AD9923ABBCZ datasheet(67/88 Pages) AD

67 / 88 page

AD9923A

Rev. 0 | Page 67 of 88

LAYOUT OF INTERNAL REGISTERS

The AD9923A address space is divided into two register areas,

as illustrated in Figure 86. In the first area, Address 0x00 to

Address 0x91 contain the registers for the AFE, miscellaneous

functions, VD/HD parameters, timing core, CLPOB masking,

SG patterns, shutter functions, and memory configuration. The

second area of the address space, beginning at Address 0x400,

consists of the registers for the V-pattern groups, V-sequences,

and fields. This is a configurable set of registers; the user can

decide how many V-pattern groups, V-sequences, and fields are

used in a particular design. Therefore, the addresses for these

registers vary, depending on the number of V-patterns and

V-sequences chosen.

specify the total number of V-pattern groups and V-sequences

used. The starting address for the V-pattern groups is 0x400.

The starting address for a V-sequence is based on the number

of V-pattern groups used, with each V-pattern group occupying

40 register addresses. The starting address for a field register

depends on both the number of V-pattern groups and the

number of V-sequences. Each V-sequence occupies 20 register

addresses, and each field occupies 12 register addresses.

The starting address for a V-sequence is equal to 0x400 plus the

number of V-pattern groups times 40. The starting address for a

field is equal to the starting address of a V-sequence plus the

number of V-sequences times 20. The VPAT, VSEQ, and field

registers must occupy a continuous block of addresses.

Figure 87 shows an example with three V-pattern groups, four

V-sequences, and two fields. The starting address for the V-pattern

groups is 0x400. Because VPAT_NUM = 3, the V-pattern groups

occupy 120 address locations. The start of the V-sequence register

is 0x400 + 120 = 0x478. With VSEQ_NUM = 3, the V-sequences

occupy 60 address locations. Therefore, the field registers begin at

0x448 + 60 = 0x4B4.

The AD9923A address space contains many unused addresses.

Undefined addresses between Address 0x00 and Address 0x399

should not be written to, or the AD9923A might operate

incorrectly. Continuous register writes should be performed

carefully to avoid writing to undefined registers.

FIXED REGISTER AREA

ADDR 0x00

ADDR 0x90

ADDR 0x10

ADDR 0x20

ADDR 0x30

ADDR 0x40

ADDR 0x50

ADDR 0x60

V-PATTERN GROUPS

(EACH GROUP USES 40 REGISTERS)

V-SEQUENCES

(EACH VSEQ USES 20 REGISTERS)

CONFIGURABLE REGISTER DATA

ADDR 0x400

FIELDS

(EACH FIELD USES 12 REGISTERS)

MAX 0x7FF

VSEQ START

FIELD START

ADDR 0xFF

ADDR 0x92

AFE REGISTERS

CONFIGURE MEMORY USING

VPAT_NUM AND VSEQ_NUM

MISCELLANEOUS REGISTERS

VD/HD REGISTERS

TIMING CORE REGISTERS

CLPOB MASK REGISTERS

SG PATTERN REGISTERS

SHUTTER CONTROL REGISTERS

INVALID DO NOT ACCESS

Figure 86. Layout of AD9923A Registers

ADDR 0x400

ADDR 0x478

ADDR 0x4B4

ADDR 0x4CC

MAX 0x7FF

3 V-PATTERN GROUPS

(40 × 3 = 120 REGISTERS)

4 V-SEQUENCES

(20 × 3 = 60 REGISTERS)

2 FIELDS

(12 × 2 = 24 REGISTERS)

UNUSED MEMORY

Figure 87. Example of Register Configuration

AD9923ABBCZ 数据表(PDF) 67 Page - Analog Devices

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