC[19:0]
XDSSEL[3:0]
XTL_BFO_DIS
XTAL_PAD_DIS
Bit/Register
Names
Bit 7–86 and Bits
[7:0]–84
Bits [7:0]–92
Bit 3–A2
Bit 5–30
Bits [7:0]–82
Bit 1–38,
[1:0]–96, Bits
[7:0]–90
Bits [5:0]–9A and
Bits {7:0]–98
Bit 4–8E
Bit 4–C6
Bits [2:0]–74
Bits [7:0]–64,
- 62, and
bits [3:0]–60
Bits [3:0]–6A and
bits [7:0]–68, - 66
Bits [7:4]–5E
Bit 6–30
Bit Location
Bits
Number of active output lines/field.
Number of input lines between VSYNC* leading edge and first active line.
Line number of first active output line (number of blank lines + 1).
Number of vertical input lines. This register value must match the graphic controller’s
VTOTAL register for a new overscan ratio.
Vertical scaling coefficient.
VSR = V_ACTIVEI / (ALO * (1 – VOC))
V_SCALE[13:0] = (int) ((VSR – 1) * 2
0 = Normal operation. (DEFAULT)
1 = The effective vertical blanking value in the second field is V_BLANKI+1. Commonly
used in CCIR601 input. No effect if 0.
0 = Generates 2.5 line VSYNC analog output (found in equalization and serration pulse
region). Common for most PAL and SECAM formats.
1 = Generates 3 line VSYNC analog output (found in equalization and serration pulse
region). Common for all NTSC, PAL-N, PAL-M, and PAL-60 formats. (DEFAULT)
0 = CX25870/871 transmits or receives active digital low VSYNC*. (DEFAULT)
1 = CX25870/871 transmits or receives active digital high VSYNC*.
Controls the width of the VSYNC* output pulse. Denotes the number of lines the
VSYNC* digital signal remains low on field transitions. Value will be hexadecimal and its
units are in terms of lines. A value of 0 is a disallowed condition. The acceptable range is
1 line to (2
in master interface.
Wide screen signaling (WSS) data bits. Review WSS section for more details.
WSS DTO increment bits. Review WSS section for more details.
Line position of Extended Data Services (XDS) Content.
Controls which line contains Extended Data Services data. Each line enable is
independent of the other.
0001 = Extended Data Services on line 282 (525-line) and line 333 (625-line).
0010 = Extended Data Services on line 283 (525-line) and line 334 (625-line).
0100 = Extended Data Services on line 284 (525-line) and line 335 (625-line).
(DEFAULT)
1000 = Extended Data Services on line 285 (525-line) and line 336 (625-line).
On power-up, a 50% duty cycle buffered output will be transmitted at the frequency
found between the XTALIN and XTALOUT ports from the XTL_BFO pin #3.
0 = Enable buffer crystal clock output. [DEFAULT]
1 = Disable buffer crystal clock output.
0 = Normal operation. (DEFAULT)
1 = Disable XTALIN and XTALOUT crystal pin. Encoder must receive main clock through
CLKI pin.
3
–1) lines. The default value is 1. Never set to 0. This register is only effective
Conexant
Bit/Register Definition
12
)
2.0 Internal Registers
2.4 Reading Registers
2-23