AD9863 datasheet(34/40 Pages) AD

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AD9863

Rev. A| Page 34 of 40

Write Operations

The SPI write operation uses the instruction header to config-

ure a 1-byte or 2-byte register write using the 2/1 byte setting.

The instruction byte followed by the register data is written

serially into the device through the SDIO pin on rising edges

of the interface clock, SCLK. The data can be transferred MSB

first or LSB first, depending on the setting of the LSB-first

SDIO BiDir register setting.

Figure 52 to Figure 54 are examples of writing data into the

device. Figure 52 shows a 1-byte write in MSB-first mode;

Figure 53 shows a 2-byte write in MSB-first mode; and

Figure 54 shows a 2-byte write in LSB-first mode. Note the

differences between LSB- and MSB-first modes: both the

instruction header and data are reversed, and the second data

byte register location is different. In the default MSB-first

mode, the second data byte is written to a decremented

written to an incremented register address.

INSTRUCTION HEADER

tDS

tDH

tHI

tLO

tCLK

DON'T CARE

2/1

DON'T CARE

SEN

SCLK

SDIO

R/W

Figure 52. 1-Byte Serial Register Write in MSB-First Mode

tDS

tDH

tHI

tLO

tCLK

SEN

SCLK

SDIO

DON'T CARE

R/W

2/1

DON'T CARE

INSTRUCTION HEADER (REGISTER N)

Figure 53. 2-Byte Serial Register Write in MS-First Mode

tDS

tDH

tHI

tLO

tCLK

SEN

SCLK

SDIO

DON'T CARE

INSTRUCTION HEADER (REGISTER N)

R/W

2/1

Figure 54. 2-Byte Serial Register Write in LSB-First Mode

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