cExpress-TL User’s Guide
PICMG COM.0 R3.0
Page 37
Copyright © 2021 ADLINK Technology, Inc.
4.3.10
Miscellaneous
Name
Pin #
Description
I/O
PU / PD
Comment
SPKR B32
Output for audio enunciator, the “speaker” in PC-AT
systems
O 3.3V
WDT B27
Output indicating that a watchdog time-out event has
occurred.
O 3.3V
PU 10K 3.3V
THRM# B35
Input from off-module temp sensor indicating an over-
temp situation.
I 3.3VSB
THRMTRIP# A35 Active low output indicating that the CPU has entered
thermal shutdown.
O 3.3VSB
PU 10K
3.3VSB
FAN_PWMOUT
B101
Fan speed control. Uses the Pulse Width Modulation
(PWM) technique to control the fan’s RPM.
O OD 3.3V
There shall be PD on carrier board
FAN_TACHIN
B102
Fan tachometer input for a fan with a two-pulse output.
I OD 3.3V
PU 47K 3.3V
TPM_PP A96
Trusted Platform Module (TPM) Physical Presence pin.
Active high. TPM chip has an internal pull down. This
signal is used to indicate Physical Presence to the TPM.
I 3.3V
PD 100K
PD only when TPM on module.
Modules implementing a TPM shall pull down
