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MTV212MV64U View Datasheet(PDF) - Myson Century Inc

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MTV212MV64U
Myson
Myson Century Inc Myson
MTV212MV64U Datasheet PDF : 27 Pages
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MYSON
TECHNOLOGY
MTV212M64
(Rev. 1.2)
VSYNC
HSYNC
Digital Filter
Present
Check
Vpre
Polarity Check &
Freq. Count
Vfreq
Vpol
Vbpl
CVSYNC
XOR
Vself
Present
Check
CVpre
XOR VBLANK
Digital Filter
Polarity Check &
Sync Seperator
Hpol
Present Check &
Freq. Count
Hpre
Hfreq
Composite
Pulse Insert
XOR
Hself
Hbpl
XOR HBLANK
H/V SYNC Processor Block Diagram
6.1 Composite SYNC separation/insertion
The MTV212M continuously monitors the input HSYNC, if the vertical SYNC pulse can be extracted from the
input, a CVpre flag is set and user can select the extracted "CVSYNC" for the source of polarity check,
frequency count, and VBLANK output. The CVSYNC will have 8us delay compared to the original signal.
The MTV212M can also insert pulse to HBLANK output during composite VSYNC’s active time. The insert
pulse’s width is 1/8 HSYNC period and the insertion frequency can adapt to original HSYNC.
6.2 H/V Frequency Counter
MTV212M can discriminate HSYNC/VSYNC frequency and saves the information in XFRs. The 14 bits
Hcounter counts the time of 64xHSYNC period, then load the result into the HCNTH/HCNTL latch. The
output value will be [(128000000/H-Freq) - 1], updated once per VSYNC/CVSYNC period when
VSYNC/CVSYNC is present or continuously updated when VSYNC/CVSYNC is non-present. The 12 bits
Vcounter counts the time between two VSYNC pulses, then load the result into the VCNTH/VCNTL latch.
The output value will be (62500/V-Freq), updated every VSYNC/CVSYNC period. An extra overflow bit
indicates the condition of H/V counter overflow. The VFchg/HFchg interrupt is set when VCNT/HCNT value
changes or overflow. Table 4.2.1 and table 4.2.2 shows the HCNT/VCNT value under the operations of
12MHz.
Revision 1.2
- 9-
2000/07/04
 

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