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Filename:
SAA7115_Datasheet.fm
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page 74
Last edited by H. Lambers
Philips Semiconductors
CS-PD Hamburg
CVIP2
Datasheet
SAA7115
Date:
10/23/01
Version:
0.67
For INS80 =’1’ the behaviour changes and inside the scalers output line (scaler H-gate on IGPH = ‘1’), the data are hold
during IDQ =’0’. Outside the scalers output, in the remaining horizontal blanking interval, blanking values are inserted.
As a further option, it is possible to provide the scaler with an external gating signal on pin ITRDY. Thereby making it
possible to hold the data output for a certain time and to get valid output data in bursts of a guaranteed length.
The sketched reference signals and events can be mapped to the I-port output pins IDQ, IGPH, IGPV, IGP0 and IGP1.
For flexible use the polarities of all the outputs can be modified. The default polarity for the qualifier and reference signals
is logic 1 (active).
Table 24 shows the relevant and supported SAV and EAV coding, the figures 34, 33, 35, 36 show some basic pulse
diagrams.
Table 24
SAV/EAV codes on I-port
Notes
1.
2.
The leading byte sequence is: FFH-00H-00H.
The MSB of the SAV/EAV code byte is controlled by:
a) Scaler output data: task A
MSB = CONLH[90H[7]]; task B
MSB = CONLH[C0H[7]].
b) VBI-data slicer output data: SLDOM[2] = ‘1’
MSB = 1; SLDOM[2] = ‘0’
MSB = 0.
EVENT DESCRIPTION
SAV/EAV CODES ON I-PORT
(1)
(HEX)
COMMENT
MSB
(2)
OF SAV/EAV
BYTE = 0
MSB
(2)
OF SAV/EAV
BYTE = 1
FIELD ID = 0
FIELD ID = 1
FIELD ID = 0
FIELD ID = 1
Next pixel is FIRST pixel of any
active line
Previous pixel was LAST pixel of
any active line, but not the last
Next pixel is FIRST pixel of any
V-blanking line
Previous pixel was LAST pixel of
the last active line or of any
V-blanking line
No valid data, don’t capture and
don’t increment pointer
0E
49
80
C7
HREF = active;
VREF = active
HREF = inactive;
VREF = active
HREF = active;
VREF = inactive
HREF = inactive;
VREF = inactive
13
54
9D
DA
25
62
AB
EC
38
7F
B6
F1
00 (only for INS80 = ‘0’)
IDQ pin inactive