lc74793 Sanyo Semiconductor Corporation, lc74793 Datasheet - Page 12

• Manufacturer Part Number: lc74793
• Description: Vps/pdc Slicer Ic
• Manufacturer: Sanyo Semiconductor Corporation

Command 4 (Synchronizing signal detection command 2)
• First byte
• Second byte
Note: All registers are cleared to 0 when the IC is reset by the RST pin.
DA 0 to 7
DA 0 to 7
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
Register
Register
SJNS3
SJNS1
SJNS1
SJCS1
SJCS0
RNE0
—
—
—
—
—
—
—
—
—
—
Status
Status
1
1
1
1
0
1
0
0
0
0
0
1
0
1
0
1
0
1
0
1
0
1
First byte identification bit
Command 4 identification code.
Synchronizing signal detection settings 2.
Second byte identification bit
Synchronization signal discrimination absent
Synchronization signal discrimination absent
SJNS3
SJCS1
0
0
0
0
1
1
1
1
0
0
1
SJNS2
SJCS0
0
0
1
1
0
0
1
1
0
1
0
LC74793, 74793JM
Contents
Contents
SJNS1
0
1
0
1
0
1
0
1
677 ns (1/3)
903 ns (1/4)
450 ns (1/2)
Function
Function
PAL
preset: Values in parentheses
preset: Normal values
Count
None
128
256
16
32
64
4
8
1117 ns (1/4)
448 ns (1/2)
838 ns (1/3)
NTSC
Changes the values used for
synchronizing signal discrimination in
the absent
Setting for the noise exclusion circuit
used for synchronizing signal
discrimination in the absent
direction.
If the number of H signal inputs during
a 1H period is greater than or equal to
the value listed in the table, the IC
determines that the signal is absent.
Synchronization discrimination.
HSYNI signal switching clock
selection.
preset direction (COM3).
Notes
Notes
No. 5966-12/24
preset