CS4954-CQ View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
'CS4954-CQ' PDF : 56 Pages View PDF
CS4954 CS4955
Analog
Field 1
VSYNC Drops
523 524 525 1
2
3
4
5
6
7
8
9 10
22
Analog
Field 2
261 262 263 264 265 266 267 268 269 270 271 272
284
285
Analog
Field 3
VSYNC Drops
523 524 525 1
2
3
4
5
6
7
8
9 10
22
Analog
Field 4
261 262 263 264 265 266 267 268 269 270 271 272
284
285
Burst begins with positive half-cycle
Burst begins with negative half-cycle
Figure 7. NTSC Video Interlaced Timing
pins for 240 lines beginning on active video line 22
and continuing through line 261.
Field two begins with VSYNC transitioning low at
line 266. VSYNC stays low for 3 line cycles and
transitions high during the end of line 268. Video
input on the V [7:0] pins is expected between line
284 and line 522. Field two is 263 lines; field one
is 262 lines.
5.2.9. PAL Progressive Scan
VSYNC will transition low at the beginning of the
odd field and will remain low for 2.5 lines or 2160
pixel cycles (864 × 2.5). PAL non-interlaced tim-
ing is illustrated in Figure 10. In this mode, the
CS4954/5 expects digital video input on the V [7:0]
pins for 288 lines, beginning on active video line 23
and continuing through line 309.
The second begins with VSYNC transitioning low
after 312 lines from the beginning of the first field.
VSYNC stays low for 2.5 line-times and transitions
high during the middle of line 315. Video input on
the V [7:0] pins is expected between line 335
through line 622. Field two is 313 lines; field one is
312 lines.
5.3. ITU-R.BT656
The CS4954/5 supports an additional ITU-
R.BT656 slave mode feature that is selectable
through the ITU-R.BT656 bit of the CONTROL_0
Register. The ITU-R.BT656 slave feature is unique
because the horizontal and vertical timing and dig-
ital video are combined into a single 8-bit 27 MHz
input. With ITU-R.BT656 there are no horizontal
and vertical input or output strobes, only 8-bit
27 MHz active CbYCrY data, with start- and end-
of-video codes implemented using reserved 00 and
FF code sequences within the video feed. As with
all modes, V [7:0] are sampled with the rising edge
of CLK. The CS4954/5 expects the digital ITU-
R.BT656 stream to be error-free. The FIELD out-
18
DS278PP4
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