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invalid data
or
timing reference code
internal header
sliced data
and filling data
DDC_3 DDC_4 CS BC
timing reference code
invalid data
00
end of raw VBI line
00 00
00 EAV
...
...
FF 00 00 SAV SDID DC IDI1 IDI2
D
1_3
D
1_4
D
2_1
...
FF 00 00 EAV 00
MHB549
D
1_1
D
1_2
...
FF
00
ANC data output is only filled up
to the Dword boundary
ANC header
00 FF
internal header
FF DID SDID DC IDI1 IDI2
sliced data
...
D
1_3
D
1_4
... DDC_3 DDC_4 CS BC
00
00
ANC header active for DID (subaddress 5DH) <3EH
Fig.30 Sliced data formats on the I-port in 8-bit mode.
Table 19 Explanation to Fig.30
NAME
EXPLANATION
SAV
start of active data; see Table 20
SDID sliced data identification: NEP(1), EP(2), SDID5 to SDID0, freely programmable via I2C-bus subaddress 5EH, D5 to D0, e. g. to be used as
source identifier
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 = 1⁄4(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
IDI2
Dn_m
internal data identification 1: OP(3), FID (field 1 = 0, field 2 = 1), LineNumber8 to LineNumber3 = Dword 1 byte 1; see Table 20
internal data identification 2: OP(3), LineNumber2 to LineNumber0, DataType3 to DataType0 = Dword 1 byte 2; see Table 20
Dword number n, byte number m
DDC_4 last Dword byte 4, note: for SAV/EAV framing DC is fixed to 0BH, missing data bytes are filled up; the fill value is A0H
CS
the check sum byte, the checksum is accumulated from the SAV (respectively DID) byte to the DDC_4 byte
number of valid sliced bytes counted from the IDI1 byte
BC
EAV
end of active data; see Table 20
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.
NXP [ NXP ]
