ADLINK PXI-2006 - Manual (Page 75)

Operation Theory 65
EXTDTRIG and EXTWFTRIG
EXTDTRIG and EXTWFTRIG are dedicated digital trigger input
signals for A/D and D/A operations respectively. Please refer to
section 4.5 for detailed descriptions.
Category Timing signal Functionality Constraints
Dedicated input
EXTTIMEBASE
Replace the
internal
TIMEBASE
1. TTL-compatible
2. 1MHz to 40MHz
3. Affects on both A/D
and D/A operations
EXTDTRIG
External digi-
tal trigger
input for A/D
operation
1. TTL-compatible
2. Minimum pulse
width = 20ns
3. Rising edge or fall-
ing edge
EXTWFTRG
External digi-
tal trigger
input for D/A
operation
1. TTL-compatible
2. Minimum pulse
width = 20ns
3. Rising edge or fall-
ing edge
Multi-function input
AFI[0]
(Dual functions)
Replace the
internal
ADCONV
1. TTL-compatible
2. Minimum pulse
width = 20ns
3. Rising–edge sensi-
tive only
Replace the
internal
SCAN_STAR
T
1. TTL-compatible
2. Minimum Pulse
width > 2/TIMEBASE
AFI[1]
Replace the
internal
DAWR
1. TTL-compatible
2. Minimum pulse
width = 20ns
3.Rising–edge sensi-
tive only
Table 4-9: Auxiliary function input signals and the corresponding functionalities