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AD9949KCP Datasheet(PDF) 23 Page - Analog Devices |
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AD9949KCP Datasheet(HTML) 23 Page - Analog Devices |
23 / 36 page AD9949 Rev. B | Page 23 of 36 GENERATING SPECIAL HBLK PATTERNS Six toggle positions are available for HBLK. Normally, only two of the toggle positions are used to generate the standard HBLK interval. However, the additional toggle positions may be used to generate special HBLK patterns, as shown in Figure 24. The pattern in this example uses all six toggle positions to generate two extra groups of pulses during the HBLK interval. By changing the toggle positions, different patterns can be created. HORIZONTAL SEQUENCE CONTROL The AD9949 uses sequence change positions (SCP) and sequence pointers (SPTR) to organize the individual horizontal sequences. Up to four SCPs are available to divide the readout into four separate regions, as shown in Figure 25. The SCP0 is always hard-coded to Line 0, and SCP1 to SCP3 are register programmable. During each region bounded by the SCP, the SPTR registers designate which sequence is used by each signal. CLPOB, PBLK, and HBLK each have a separate set of SCPs. For example, CLPOBSCP1 defines Region 0 for CLPOB, and in that region any of the four individual CLPOB sequences may be selected with the CLPOBSPTR register. The next SCP defines a new region and in that region, each signal can be assigned to a different individual sequence. The sequence control registers are summarized in Table 20. EXTERNAL HBLK SIGNAL The AD9949 can also be used with an external HBLK signal. Setting the HBLKDIR register (Address 0×40) to high disables the internal HBLK signal generation. The polarity of the exter- nal signal is specified using the HBLKPOL register, and the masking polarity of H1 is specified using the HBLKMASK register. Table 21 summarizes the register values when using an external HBLK signal. UP TO FOUR INDIVIDUAL HORIZONTAL CLAMP AND BLANKING REGIONS MAY BE PROGRAMMED WITHIN A SINGLE FIELD, USING THE SEQUENCE CHANGE POSITIONS. SEQUENCE CHANGE OF POSITION 1 SEQUENCE CHANGE OF POSITION 2 SEQUENCE CHANGE OF POSITION 3 SINGLE FIELD (1 VD INTERVAL) CLAMP AND PBLK SEQUENCE REGION 0 SEQUENCE CHANGE OF POSITION 0 (V-COUNTER = 0) CLAMP AND PBLK SEQUENCE REGION 3 CLAMP AND PBLK SEQUENCE REGION 2 CLAMP AND PBLK SEQUENCE REGION 1 Figure 25. Clamp and Blanking Sequence Flexibility Table 21. External HBLK Register Parameters Register Length Range Description HBLKDIR 1b High/Low Specifies HBLK Internally Generated or Externally Supplied. 1 = External. HBLKPOL 1b High/Low External HBLK Active Polarity. 0 = Active Low. 1 = Active High. HBLKEXTMASK 1b High/Low External HBLK Masking Polarity. 0 = Mask H1 Low. 1 = Mask H1 High. |
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