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CX25870 Datasheet

  • CX25870

  • Conexant Systems, Inc [Video Encoder with Adaptive Flicker ...

  • 3791.05KB

  • CONEXANT   CONEXANT

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CX25870/871
Flicker-Free Video Encoder with Ultrascale Technology
1.0 Functional Description
1.3 Device Description
Table 1-21. Register Values for 640x480 / 800x600 / 1024x768 RGB In, SECAM-L Out (4 of 4)
640x480 RGB in,
SECAM-L out
HOC = 16.55%,
VOC = 16.66%
Register Address
0xCA
0xCC
0xCE
(4)
0xD0
0xD2
0xD4
0xD6
0xD8
NOTE(S):
800x600 RGB in, SECAM-L
out HOC = 14.52%
VOC=13.19%
1024x768 RGB in,
SECAM-L out
HOC = 12.72%
VOC = 12.15%
CX25870 Register Values
C0
C0
24
0
0
0
0
40
CX25870 Register
Values
C0
C0
24
00
00
00
00
40
CX25870 Register Values
C0
C0
24
0
0
0
0
40
1. Register 0x6C contains the TIMING_RESET bit. Set this bit as your last programming step and the CX25870 will clear it
automatically later.
2. Register 0xC4 contains the EN_OUT bit. Adjust according to your design's interface as necessary.
3. Register 0xC6 contains the EN_BLANKO, EN_DOT, and IN_MODE[2:0] bits. Adjust according to your design's interface as
necessary.
4. Register 0xCE contains the OUT_MUXD[1:0], OUTMUXC[1:0], OUTMUXB[1:0], and OUTMUXA[1:0] bit fields for output
routing. Adjust according to your design's interface as necessary.
5. This is a SECAM specific register.
The procedure required to obtain a SECAM output with an overscan
compensation percentage that differs from those solutions in
Table 1-21
is fairly
simple. First, configure the encoder so it generates a standard PAL-B output with
the desired overscan compensation percentage. This can be done through the use
of an autoconfiguration mode, a hand-generated, or a predefined register set.
Second, perform a full register read-back from the CX25870. Carefully note the
value for register 0xA2. Third, program only the bits found in
Table 1-22
to their
new state within the CX25870.
Table 1-22. Vital SECAM Bit Settings鈥揜egister 0xA2
Bit Name
FM
PAL_MD
VSYNC_DUR
Location
Bit 7 of register 0xA2
Bit 5 of register 0xA2
Bit 3 of register 0xA2
0
1
0
State for PAL-BDGHI
1
0
0
State for SECAM
100381B
Conexant
1-73

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