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Receiver Cards
2-26
2.12 Receiver Cards
Receiver cards place a load on the backplane and provide a point to monitor
the signals. There are two types of receiver cards: one that has built-in monitor
points, and one with no monitor points. Either type can be placed in any slot
in the backplane, typically with the monitored receiver card placed in the slots
under observation. There is a monitor point for only one bit per group. Only a
few receiver cards have monitor points because the capacitance added by the
monitor point affects backplane signal integrity. Minimal use of the monitored
receiver card is encouraged because of the increased loading this card
causes.
Receiver cards have GTLP devices hardwired for clocked storage in the
B-to-A direction. Data is latched on the rising edge of the GTLP latch clock. The
latch clock comes from the system clock when the MODESEL line is high, and
from the GTLP clock when the MODESEL line is low. The receiver card is a
six-layer PCB with two signal layers, a V
CC
plane, a ground plane, then two
signal layers. The GTLP data and clock stub lines are approximately 1 in. in
length. Stackup is shown in Table 2–7.
Table 2–7. Receiver-Card Stackup
Trace Name
Use
Layer
Copper
Weight (oz)
Physical
Representation
Dielectric
Height (in.)
Dielectric
Name
Top
Data signal
1
0.5
0.004
B stage
Internal signal 2
Data signal
2
1
0.004
Core
V
CC
plane
V
CC
plane
3
1
0.004
B stage
Ground plane
Ground plane
4
1
0.004
Core
Internal signal 3
Data signal
5
1
0.004
B stage
Bottom
Data signal
6
1
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 ...