AD9979BCPZ datasheet(21/56 Pages) AD

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AD9979

Rev. C | Page 21 of 56

HBLK Mode 2 Operation

HBLK Mode 2 allows more advanced HBLK pattern operation.

If unevenly spaced, multiple areas of HCLK pulses are needed;

therefore, use HBLK Mode 2. Using a separate set of registers,

HBLK Mode 2 can divide the HBLK region into up to six

different repeat areas (see Table 11). As shown in Figure 28,

each repeat area shares a common group of toggle positions,

HBLKSTARTA, HBLKSTARTB, and HBLKSTARTC. However, the

number of toggles following each HBLKSTARTA, HBLKSTARTB,

and HBLKSTARTC position can be unique in each repeat area

by using RAxHyREPz, where x represents the repeat area, from 0

to 5, y represents the horizontal driver, 1 or 2, and z represents the

HBLK repeat area start position for HBLK Mode 2, A, B, or C.

As shown in Figure 29, setting the RAxH1REPA/RAxH1REPB/

RAxH1REPC or RAxH2REPA/RAxH2REPB/RAxH2REPC

registers to 0 masks the HCLK groups from appearing in a

particular repeat area. Figure 28 shows only two repeat areas

being used, although up to six are available. It is possible to

program a separate number of repeat area repetitions for H1

and H2, but generally, the same value is used for both H1 and H2.

Figure 28 shows the example

RA0H1REPA/RA0H1REPB/RA0H1REPC =

RA0H2REPA/RA0H2REPB/RA0H2REPC =

RA1H1REPA/RA1H1REPB/RA1H1REPC =

RA1H2REPA/RA1H2REPB/RA1H2REPC = 2.

Furthermore, HBLK Mode 2 allows a different HBLK pattern

on even and odd lines. HBLKSTARTA, HBLKSTARTB, and

HBLKSTARTC, as well as RAxH1REPA/RAxH1REPB/

RAxH1REPC and RAxH2REPA/RAxH2REPB/RAxH2REPC,

define operation for the even lines. For separate control of the

odd lines, the HBLKALT_PATx registers specify up to six repeat

areas on the odd lines by reordering the repeat areas used for the

even lines. New patterns are not available, but the order of the

previously defined repeat areas on the even lines can be changed

for the odd lines to accommodate advanced CCD operation.

HBLK

HBLKSTART

HBLKSTARTA

HBLKEND

HBLKLEN

REPEAT AREA 0

HBLKREP = 2

TO CREATE 2 REPEAT AREAS

REPEAT AREA 1

HBLKSTARTB

HBLKSTARTC

RA0H1REPA RA0H1REPB

RA0H1REPC

ALL RAxHyREPz REGISTERS = 2, TO CREATE 2 HCLK PULSES

RA1H1REPA RA1H1REPB

RA1H1REPC

RA0H2REPA RA0H2REPB

RA0H2REPC

RA1H2REPA RA1H2REPB

RA1H2REPC

Figure 28. HBLK Mode 2 Registers

HBLKSTART

HBLKEND

REPEAT AREA 0

REPEAT AREA 1

REPEAT AREA 2

REPEAT AREA 3

REPEAT AREA 4

REPEAT AREA 5

MASK A, B, C PULSES IN ANY REPEAT

AREA BY SETTING RAxHyREPz = 0

CHANGE NUMBER OF A, B, C PULSES IN ANY

REPEAT AREA USING RAxHyREPz REGISTERS

CREATE UP TO 3 GROUPS OF TOGGLES

A, B, C COMMON IN ALL REPEAT AREAS

Figure 29. HBLK Mode 2 Operation

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