Termination Cards
2-15
GTLP EVM Board Typical Test and Setup Configuration
2.7
Termination Cards
Because proper backplane termination has a large effect on signal integrity
and is investigated easily, Group 1 has removable termination cards on the
back of the backplane (see Figure 2–13). The termination cards are identical,
except for the resistor values that are 25
Ω
, 33
Ω
, 38
Ω
, or 50
Ω
. One bypass
capacitor is mounted with every other termination resistor to limit voltage
fluctuations. The termination cards provide a method of varying the
termination resistance to only Group 1 data lines. These termination resistors
connect to the V
TT
supply (1.5 V because GTLP levels are used).
Figure 2–13. Termination Card Location (Left) and Close-Up View (Right)
Match Dots
Connector Key.
Can be reversed, so
ensure that dots are
on the same side.
The termination cards have a four-layer stackup. The stackup is signal layer,
V
CC
plane, ground plane, and signal layer (see Table 2–4).
Summary of Contents for GTLP
Page 1: ...June 2001 Standard Linear Logic GTLP Evaluation Module EVM User s Guide ...
Page 2: ...Printed in U S A 0601 SCEA023 ...
Page 3: ...GTLP Evaluation Module EVM User s Guide SCEA023 June 2001 Printed on Recycled Paper ...
Page 12: ...Tables x ...
Page 26: ...Connectors 2 10 Figure 2 7 AMP Single Line Model Data Sheet ...
Page 65: ...Monitored Waveforms 4 8 ...
Page 71: ...Damage to the Daughter Cards 5 6 ...
Page 79: ...Board Layouts and Schematics A 8 Figure A 4 Backplane Schematic ...
Page 81: ...Board Layouts and Schematics A 10 Figure A 6 Driver Card Schematic ...