Datasheet

Data Sheet AD9525
Rev. A | Page 29 of 48
Table 26. 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 = 0 A11 = 0 A10 = 0 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
CS
S
CLK
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
10011-029
Figure 28. Serial Control Port Write—MSB First, 16-Bit Instruction, Two Bytes of Data
CS
S
CLK
SDIO
SDO
REGISTER (N) DATA16-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
10011-030
Figure 29. Serial Control Port Read—MSB First, 16-Bit Instruction, Four Bytes of Data
t
S
DON'T CARE
DON'T CARE
W1W0A12A11A10A9A8A7A6A5D4D3D2D1D0
DON'T CARE
DON'T CARE
R/W
t
DS
t
DH
t
HIGH
t
LOW
t
CLK
t
C
CS
SCLK
SDIO
10011-031
Figure 30. Serial Control Port Write—MSB First, 16-Bit Instruction, Timing Measurements
DATA BIT N – 1DATA BIT N
CS
S
CLK
SDIO
SDO
t
DV
10011-032
Figure 31. Timing Diagram for Serial Control Port Register Read
CS
S
CLK
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
10011-033
Figure 32. Serial Control Port Write—LSB First, 16-Bit Instruction, Two Bytes of Data