VPX 322xE
ADVANCE INFORMATION
Table 2–4 shows the coding of the ancillary header in-
formation. The word I[2:0] contains a value for data type
identification (1 for sliced and 3 for raw data during odd
fields, 5 for sliced and 7 for raw data during even fields).
M[5:0] contains the MSBs and L[5:0] the LSBs of the
number of following D–words (32 for sliced data, 285 for
raw data). DC1 is normally used as secondary data ID.
The value 0 for M[5:0] in the case of sliced data marks
an undefined format. Bit[6](P) is even parity for bit[5] to
bit[0]. Bit[7] is the inverted parity flag. Note that the fol-
lowing user data words (video data) are either limited or
have odd parity to assure that 0 and 255 will not occur.
Bit[3] in FP-RAM 0x150 selects between these two op-
tions.
Table 2–4: Coding of the ancillary header information
Bit No.
Word
MSB
7
LSB
0
6
0
5
4
3
2
1
Pream1
Pream2
Pream3
DID
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
NP
NP
NP
P
P
P
0
1
0
I2
M2
L2
I1
M1
L1
I0
M0
L0
DC1
M5
L5
M4
L4
M3
L3
DC2
current line length
dependent on window size
C Y C Y ...
Digital
Video Output
C Y C Y ...
b
r
b
r
constant during
horizontal blanking
SAV: “start of active video” header
EAV: “end of active video” header
Y = 10 ; C = C = 80
hex
r
b
hex
VACT
Fig. 2–19: Output of video or VBI data with embedded reference headers (according to ITU-R656)
DATA
(Port A)
80h
10h
SAV
SAV
SAV
SAV
C
Y
C
Y
C
Y
C
Y
EAV
EAV
EAV
EAV
4
80h
10h
1
2
3
4
b1
1
r1
2
bn–1
n–1
rn–1
n
1
2
3
VACT
PIXCLK
LLC
Fig. 2–20: Detailed data output (double clock mode)
current line length
size of programmable VACT
dependent on VBI-window size
Digital
Video Output
D D D D ...
C Y C Y ...
b r
1
2
3
4
constant during
horizontal blanking
SAV: “start of active video” header
EAV: “end of active video” header
Y = 10 ; C = C = 80
hex
r
b
hex
VACT
Fig. 2–21: Output of VBI-data as ancillary data
20
MICRONAS INTERMETALL
MICRONAS [ MICRONAS ]
