©
National Instruments
9-1
X Series User Manual
9
Digital Routing and Clock
Generation
The digital ro
u
ting circ
u
itry has the following main f
u
nctions:
•
Manages the flow of data between the b
u
s interface and the
acq
u
isition/generation s
u
b-systems (analog inp
u
t, analog o
u
tp
u
t,
digital I/O, and the co
u
nters). The digital ro
u
ting circ
u
itry
u
ses FIFOs
(if present) in each s
u
b-system to ens
u
re efficient data movement.
•
Ro
u
tes timing and control signals. The acq
u
isition/generation
s
u
b-systems
u
se these signals to manage acq
u
isitions and generations.
These signals can come from the following so
u
rces:
–
Yo
u
r X Series device
–
Other devices in yo
u
r system thro
u
gh RTSI
–
User inp
u
t thro
u
gh the PFI terminals
–
User inp
u
t thro
u
gh the PXI_STAR terminal
•
Ro
u
tes and generates the main clock signals for the X Series device.
Clock Routing
Fig
u
re 9-1 shows the clock ro
u
ting circ
u
itry of an X Series device.
Figure 9-1.
X Series Clock Routing Circuitry
RT
S
I <0..7>
On
b
o
a
rd
100 MHz
O
s
cill
a
tor
Extern
a
l
Reference
Clock
(To RT
S
I <0..7>
O
u
tp
u
t
S
elector
s
)
10 MHz RefClk
PLL
÷
5
÷
200
÷
10
PXIe_CLK100
PXI_
S
TAR
100 MHz
Time
bas
e
100 kHz
Time
bas
e
20 MHz
Time
bas
e
PFI
PXIe-D
S
TAR<A, B>
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