2000
Mar
15
56
Philips
Semiconductors
Preliminar
y
specication
P
AL/NTSC/SECAM
video
decoder
with
adaptiv
e
P
AL/NTSC
comb
lter
,VBI-data
slicer
and
high
perf
or
mance
scaler
SAA7114H
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Table 19 Explanation to Fig.30
Notes
1. Inverted EP (bit 7); for EP see note 2.
2. Even parity (bit 6) of bits 5 to 0.
3. Odd parity (bit 7) of bits 6 to 0.
NAME
EXPLANATION
SAV
start of active data; see Table 20
SDID
sliced data identication: NEP(1), EP(2), SDID5 to SDID0, freely programmable via I2C-bus subaddress 5EH, D5 to D0, e. g. to be used as
source identier
DC
Dword count: NEP(1), EP(2), DC5 to DC0. DC describes the number of succeeding 32-bit words:
For SAV/EAV mode DC is fixed to 11 Dwords (byte value 4BH)
For ANC mode it is: DC = 14(C + n), where C = 2 (the two data identification bytes IDI1 and IDI2) and n = number of decoded bytes
according to the chosen text standard.
Note that the number of valid bytes inside the stream can be seen in the BC byte.
IDI1
internal data identication 1: OP(3), FID (eld 1 = 0, eld 2 = 1), LineNumber8 to LineNumber3 = Dword 1 byte 1; see Table 20
IDI2
internal data identication 2: OP(3), LineNumber2 to LineNumber0, DataType3 to DataType0 = Dword 1 byte 2; see Table 20
Dn_m
Dword number n, byte number m
DDC_4
last Dword byte 4, note: for SAV/EAV framing DC is xed to 0BH, missing data bytes are lled up; the ll value is A0H
CS
the check sum byte, the checksum is accumulated from the SAV (respectively DID) byte to the DDC_4 byte
BC
number of valid sliced bytes counted from the IDI1 byte
EAV
end of active data; see Table 20
MHB549
00
FF
00
SAV SDID DC
IDI1
IDI2 D1_3 D1_4 D2_1
DDC_3 DDC_4 CS
BC
FF
00
EAV
00
...
D1_2
D1_1
...
FF
00
EAV
00
FF
DID SDID DC
IDI1
IDI2 D1_3 D1_4
DDC_3 DDC_4 CS
BC
00
...
ANC header
internal header
sliced data
ANC data output is only filled up
to the Dword boundary
timing reference code
invalid data
or
end of raw VBI line
timing reference code
internal header
sliced data
invalid data
and filling data
Fig.30 Sliced data formats on the I-port in 8-bit mode.
ANC header active for DID (subaddress 5DH) <3EH