Tektronix 1910 - Page 40

Specification-1910 Operators
TIMING REFERENCE SIGNAL
....-.,.1
II
II
II
0 110 bitsl------+I_---WORD 1 19 bitsl ::I WORD 219 b;t51 I
I,
BIT # -I 0 I 12I 3 I • I 5 I 6 I 7 18 19 I 0 I' I2 I 3 I • I 5 16 I 7 I 8 10 I 1 I 2 ! 3 1• is! 6 I 7 I 8 I
This signal occurs once every 63.56 /lS. Field and Frame information change at line number 1:'
Bit 1 of Word 0 occurs 91 Clock cycles after the nominal 50% point of the leading edge of the Horizontal
Sync pulse.
WORD 0
Bit 0 - Always High.
Bits 1
through 9 are always Low.
WORD 1
Bit 0- Always High.
Bit 1-
High for Color Frame B"
Bit 2-
High for Fields 2 and 4"
Bit 3-
2' (MSB))
Bit 4- 2' Horizontal Line Count"
Bit 5- 1" (straight binary sequence)
Bit 6- 2'
Bit7- Z
Bit 8- Odd Parity for Word 1.
(Odd parity gives the word, including parity.
an
odd number of high states.)
WORD 2
Bit 0- Always High
Bit 1- 2
3
}
Bit 2- 2' Horizontal Line Count"
Bit 3- 2' (straight binary sequence)
Bit 4- 2° (LSB)
Bit 5-
High when the preceding Frame. Field or Line Count is invalid.
Bit 6- High for lines with Color Burst.
Bit 7- High when reference subcarrier is positive-going.--
Bit 8- Odd Parity for Word 2.
(Odd parity gives the word. including parity.
an
odd number of high states.)
The remaining time of the Timing Reference Signal is High.
'The clocks repetition rate (folk) is equivalent to 1/14.31818 MHz.
"As defined in the EIA Tentative Standard AS 170A for Color Television Studio Picture Line Amplifier
Output.
3443·37B
Fig. 1-9. Timing Reference Signal Details.
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