National Instruments NI-6587 Getting Started Manual page 20

Strobe Bypass Control
from NI FlexRIO FPGA Module
(GPIO_8_n)
Acquisition Bank I/O Clock
to NI FlexRIO FPGA Module
GPIO_56_CC
GPIO_56_n_CC
Generation Bank I/O Clock
to NI FlexRIO FPGA Module
GPIO_26_CC
GPIO_26_n_CC
PFI Bank I/O Clock
to NI FlexRIO FPGA Module
GPIO_38_CC
GPIO_38_n_CC
Global Clock
to NI FlexRIO FPGA Module
UserGclkLvds
UserGclkLvds_n
In software, each clock output terminal is accessed with a U8 data type. The following table
shows the values of the crosspoint switch clock options.
Value
0 Tristate—Output disabled (high impedance).
2 Sync Clock (PXI Express Only)—Clock from PXI Express backplane. You can
select PXI_CLK10 or DStarA in the Details category of the IO Module Properties
dialog box.
Adapter Module Onboard Clock—Clock generated from the Si570 clock chip.
3
Strobe From Crosspoint Switch—LVDS STROBE signal from crosspoint switch.
4
Use this setting to route the LVDS STROBE signal to multiple I/O clocks.
Strobe Bypass—LVDS STROBE bypasses the crosspoint switch. The propagation
5
delay of the Strobe Bypass exactly matches the propagation delay of the data
channels. This setting is ideal for source- synchronous applications.
Figure 12. Crosspoint Switch
2
2
2
2
2
2
Crosspoint
Table 7. Clock Values
Clock Option
NI 6587 Getting Started Guide | © National Instruments | 19
2
2
2
2
4×4
Switch
STROBE
2
Sync Clock (PXIe Only)
Adapter Module Onboard Clock
Reserved