cx25870 Conexant Systems, Inc., cx25870 Datasheet - Page 125

• 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 (11 of 16)
100381B
HSYNCI
HSYNOFFSET[9:8]
HSYNOFFSET[7:0]
HSYNWIDTH[5:0]
HUE_ADJ[7:0]
IN_MODE[3] and
IN_MODE[2:0]
LUMADLY[1:0]
MCB[7:0]
MCOMPU[7:0]
MCOMPV[7:0]
MCOMPY[7:0]
MCR[7:0]
Bit/Register
Names
Bits [7:6]–70 and
bits [7:0]–6E
Bits [5:0]–70
Bits [7:0]–5C
Bit 3–32 and bits
[2:0]–C6
Bits [1:0]–D6
Bits [7:0]–AA
Bits [7:0]–3E
Bits [7:0]–40
Bits [7:0]–3C
Bits [7:0]–A8
Bit 3–C6
Bit Location
0 = Configures the encoder to send/receive an active low HSYNC* digital signal
(DEFAULT)
1 = Configures the encoder to send/receive an active high HSYNC* digital signal.
A 2s-complement number. The values range from –512 pixels to +511 pixels. This
register manipulates the falling edge position of the digital HSYNC* output from the
CX25870/871. The default value is 0 and denotes the standard position of the HSYNC*
leading edge. This register is only effective in master interface.
Controls the duration/width of the digital HSYNC output pulse. Value will be hexadecimal
and its units are in terms of pixels. A value of 0 is a disallowed condition. The acceptable
range is 0x02 pixels to 0x3F pixels (=63 decimal). The default value is 0x02. Never set to
0. This register is only effective in master interface.
Adjust the color subcarrier phase during the video active region. Increasing this value by
1 unit has the effect of increasing the phase by (360/256) = 1.406 degrees.
This bit is used in conjunction with IN_MODE[2:0] to configure the encoder to receive a
desired input pixel format. Format of input pixels when IN_MODE[3] = 0 (MSb of this
4-bit sequence):
0000 = 24-bit RGB multiplexed
0001 = 16-bit RGB multiplexed
0010 = 15-bit RGB multiplexed
0011 = 24-bit RGB nonmultiplexed
0100 = 24-bit YCrCb multiplexed
0101 = 16-bit YCrCb multiplexed
0110 = Alternate 16-bit YCrCb multiplexed
0111 = 24-bit YCrCb nonmultiplexed
Format of input pixels when IN_MODE[3] = 1(MSb of this 4-bit sequence):
1000 = Alternate 24-bit RGB multiplexed
1001 = Reserved
1010 = Alternate 16-bit RGB nonmultiplexed
1011 = Alternate 24-bit RGB nonmultiplexed
1100 = Alternate 24-bit YCrCb multiplexed
1101 = Reserved
1110 = Alternate 16-bit YCrCb nonmultiplexed
1111 = Alternate 24-bit YCrCb nonmultiplexed
Used to program the luminance delay in pixels for the CVBS_DLY and Y_DLY output
modes.
00 = No delay (DEFAULT)
01 = 1 pixel
10 = 2 pixels
11 = 3 pixels
Multiplication factor for Cb (or B-Y) component prior to subcarrier modulation.
Multiplication factor for component video U output.
Value 0x80 (DEFAULT) represents 1.0 scale factor.
Multiplication factor for component video V output.
Value 0x80 (DEFAULT) represents 1.0 scale factor.
Multiplication factor for component video Y output.
Value 0x80 (DEFAULT) represents 1.0. scale factor.
Multiplication factor for Cr (or R-Y) component prior to subcarrier modulation.
Conexant
Bit/Register Definition
2.0 Internal Registers
2.4 Reading Registers
2-19