Datasheet
Monitored Waveforms
7–361
Waveform Measurement and Interpretation
4.6 Monitored Waveforms
There are differences in waveforms between GTLP monitor test points and
measurements taken at the backplane connector pins, due to interference
from LVTTL data and clock signals not shielded adequately on the daughter
cards. This concern is only for this demonstration backplane because there is
no reason to extend the GTLP signals past the GTLP device B-port output pins
on operational daughter cards. Figures 4–6 and 4–7 show the difference
between waveforms taken directly on the backplane and those taken from the
monitor test points under fully loaded conditions at a clock frequency of
23 MHz. Waveforms shown in Figures 4–6 and 4–7 are at one-half clock
frequency, or 11.5 MHz, and are taken with various termination cards.
Figure 4–6. GTLP Backplane Waveforms at 23-MHz Clock Frequency
Figure 4–7. GTLP Monitor Test-Point Waveforms at 23-MHz Clock Frequency