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DDIx_HPD: DDI Interface #x Hot Plug Detect. This signal is tied to GND through a
DDIx_DDC_AUX_SEL: DDI Interface #x Cable Adapter Detect signal. When this signal is detected high, then on the connector there is the TMDS interface (it means
that a DP-to-HDMI adapter is connected). This signal is tied to GND through a 1MOhm resistor.
DDIx_CEC: this signal is tied to GND through a 5.1MOhm resistor.
POST Code Display
For debugging purposes, it is available a display made by 4x 7-segment LED display, type Kingbright KCSC02-105 or equivalent.
The management of this display is done using a LC4064V-75TN44I CPLD, driven through the COM Express
JTAG Connector
JTAG Connector
Pin
Signal
Pin
1
+3.3V_RUN
2
GND
3
POST_TCK
4
N.C.
FAN Connector
FAN Connector
CN32
Pin
Signal
1
GND
2
FAN_PWR
3
FAN_TACHO_IN
4
FAN_PWM
JP9 position
FAN driver mode selector
1-2
4-Wires Fan
2-3
3-Wires Fan
™
from COM Express
module, in order to support 3-wire tachometric fans.
CCOMe-C96
CCOMe-C96 - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: A.R. - Reviewed by C.M. Copyright © 2021 SECO S.p.A.
For the programming of CPLD used to manage POST Code Display, it is available a JTAG
CN16
connector CN16, which is a single row, 7 pin, P2.54mm standard pin header, type ADIMPEX
p/n NPE08007-R.
Signal
POST_TCK:
5
POST_TDO
POST_TDO: JTAG Test Data Out Signal
6
POST_TDI
POST_TDI: JTAG Test Data In, +3.3V_RUN
7
POST_TMS
POST_TMS: JTAG Test Mode Select, +3.3V_RUN
Onboard it is available a 4-pin connector, type MOLEX p/n 47053-3000 or equivalent, for the connection of
tachometric FANs. Please be aware that the use of an external fan depends strongly on customer's
application/installation. Fan Speed control must be supported by COM Express
FAN_TACHIN and FAN_PWMOUT. Please refer to chapter 4.1 for considerations about thermal dissipation.
FAN_PWR: +12V_RUN derived power rail for FAN, managed by PWM signal FAN_PWMOUT coming from COM Express
connector. FAN_PWR is fixed +12V_RUN in 4-wires Fan, while is pulse width modulated via FAN_PWMOUT for 3-wires Fan
FAN_TACHO_IN: tachometric input from the fan to the COM Express module
FAN_PWM: PWM output to the fan, +5V_
Fan.
As stated above, by using a dedicate jumper JP9, it is possible to select if FAN_PWR is fixed to +12V_RUN, in
order to support 4-wire tachometric fans, or must be controlled by the signal FAN_PWMOUT, coming directly
resistor.
™
LPC Bus
module through signals
-wires
64
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