參數(shù)資料
型號(hào)： TMC2491A
廠商： Fairchild Semiconductor Corporation
英文描述： Multistandard Digital Video Encoder(多標(biāo)準(zhǔn)數(shù)字視頻編碼器)
中文描述： 多標(biāo)準(zhǔn)數(shù)字視頻編碼器（多標(biāo)準(zhǔn)數(shù)字視頻編碼器）
文件頁(yè)數(shù)： 6/36頁(yè)
文件大?。?/td> 208K
代理商： TMC2491A
TMC2490A/TMC2491A
PRODUCT SPECIFICATION
6
Table 2. Default Register Values on Reset
Control Register Definitions
Reg
00
01
02
03
Dflt
97
24
90(91)
xx
Reg
04
05
06
07
Dflt
00
01
00
00
Reg
08
09
0A
0B
Dflt
00
00
00
00
Reg
0C
0D
0E
0F
Dflt
00
00
00
F2
Reg
20
21
22
Dflt
80
80
00
Reg
00
01
02
03
Bit
7–0
7–0
7–0
7–0
Name
PARTID2
PARTID1
PARTID0
REVID
Description
Reads back 97h
Reads back 24h
Reads back 90h (91h)
Reads back a value corresponding to the revision letter of the silicon.
Global Control Register (04)
7
6
5
4
3
2
1
0
MASTER
NGSEL
YCDELAY
RAMPEN
YCDIS
COMPDIS
FORMAT
Reg
04
Bit
7
Name
MASTER
Description
Master Mode.
When MASTER = 1, the encoder generates its own video
timing and outputs signals VSYNC (or T/B), HSYNC, SELC, and PDC (or
CBSEL). When MASTER = 0, the TMC2490(1)A extracts timing from the
embedded EAV codeword in the video datastream and optionally outputs
signals VSYNC (or T/B), HSYNC, SELC, and PDC (or CBSEL).
NTSC Gain Selection.
Luma to chroma delay.
When HIGH, the luminance path within the
TMC2490(1)A is delayed by one PXCK period. The delay applies to both
COMPOSITE and LUMA outputs and may be used to compensate for group
delay variation of external filters. When LOW, luminance and chrominance
have the same latency.
Modulated ramp enable.
When HIGH, the TMC2490(1)A outputs a
modulated ramp test signal. When LOW, incoming digital video is encoded.
LUMA, CHROMA disable.
When HIGH, the LUMA and CHROMA outputs
are disabled. Set LOW for normal enabled operation.
COMPOSITE disable.
When HIGH, the COMPOSITE output is disabled.
Set LOW for normal enabled operation.
Television standard select.
Selects basic H&V timing parameters and
subcarrier frequency. Pedestal level and chrominance bandwidth are
independently programmed.
04
04
6
5
NGSEL
YCDELAY
04
4
RAMPEN
04
3
YCDIS
04
2
COMPDIS
04
1–0
FORMAT
0 0 NTSC
0 1 PAL-B,G,H,I,N
1 0 PAL-M
1 1 Reserved
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