AD9549 datasheet(55/78 Pages) AD

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Preliminary Technical Data

AD9549

Rev.

PrA | Page 55 of 78

When LSB_First = 1b (LSB first), the instruction and data bytes

must be written from LSB to MSB. Multi-byte data transfers in

LSB first format start with an instruction byte that includes the

multiple data bytes. The serial control port internal byte address

generator increments for each byte of the multi-byte transfer

cycle.

The AD9549 serial control port register address decrements

from the register address just written toward 0000h for multi-

byte I/O operations if the MSB first mode is active (default). If

the LSB first mode is active, the serial control port register

address increments from the address just written toward 1FFFh

for multi-byte I/O operations.

Unused addresses are not skipped during multi-byte I/O

operations. The user should write the default value to a reserved

Note: It is more efficient to issue a new write command than

writing the default value to more than two consecutive reserved

(or unmapped) registers.

MSB

LSB

I15

I14

I13

I12

I11

I10

R/W

A12

A11

A10

Table 7: Serial Control Port, 16-Bit Instruction Word, MSB First

CSB

SCLK DON'T CARE

SDIO

A12

R/W

A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0

D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

DON'T CARE

16-BIT INSTRUCTION HEADER

Figure 39: Serial Control Port Write—MSB First, 16-Bit Instruction, 2 Bytes Data

CSB

SCLK

SDIO

SDO

16-BIT INSTRUCTION HEADER

A12

R/W

A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0

DON'T CARE

DON'T

CARE

D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

Figure 40: Serial Control Port Read—MSB First, 16-Bit Instruction, 4 Bytes Data

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