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PRODUCT SPECIFICATION
RC6100
3
VRESET pulse for RS170 Field 1 (the odd field) and toggles
to logic high at the same time in the next field (see Figure 3).
CLOCKDIV2 is the half-frequency pixel clock output; it is a
50-percent duty-cycle waveform. The Selection Codes of
Table 1 (NTSC/PAL, S0, and S1) are input to the RC6100 to
select the desired clock frequency to be output. The divisors
shown in Table 1 indicate on-half the number of pixel clocks
in each horizontal line. The pixel clock generator circuit
(Figure 5) is formed by the Phase Detector, Charge Pump,
external Loop Filter, and the VCO. The loop filter requires
only a simple RC lag-lead network. When the PLL is locked,
the VCO provides a pixel clock that is equal to 2*N*f
times the horizontal scan frequency where N is the frequency
divisor value). CLKOUT is normally connected to CLKIN,
the clock input of the timing generator function. Note that a
half-frequency pixel clock (CLKDIV2) is also generated.
Both pixel clock outputs are 50-percent duty-cycle wave-
forms.
H
, (two
Figure 2. CLAMP Output Timing
65-6100-03
HORIZONTAL
INTERVAL
3
μ
S < t
CLAMP
< 4.3
μ
S
CSYNC
OUTPUT
CLAMP
OUTPUT
CHROMA
REFERENCE
BURST
HOR SYNC
PULSE
INTERVAL
HOR SYNC
BACK
PORCH
FRONT
PORCH
ACTIVE
VIDEO
CVIN
Definitions:
UVV: active video
UVE: half-line video, half-line equalization pulse
EE: equalization pulse
EB: equalization broad pulse
SS: vertical sync pulse with serrations
ES: half-line equalization pulse, half-line vertical sync pulse
SE: half-line vertical sync pulse, half-line equalization pulse
UBV: half-line black, half-line video
UBB: black burst
Figure 3. VRESET Output TIming
65-6100-04
524
UVV
UVV
EE
EE
EE
SS
SS
SS
SS
EE
EE
UBB
UBB
UBB
UVV
UVV
22
21
20
19
10
9
8
7
3H
POST-EQUALIZATION
7
7
4
3
2
1
525
PRE-EQUALIZATION
3H
FIELDS 1 AND 3
VERTICAL BLANKING INTERVAL
VERTICAL SYNC INTERVAL
3H
SERRATIONS
VRESET
CSYNC
VRESET
CSYNC
UVV
UVV
UBV
UVV
UVE
EE
EE
ES
SS
SS
SE
EE
EE
EB
UBB
UBB
285
284
283
262
263
FIELDS 2 AND 4
264
265
266
267
268
269
270
271
272
273
282
FIELDID
FIELDID
CVIN
CVIN