AK8854VQ Datasheet, PDF (41/95 Pages) Asahi Kasei Microsystems – Multi-Format Digital Video Decoder

[AK8854VQ]
In making the above register settings, the following restrictions apply,
1. Setting both NDNTSC443(bit 4) and NDPAL60(bit 5) to [1] (High) is prohibited.
2. Setting both ND525L(bit 6) and ND625L(bit 7) to [1] (High) is prohibited.
3. To limit candidate formats, it is necessary to have the auto detection mode OFF while first
setting the register to non-limited signal status and next the NDMODE settings, and then setting
the auto detection mode to ON.
Set auto detection mode to OFF
Set Input Video Standard Register to non-limited signal status
Enter NDMODE Register Settings
Set auto detection mode to ON
7.4 Output data format
In the AK8854, the settings for the output code and the vertical blanking intervals for the output signal
are as follows.
VBIL[2:0]-bits: Settings for vertical blanking interval
VBIL[2:0]-bits 525/625 lines
Vertical blanking interval
Notes
[001]
525
625
Line1~Line20 and Line263.5~Line283.5
Line623.5~Line23 and Line311~Line336.5
+1Line
[010]
525
625
Line1~Line21 and Line263.5~Line284.5
Line623.5~Line24 and Line311~Line337.5
+2Lines
[011]
525
625
Line1~Line22 and Line263.5~Line285.5
Line623.5~Line25 and Line311~Line338.5
+3Lines
[000]
525
625
Line1~Line19 and Line263.5~Line282.5
Line623.5~Line22 and Line311~Line335.5
Default
[101]
525
625
Line1~Line16 and Line263.5~Line279.5
Line623.5~Line19 and Line311~Line332.5
-3Lines
[110]
525
625
Line1~Line17 and Line263.5~Line280.5
Line623.5~Line20 and Line311~Line333.5
-2Lines
[111]
525
625
Line1~Line18 and Line263.5~Line281.5
Line623.5~Line21 and Line311~Line334.5
-1Line
[100]
Reserved
Reserved
–
As indicated in this table, the default values are Lines 1~19 and 263.5~282.5 for 525-line signals and
Lines 623.5~22 and 311~335.5 for 625-line signals, and other specific values are set by entering the
difference from these default values.
601LIMIT-bit: Settings for output data code Min/Max
601LIMIT-bit
Output data code Min~Max
Notes
[0]
Y: 1~254
Cb, Cr: 1~254
Default
[1]
Y: 16~235
Cb, Cr: 16~240
The AK8854 data code output format (Y:Cb:Cr=4:2:2) is compliant with ITU-R BT.601.
All internal calculating operations are made with Min = 1, Max = 254.
With 601LIMIT-bit set to [1], codes 1~15 and 236~254 are respectively clipped to 16,235.
MS0973-E-01
41
2008/07