AD9891 datasheet(16/58 Pages) AD

16 / 58 page

REV. A

–16–

AD9891/AD9895

Table III. CLPOB, CLPDM, and PBLK Individual Sequence Parameters

Length

Range

Description

SPOL

High/Low

Starting Polarity of Vertical Transfer Pulse for Sequences 0–3

TOG1

12b

0–4095 Pixel Location

First Toggle Position within Line for Sequences 0–3

TOG2

12b

0–4095 Pixel Location

Second Toggle Position within Line for Sequences 0–3

Table IV. HBLK Individual Sequence Parameters

Length

Range

Description

HBLKMASK

High/Low

Masking Polarity for H1 for Sequences 0–3 (0 = H1 Low, 1 = H1 High)

HBLKTOG1

12b

0–4095 Pixel Location

First Toggle Position within Line for Sequences 0–3

HBLKTOG2

12b

0–4095 Pixel Location

Second Toggle Position within Line for Sequences 0–3

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

Length

Range

Description

SCP1–SCP3

12b

0–4095 Line Number

CLPOB/PBLK SCP to Define Horizontal Regions 0–3

SPTR0–SPTR3

0–3 Sequence Number

Sequence Pointer for Horizontal Regions 0–3

Table VI. Horizontal Sequence Control Parameters for HBLK

Length

Range

Description

VTPRCP1–

12b

0–4095 Line Number

Vertical Region Change Positions (See Table IX.)

VTPRCP7

HBLKSPTR0–

0–3 Sequence Number

Sequence Pointer for HBLK Regions 0–7

HBLKSPTR7

UP TO FOUR INDIVIDUAL HORIZONTAL CLAMP AND BLANKING REGIONS MAY BE PROGRAMMED WITH-

IN A SINGLE FIELD, USING THE SEQUENCE CHANGE POSITIONS.

SEQUENCE CHANGE POSITION #1

SEQUENCE CHANGE POSITION #2

SEQUENCE CHANGE POSITION #3

SINGLE FIELD (1 VD INTERVAL)

CLAMP AND PBLK SEQUENCE REGION 1

SEQUENCE CHANGE POSITION #0

(V-COUNTER = 0)

CLAMP AND PBLK SEQUENCE REGION 4

CLAMP AND PBLK SEQUENCE REGION 3

CLAMP AND PBLK SEQUENCE REGION 2

Figure 16. Clamp and Blanking Sequence Flexibility

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

readout into four separate regions, as shown in Figure 16. The

SCP0 is always hard-coded to line 0, and SCP1–SCP3 are

the SPTR Registers designate which sequence is used by each

signal. CLPOB and CLPDM share the same SCP, PBLK has a

separate set of SCP, and HBLK shares the vertical RCP (see

Vertical Timing Generation section). For example,

CLPSCP1 will define Region 0 for CLPOB and CLPDM,

and in that region any of the four individual CLPOB and

CLPDM sequences may be selected with the SPTR Registers.

The next SCP defines a new region, and in that region each

signal can be assigned to a different individual sequence. Be-

cause HBLK shares the vertical RCP, there are up to eight

regions where HBLK sequences may be changed using the eight

HBLKSPTR Registers.

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