UPD64084 NEC, UPD64084 Datasheet - Page 24

• Manufacturer Part Number: UPD64084
• Description: THREE-DIMENSIONAL Y/C SEPARATION LSI WITH ON-CHIP MEMORY
• Manufacturer: NEC

9.2
items. If all these items turn out to be normal, an ID signal is detected.
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The ID-1 decoder checks whether the video signal contains an ID-1 signal by examining mainly the following five
<1> A difference of DC level between Ref signal and the pedestal level is not smaller than a certain value.
<2> The width of each bit is not smaller than a certain value.
<3> Items <1> to <2> continue for at least 6 fields. (When FELCHK register is set to zero, this check is disable)
<4> CRC check is passed.
Remark
ID-1 Decoder
If any errors are detected in item <1> to <3>, the output for serial bus hold the decoded value for the
previous field.
If item <3> is disabled by setting FELCHK register to zero, CRC check is also disabled.
If any errors are detected by CRC check, the output for serial bus will be initialized.
Initial values of serial bus registers are WORD0 = 00, WORD1 = 1111, WORD2 = 00h.
SA04
Color
burst
MSB
1
0
WORD0
Figure 9-2. ID-1 Signal Configuration
WORD1
LSB
Data Sheet S16021EJ2V0DS
SA05
MSB
WORD2
CRC code
LSB
PD64084