Datasheet

AD9920A
Rev. B | Page 25 of 112
HD
HBLK
BASIC HBLK PULSE IS GENERATED USING HBLKSTART AND HBLKEND REGISTERS
BLANK BLANK
HBLKSTART HBLKEND
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Figure 29. Typical Horizontal Blanking Pulse Placement (HBLK_MODE = 0)
HD
HBLK
H1/H3/H5/H7
H1/H3/H5/H7
H2/H4/H6/H8
THE POLARITY OF H1/H3/H5/H7 DURING BLANKING IS PROGRAMMABLE
(H2/H4/H6/H8 AND HL ARE SEPARATELY PROGRAMMABLE)
0
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Figure 30. HBLK Masking Polarity Control
HBLK
H1/H3
H2/H4
HBLKTOGE2
HBLKTOGE1 HBLKTOGE3
HBLKTOGE6
HBLKTO
G
E5
HBLKTOGE4
HBLKSTART
HBLKEND
SPECIAL H-BLANK PATTERN IS CREATED USING MULTIPLE HBLK TOGGLE POSITIONS
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Figure 31. Using Multiple Toggle Positions for HBLK (HBLK_MODE = 0)
HBLK
H1/H3
H2/H4
HBLKSTART HBLKTOGE1
HBLKTOGE2
HBLKENDHBLKTOGE3
HBLKTOGE4
HBLKLEN
H-BLANK REPEATING PATTERN IS CREATED USING HBLKLEN AND HBLKREP REGISTERS
HBLKREP NUMBER 1 HBLKREP NUMBER 2 HBLKREP NUMBER 3
HBLKREP = 3
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Figure 32. HBLK Repeating Pattern Using HBLK_MODE = 0