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AD9912
Rev. D | Page 28 of 40
Table 10. Serial Control Port, 16-Bit Instruction Word, MSB First
MSB LSB
I15 I14 I13 I12 I11 I10 I9 I8 I7 I6 I5 I4 I3 I2 I1 I0
R/
W
W1 W0 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
06763-043
CSB
SCLK
DON'T CARE
SDIO A12W0W1R/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
DON'T CARE
DON'T CARE
16-BIT INSTRUCTION HEADER REGISTER (N) DATA REGISTER (N – 1) DATA
Figure 51. Serial Control Port Write—MSB First, 16-Bit Instruction, Two Bytes Data
CS
SCLK
SDIO
SDO
REGISTER (N) DATA
16-BIT INSTRUCTION HEADER REGISTER (N – 1) DATA REGISTER (N – 2) DATA
REGISTER (N – 3) DATA
A12W0W1R/W
A11
A10 A9
A8 A7
A6
A5 A4
A3 A2 A1 A0
DON'T CARE
DON'T CARE
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
06763-057
Figure 52. Serial Control Port Read—MSB First, 16-Bit Instruction, Four Bytes Data
06763-045
t
S
DON'T CARE
DON'T CARE
W1 W0 A12 A11 A10 A9 A8 A7 A6 A5 D4 D3
D2 D1 D0
DON'T CARE
DON'T CARE
R/W
t
DS
t
DH
t
HI
t
LO
t
CLK
t
H
CSB
SCLK
SDIO
Figure 53. Serial Control Port Write—MSB First, 16-Bit Instruction, Timing Measurements
06763-046
DATABIT N – 1DATABIT N
CSB
SCLK
SDIO
SDO
t
DV
Figure 54. Timing Diagram for Serial Control Port Register Read
06763-047
CSB
SCLK
DON'T CARE
DON'T CARE
16-BIT INSTRUCTION HEADER REGISTER (N) DATA REGISTER (N + 1) DATA
SDIO
DON'T CARE
DON'T CARE
A0 A1 A2 A3 A4 A5
A6 A7 A8
A9 A10 A11 A12
D1D0R/WW1W0 D2
D3 D4 D5 D6 D7
D0 D1 D2
D3 D4 D5 D6 D7
Figure 55. Serial Control Port Write—LSB First, 16-Bit Instruction, Two Bytes Data