AK8850 Datasheet, PDF (87/99 Pages) Asahi Kasei Microsystems – NTSC Digital Video Decoder

ASAHI KASEI
[AK8850]
STATUS 1 REGISTER ( R ) [ SUB ADDRESS 0x20 ]
This register shows the internal status of the AK8850.
Sub Address 0x20
bit 7
bit 6
COLKIL
FIELD
bit 5
SCLKMODE1
bit 4
SCLKMODE0
bit 3
VSQLY
bit 2
FRMSTD
bit 1
VLOCK
bit 0
NOSIG
Status 1 Register Definition
BIT Register Name
R/W Definition
No signal indicates
bit 0
NOSIG
No Signal Indicates bit
R
This data also output from NSIG pin.
0 : Signal is input
1 : No signal is input
Shows synchronization states of the input
bit 1
VLOCK
Vsync Lock Indicates bit
R
signal.
0 : Unsynchronaized to the input signal.
1 : Synchronaized to the input signal.
Showing the Input video signal quality.
bit 2 FRMSTD Frame Standard Indicates bit
R 0 : Not 525/625 interlace video signal.
1 : 525/625 is interlace video signal.
Showing the input video signal quality.
This bit reflects the SCH status.
For component video signal input, this bit
bit 3
NSTD
Non Standard Signal Indicates _R depends on FRMSTD-bit. (This bit becomes 0 at
bit
FRMSTD-bit is 1)
The data of this bit is also output from NSTD pin
0 : Standard signal is input.
1 : Non-standard signal is input.
Showing the clock-mode.
bit 4 _SCLKMODE0
Status Current Clock mode bit
bit 5
SCLKMODE1
[ CLKMODE1:CLKMODE0 ] =
00 : Working with Fixed clock mode.
R 01 : Working with Line-Locked Clock mode
10 : Reserved
11 : Working with Frame-Locked Clock mode
Showing the Field status
bit 6
FIELD
Field Status bit
0 : ODD Field
1 : EVEN Field
Showing the Color Killer Status
bit 7
COLKIL
Color Killer Active bit
R 0 : Color Killer is not active
1 : Color Killer is active
Rev.0
87
2003/01