HMP8117CN Intersil Corporation, HMP8117CN Datasheet - Page 10

• Manufacturer Part Number: HMP8117CN
• Description: NTSC/PAL Video Decoder
• Manufacturer: Intersil Corporation

BLANK and DVALID Timing
DVALID is asserted when P15-P0 contain valid data. The
behavior of the DVALID output is determined by bit 4
(DVLD_LTC) and bit 5 (DLVD_DCYC) of the GENLOCK
CONTROL register 04
The BLANK output pin is used to distinguish the blanking
interval period from active video data. The blanking intervals
are programmable in both horizontal and vertical
dimensions. Reference Figure 7 for active video timing and
use Table 3 for typical blanking programming values.
During active scan lines, BLANK is asserted when the
horizontal pixel count matches the value in the START
H_BLANK register 31
NTSC(M) LINE#
PAL(M) LINE#
HSYNC
VSYNC
HSYNC
VSYNC
VIDEO
INPUT
LINE #
FIELD
LINE #
VIDEO
INPUT
FIELD
HSYNC
VSYNC
VIDEO
INPUT
FIELD
621
309
259
262
H
H
/30
for each video output mode.
H
622
310
. The pixel counter is 000
10
260
263
‘EVEN’ FIELD
‘ODD’ FIELD
311
623
‘ODD’ FIELD
261
264
FIGURE 6. PAL(B, D, G, H, I, N, N
FIGURE 5. PAL(B, D, G, H, I, N, N
FIGURE 4. NTSC(M) AND PAL(M) EVEN FIELD TIMING
312
624
265
262
H
at the
313
625
263
266
HMP8117
314
1
264
267
‘ODD’ FIELD
leading edge of the sync tip after a fixed pipeline delay. Since
blanking normally occurs on the front porch, (prior to count
000H) the START H_BLANK count must be programmed
with a large value from the previous line. Refer to the Last
Pixel Count from Table 3. BLANK is negated when the
horizontal pixel count matches the value in the END
H_BLANK register 32
programmable with two pixel resolution.
START V_BLANK register 34
register 35
field. During inactive scan lines, BLANK is asserted during the
entire scan line. Half-line blanking of the output video cannot
be done.
‘EVEN’ FIELD
C
C
) EVEN FIELD TIMING
‘EVEN’ FIELD
) ODD FIELD TIMING
315
2
265
268
H
316
determine which scan lines are blanked for each
3
266
269
317
H
4
267
270
. Note that horizontally, BLANK is
H
318
/33
5
268
271
H
and END V_BLANK
319
6
269
272
320
7
270
273