37
Eight LVDS triggers are provided through double stacked micro-D connectors. The stacked
configuration allows easy daisy chaining and termination of the LVDS triggers to other modules.
There is a one-to-one connection of signals on the connectors (i.e., pin 1 is tied to pin 1, pin 2 is
tied to pin2, and so on). Refer to Appendix A for pin-out details. For proper operation, the
LVDS triggers must be properly terminated. Information about connection and termination
techniques is available on the LXI Standard website (
). However, the
LVDS triggers have currently not been tested for LXI compliance. Use should be limited to non-
LXI applications.
Figure 12. Trigger Logic (Input Direction)
Figure 13. Trigger Logic (Output Direction)
4.9
FAN AND TEMPERATURE CONTROL
The EM405-8 contains three on-board temperature sensors. One is near the fan input, one is in
the area of main carrier control logic, and the other is in the M-Module area. These sensors can
be read by reading the three
Temperature Status
registers of the EM405-8. The TEMPx field
inside this register represents the current temperature as read by the temperature sensor. To
translate the TEMPx value in to degrees Celsius use the following equation:
If bit 9 = 0 then °C = TEMPx / 4, and
if bit 9 = 1 then °C = – (TEMPB – 1536) / 4)
The temperature sensors are also read by the firmware and used to control the variable speed fan.
When the fan is set to
variable
, the firmware constantly monitors the temperature and increases
the fans to Full ON if the temperature gets above a preset level. The variable fan is designed to
NORMAL/INVERTED
SIGNALOUT
SRCSEL
MTRIGA0-7
MTRIGB0-7
LVDSTRIG0-7
EXTINTRIG
CONDITIONED SIGNAL
NORMAL/INVERTED
RISING/FALLING
SIGNALIN
CONDITIONED
SIGNAL
EDGE/LEVEL
EDGECLK0
EDGESEL
EDGECLK1
EDGECLK2
EDGECLK3
L
E
C&H Technologies, Inc. <> 445 Round Rock West Drive <> Round Rock, Texas 78681 <> www.chtech.com
Содержание EM405-8
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