AD9927BBCZ datasheet(40/100 Pages) AD

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AD9927

Rev. 0 | Page 40 of 100

Special Pattern Insertion

Additional flexibility is available using the SPC_PAT_EN registers,

which allows a Group B, C, or D pattern to be inserted into a series

of Group A repetitions. This feature is useful when a different

pattern is needed at the start, middle, or end of a sequence.

Figure 47 shows an example of a sweep region using VPATA

with multiple repetitions where a single repetition of VPATB has

been added into the middle of the sequence. Figure 48 shows

more detail on how to set the registers to achieve the desired

timing.

Note that VREPB is used to specify which repetition number

has the special pattern inserted instead of VPATA. VPATB

always has priority over VPATC or VPATD if more than one

SPC_PAT_EN bit is enabled (SPC_PAT_EN [0] has priority).

XV1 TO XVN

REGION 1: SWEEP REGION

LINE 0

LINE 1

REGION 0

REGION 2

LINE 24

LINE 25

LINE 2

SCP1

SCP2

PATTERN B INSERTED DURING PATTERN A REPETITIONS

Figure 47. Example of Special Pattern Insertion

XV1

V-PATTERN A

V-PATTERN B

V-PATTERN A

REP 1

REP 2

REP N

REP 5

REP 4

REP 3

DESCRIPTION:

SPC_PAT_EN[0] = 1

V-PATTERN B IS USED AS SPECIAL PATTERN

VREPA = N

TOTAL NUMBER OF REPS USED FOR SEQUENCE (N REPS)

VREPB = 4

REP 4 USES V-PATTERN B INSTEAD OF V-PATTERN A

NOTES

1. VSTARTB MUST BE SET EQUAL TO VSTARTA.

Figure 48. Example of Special Pattern Insertion, Detail

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