Chapter 4
Receive/ Monitor Mode
DAS-429PCI/Mx: User’s Manual
page 4 - 5
4.2.3
Time Tag Word Description
The Time Tag is a 32-bit word made up of two 16-bit words; Time Tag-Hi and
Time Tag-Lo. The resolution of the Time tag is 10
µ
sec/bit.
Figure 4-4
Time Tag Word Description
Note:
There is a latency between the time a Word is received on the bus and the
time that Word is recorded in dual-port RAM. This latency is affected by
the number of channels and data rate of these channels. The Time tag
reflects the time the Word is written to dual-port RAM rather than the
time the Word is received over the bus. In no event shall this latency
exceed a single hi-speed Word time i.e., 360 microseconds.
0
LSB
Time Tag
Word - Lo
Time Tag
Word - Hi
07
06
05
04
03
02
01
00
15
14
13
12
11
10
09
08
23
22
21
20
19
18
17
16
31
30
29
28
27
26
25
24
15
MSB
8 7
.
.
.
.
.
.
High byte
Low byte
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