Datasheet

AD9508 Data Sheet
Rev. B | Page 28 of 40
Figure 49. Serial Control Port Read—MSB First, 16-Bit Instruction, Four Bytes of Data
Figure 50. Serial Control Port Write—MSB First, 16-Bit Instruction, Timing Measurements
Figure 51. Timing Diagram for Serial Control Port Register Read
Figure 52. Serial Control Port Write—LSB First, 16-Bit Instruction, Two Bytes of Data
Figure 53. Serial Control Port Timing—Write
CS
SCLK
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
11161-029
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
HIGH
t
LOW
t
CLK
t
C
CS
SCLK
SDIO
11161-030
DATA BIT N – 1DATA BIT N
CS
SCLK
SDIO
SDO
t
DV
11161-031
CS
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
11
161-032
CS
SCLK
SDIO
t
HIGH
t
LOW
t
CLK
t
S
t
DS
t
DH
t
C
BIT N BIT N + 1
11161-033