14
3�2�4 Synchronous Digital Input
The PCIe-69814 has three synchronous digital input channels, SDI0, SDI1 and SDI1. These
three digital input lines can be sampled synchronously with the Timebase clock for mixed
signal applications. Thus the data transfer can reach 80 Mbit/s when using internal 80 MS/s
Timebase clock. These three digital input lines are combined with ADC data and located in
3 LSB when SDI function is enabled, as shown.
SDI0
SDI1
SDI2
ADC
AFE
Analog Input
D Flip Flop
D
Q
CLK
D Flip Flop
D
CLK
D Flip Flop
D
CLK
0
t
i
B
5
1
t
i
B
X
ADC Data
CLK
Data
Q
Q
Timebase
Bit 1
Bit 2
Bit 3
SDI0
SDI1
SDI2
Figure 3-3: Synchronous Digital Input Operations
