HMP8116 Datasheet, PDF (10/43 Pages) Intersil Corporation – NTSC/PAL Video Decoder

HMP8116
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VIDEO
INPUT
HSYNC
VSYNC
FIELD
‘ODD’ FIELD
‘EVEN’ FIELD
NOTE:
6. The trailing edge of VSYNC is 5±1 clocks after the leading edge of HSYNC to be VMI compatible and to indicate a transition to an even field.
FIGURE 7. PAL(B,D,G,H,I,N,N_C) HSYNC, VSYNC AND FIELD TIMING DURING AN ODD TO EVEN FIELD TRANSITION
BLANK AND DVALID TIMING
DVALID is asserted when P15-P0 contain valid data. The
timing and behavior of DVALID is dependent on the output
video format and the programmed values for bit 4
(DVLD_DCYC) and bit 5 (DVLD_LTC) of the GENLOCK
CONTROL register 04_H. Refer to the specific output video
format sections that follow for the specific behavior for
DVALID.
BLANK is used to determine if the HMP8116 is generating
active video data. BLANK should be used in conjunction with
DVALID to capture digital data from the decoder. BLANK,
DVALID and the video data are output after the internal pipe-
line latency and synchronous with the rising edge of CLK2.
During active scan lines BLANK is negated when the hori-
zontal pixel count matches the value in the END H_BLANK
register 32_H. A count of 00_H corresponds to the 50% point of
the leading edge of the sync tip after leaving the part.
BLANK is asserted when the horizontal pixel count matches
the value in the START H_BLANK register 31_H/30_H. Note
that horizontally, BLANK is programmable with two pixel res-
olution.
START V_BLANK register 34_H/33_H and END V_BLANK reg-
ister 35_H determine which scan lines are blanked for each
field. During inactive scan lines, BLANK is asserted during the
entire scan line. Half-line blanking of the output video cannot
be done. Reference Figure 8 for active video timing and use
Table 2 for typical blanking programming values
TABLE 2. TYPICAL VALUES FOR HBLANK AND VBLANK REGISTERS
VIDEO STANDARD
(MSB/LSB)
ACTIVE TOTAL
PIXELS/ PIXELS/
LINE
LINE
LAST
PIXEL
COUNT
START
H_BLANK
(31H/30H)
END
H_BLANK
(32H)
START
V_BLANK
(34H/33H)
END
V_BLANK
(35H)
RECTANGULAR PIXELS
NTSC (M), PAL (M)
720
PAL (B, D, G, H, I,N, N_C) 720
SQUARE PIXELS
858
857 (0359_H)
842 (034A_H)
122 (7A_H)
259 (0103_H)
864
863 (035F_H)
852 (0354_H)
132 (84_H)
310 (0136_H)
19 (13_H)
22 (16_H)
NTSC (M), PAL (M)
640
PAL (B, D, G, H, I,N, N_C) 768
780
779 (030B_H)
758 (02F6_H)
118 (76_H)
259 (0103_H)
944
943 (03AF_H) 922 (039A_H)
154 (9A_H)
310 (0136_H)
19 (13_H)
22 (16_H)
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