Miscellaneous Signals - ADLINK Technology arm AMPERE COM-HPC-ALT User Manual

COM-HPC-ALT User's Guide

4.3.15 Miscellaneous Signals

Name Pin #
WD_OUT B11
WD_STROBE# B10
FAN_PWMOUT C11
FAN_TACHIN C12
RSVD
WD_OUT
If a Module supports a watchdog timer it shall minimally support output mode 1 and may also support output modes 2 or 3 as defined in the table
below. The selection of the output modes may be realized by software configurable hardware or by Module build options.
WD Mode Description
1 The Module generates an internal reset. Module output pin PLTRST# is driven low. The WD_OUT
pin is driven high until the unit resets.
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Description
Output indicating that a watchdog time-out event
has occurred. Refer to Section 5.3 for details.
Strobe input to watchdog timer. Periodic strobing
prevents the watchdog, if enabled, from timing out.
Fan speed control for a secondary system fan. The
primary fan control signals for CPU thermal
management are on the Module, along with a vendor
specific connector.
Fan controls use the Pulse Width Modulation (PWM)
technique to control the fan's RPM. CMOS output;
Carrier designers should buffer this signal with an
open drain FET and pullup or other robust Carrier
device(s).
Fan tachometer input for a fan with a two pulse
output for the secondary fan.
Reserved pins. These may be assigned functions in
future versions of this specification. Reserved pins
shall not be connected to anything, and shall not be
connected to each other.
Copyright © 2023 ADLINK Technology, Inc.
I/O PU / PD Comment
O 3.3V
I 3.3V PU 10K
O 3.3V
I OD PU 1K
3.3V
Comment
PICMG COM-HPC R1.0