AD9895_15 Datasheet, PDF (16/58 Pages) Analog Devices – CCD Signal Processors with Precision Timing Generator

AD9891/AD9895
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
register programmable. During each region bound by the SCP,
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.
Register
SPOL
TOG1
TOG2
Table III. CLPOB, CLPDM, and PBLK Individual Sequence Parameters
Length
1b
12b
12b
Range
High/Low
0–4095 Pixel Location
0–4095 Pixel Location
Description
Starting Polarity of Vertical Transfer Pulse for Sequences 0–3
First Toggle Position within Line for Sequences 0–3
Second Toggle Position within Line for Sequences 0–3
Register
HBLKMASK
HBLKTOG1
HBLKTOG2
Length
1b
12b
12b
Table IV. HBLK Individual Sequence Parameters
Range
High/Low
0–4095 Pixel Location
0–4095 Pixel Location
Description
Masking Polarity for H1 for Sequences 0–3 (0 = H1 Low, 1 = H1 High)
First Toggle Position within Line for Sequences 0–3
Second Toggle Position within Line for Sequences 0–3
Table V. Horizontal Sequence Control Parameters for CLPOB, CLPDM, and PBLK
Register
Length
SCP1–SCP3 12b
SPTR0–SPTR3 2b
Range
0–4095 Line Number
0–3 Sequence Number
Description
CLPOB/PBLK SCP to Define Horizontal Regions 0–3
Sequence Pointer for Horizontal Regions 0–3
Register
VTPRCP1–
VTPRCP7
HBLKSPTR0–
HBLKSPTR7
Length
12b
2b
Table VI. Horizontal Sequence Control Parameters for HBLK
Range
0–4095 Line Number
Description
Vertical Region Change Positions (See Table IX.)
0–3 Sequence Number Sequence Pointer for HBLK Regions 0–7
SEQUENCE CHANGE POSITION #0
(V-COUNTER = 0)
SEQUENCE CHANGE POSITION #1
SEQUENCE CHANGE POSITION #2
SINGLE FIELD (1 VD INTERVAL)
CLAMP AND PBLK SEQUENCE REGION 1
CLAMP AND PBLK SEQUENCE REGION 2
CLAMP AND PBLK SEQUENCE REGION 3
SEQUENCE CHANGE POSITION #3
CLAMP AND PBLK SEQUENCE REGION 4
UP TO FOUR INDIVIDUAL HORIZONTAL CLAMP AND BLANKING REGIONS MAY BE PROGRAMMED WITH-
IN A SINGLE FIELD, USING THE SEQUENCE CHANGE POSITIONS.
Figure 16. Clamp and Blanking Sequence Flexibility
–16–
REV. A