TMC2072 Fairchild Semiconductor, TMC2072 Datasheet - Page 8

• Manufacturer Part Number: TMC2072
• Description: Genlocking Video Digitizer
• Manufacturer: Fairchild Semiconductor

TMC2072
Control and Status Register Bit Functions
Summary
Details
8
Reg 00
Reg 01
Reg 02
Reg 03
Reg 04
Reg 05
Reg 06
Reg 07
Reg 08
Reg 09
Reg 0A
Reg 0B
Reg 0C
Reg 0D
Reg 0E
Reg 0F
Bit
Reg 00 97h (year of revision)
Reg 01 20h (part #)
Reg 02 72h (part #)
Reg 03 01h (silicon revision #)
Reg 04 Reserved
Reg 05 Lock Flags & Sync Height
6
5
4:0
7
Register
Name
BURST_DET
BURST LOCK
HLOCK
ST
Function
97h (year of revision)
20h (part #)
72h (part #)
01h (silicon revision #)
Reserved
Lock flags; sync tip
Blank level
Reserved
Format; clock rate; freerun; clamp; reset
HSync lead/lag
Gain; loop filter bandwidth; subpixel sync & clk position
Video source select
Vsync delay
Sync tip set
Output timing, tristate
Reserved
Function
Each time a high-frequency signal is detected during a video line’s normal
expected burst interval, this flag goes high until the next line’s expected burst
period. If no high-frequency signal is present during the expected burst interval,
this flag goes low. With a standard color television signal input, this flag will be low
during vertical field groups and, in PAL, Bruch-blanked lines. [TMC22071A bit 47.]
If the subcarrier loop is unlocked on the current video line, i.e., the subcarrier
phase error measured during burst exceeds the lock threshold, this flag goes low
until the next burst interval. If the phase error is less than the threshold, the flag is
reset high. This flag is meaningful only if HLOCK is low.
During each video field, if most horizontal sync pulses arrive more than 15 pixels
before or after their expected positions, this flag will go high. If most of the field’s
incoming horizontal syncs fall within 15 pixels of their expected positions, this flag
will go low. [TMC22071A bit 56.]
These bits report the each line’s average sync tip level out of the A/D converter
(as observed over CVBS). For a clean signal, the reported value will match the
sync tip set in Reg 0D, below.
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PRODUCT SPECIFICATION
REV. 1.0.4 6/19/01
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