AD9849 datasheet(23/36 Pages) AD

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REV. 0

AD9848/AD9849

–23–

Horizontal Sequence Control

The AD9848/AD9849 uses Sequence Change Positions (SCP)

and Sequence Pointers (SPTR) to organize the individual horizon-

tal sequences. Up to four SCPs are available to divide the

readout into four separate regions, as shown in Figure 12.

The SCP 0 is always hard-coded to line 0, and SCP1–3 are regis-

ter programmable. During each region bounded by the SCP, the

SPTR registers designate which sequence is used by each signal.

HBLK

. . .

THE POLARITY OF H1 DURING BLANKING IS PROGRAMMABLE (H2 IS OPPOSITE POLARITY OF H1)

H1/H3

H2/H4

. . .

Figure 11. HBLK Masking Control

NOTE

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 12. Clamp and Blanking Sequence Flexibility

Table VI. Horizontal Sequence Control Parameters for CLPOB, CLPDM, PBLK, and HBLK

Length

Range

Description

SCP1–SCP3

12b

0–4095 Line Number

CLAMP/BLANK SCP to Define Horizontal Regions 0–3

SPTR0–SPTR3

0–3 Sequence Number

Sequence Pointer for Horizontal Regions 0–3

CLPOB, CLPDM, PBLK, and HBLK each have a separate

set of SCP. For example, CLPOBSCP1 will define Region 0

for CLPOB, and in that region any of the four individual

CLPOB sequences may be selected with the CLPOBSPTR

registers. 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 VI.

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