Table 29 Miscellaneous Signal Descriptions; Table 30 General Purpose I/O Signal Descriptions - Congatec COM Express conga-TCA7 User Manual

Table 29 Miscellaneous Signal Descriptions
Signal Pin Description
I2C_CK B33 General purpose I²C port clock output/input
I2C_DAT B34 General purpose I²C port data I/O line
SPKR B32 Output for audio enunciator, the "speaker" in PC-AT systems
1
WDT B27 Output indicating that a watchdog time-out event has occurred
FAN_PWMOUT 2 B101 Fan speed control
Uses the Pulse Width Modulation (PWM) technique to control the fan's RPM
FAN_TACHIN B102 Fan tachometer input
2
TPM_PP A96 Physical Presence pin of Trusted Platform Module (TPM); active high
TPM chip has an internal pull-down. This signal is used to indicate Physical
Presence to the TPM
Note
This signal has special functionality during the reset process. It may bootstrap some basic important functions of the module. For more
1.
information refer to section 8.2 "Bootstrap Signals".
2. Protected on the module by a series schotty diode. Therefore, pull-down resistor is required on the carrier board for proper logic level.
Table 30 General Purpose I/O Signal Descriptions
Signal Pin Description
GPO0 A93 General purpose output pin, shared with SD_CLK
Output from COM Express, input to SD
GPO1 B54 General purpose output pin, shared with SD_CMD
Output from COM Express, input to SD
GPO2 B57 General purpose output pin, shared with SD_WP
Output from COM Express, input to SD
GPO3 B63 General purpose output pin, shared with SD_CD
Output from COM Express, input to SD
GPI0 A54 General purpose input pin (bidirectional signal)
Pulled high internally on the module; shared with SD_DATA0
GPI1 A63 General purpose input pin (bidirectional signal)
Pulled high internally on the module; shared with SD_DATA1
GPI2 A67 General purpose input pin (bidirectional signal)
Pulled high internally on the module; shared with SD_DATA2
GPI3 A85 General purpose input pin (bidirectional signal)
Pulled high internally on the module; shared with SD_DATA3
Note
The conga-TCA7 provides GPIO signals on the COM Express connector by default.
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I/O PU/PD
I/O 3.3 V PU 2K2 3.3 VSB
I/O 3.3 V PU 2K2 3.3 VSB
O 3.3 V
O 3.3 V PD 100 KΩ
O OD PU 10KΩ 3.3 VSB
3.3 V
I OD PU 47 KΩ 3.3 V
I 3.3 V PD 10 KΩ
I/O PU/PD Comment
O 3.3 V
O 3.3 V
O 3.3 V
O 3.3 V
I 3.3 V PU 100KΩ 3.3 V Pull-up only active in GPIO mode
I 3.3 V
I 3.3 V
I 3.3 V
TA70m01
Comment
Requires a fan with a two pulse output
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