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48
DM35425HR User’s Manual
6.5.10
PRE_TRIGGER_CAPTURE
(R
EAD
/W
RITE
)
Number of samples to collect before the Start Trigger. The length is limited by the FIFO size
–
writing a value larger than the FIFO size will
have indeterminate results.
6.5.11
POST_STOP_CAPTURE
(R
EAD
/W
RITE
)
Number of samples to collect after the Stop Trigger.
6.5.12
SAMPLE_CNT
(R
EAD
O
NLY
)
Total number of samples collected. This only increment
while in the “Filling Pre
-
Trigger buffer”, “Sampling/Waiting for stop trigger” and “Filling
Post-
Stop buffer” state. It also continues counting after a Re
-Arm.
While in Parallel Mode, samples collected is only accurate when P_BUS_CLK is low.
6.5.13
INT_ENA
(M
ASKABLE
R
EAD
/W
RITE
)
Each bit corresponds to an interrupt source. A
value of ‘1’ enables the source, and a value of ‘0’ disables it. See below for a description of the
sources.
6.5.14
INT_STAT
(R
EAD
/C
LEAR
)
Each bit corresponds to an interrupt source. Reading a value of ‘1’ indicates that an event has occurred. Reading a value of ‘0’ indicates that
the event has not occurred. Writing a ‘1’ will clear that bit.
B0: Sample
–
A sample has been taken.
B1: Advanced Int
B2: Pre-Start Buffer Filled
B3: Start Trigger
B4: Stop Trigger
B5:Post-Stop Buffer Filled
B6: Sampling has completed and the FIFO is empty (all data transferred to host)
B7: Pacer
–
The pacer clock has ticked.
B8: CN3 5V Over Current
B9: CN4 5V Over Current
6.5.15
CLK_BUS
N
NOTE: If a CLK_BUS is unassigned in all function blocks, it defaults to
System Clock/Immediate.
Select the source to drive onto Clock Bus N. That clock bus can then be used by a different function block as a clock source or trigger.
A function block can drive multiple different Clock Buses. However, a Clock Bus N should not be driven by more than one function block at the
same time or the clock signal will be undefined.
B[7:0]:
0x00:
Disables Clock Source
0x80:
Sample
–
A sample has been taken.
0x81:
Advanced Int
0x82:
Pre-Start Buffer Filled
0x83:
Start Trigger
0x84:
Stop Trigger
0x85:
Post-Stop Buffer Filled
0x86:
Sampling has completed and the FIFO is empty (all data transferred to host)
