Product Manual

Cambricon®
Copyright © 2020 Cambricon Corporation
15
4.3.4.2 THERMTRIP# overtemperature alarm signal
THERMTRIP# is triggered when MLU290-M5 chip junction temperature is over 100℃, which is
irreversible after effective. It is recommended to trigger fan full speed when the chip temperature of
MLU290-M5 is below 93℃, trigger power drop to 1/2 when chip temperature rises to 97℃, trigger
power drop to 1/4 when chip temperature rises to 98℃ , trigger power drop to 1/8 when chip
temperature rises to 99℃.If the chip temperature rises to 100℃, which means the power reduction
measures fail, the system may have fan failure or other catastrophic failures. At this time MLU290-M5
will pull down the THERMTRIP# signal to alarm baseboard management system. MLU290-M5 will
automatically cut off the power supply for shutdown protection after 1s.
THERMTRIP# signal will continue to be low after effective. It is recommended to confirm manually
on site, and restart the system after troubleshooting.
4.3.4.3 Power Configuration Signal
MLU290-M5 Intelligent Accelerating Card provides two power configuration pins:PWRBRK#
and PWRRDT#[1：0].PWRBRK# is based on the current power consumption and responses
fast.When low-level is effective,it is reduced to 1/4 of the current power
consumption.PWRRDT#[1：0] is a hardware implementation mode of power capping, which can
set 4 types of TDP power consumption: 350 W, 300W, 250W, 200. It is recommended that the
baseboard should be pulled up to 3.3V by default to obtain better performance.
The MLU290-M5 Intelligent Accelerating Card also supports setting the upper limit of TDP
power consumption by sending power capping instructions through the I2C interface, and the
setting range is 175 W-350W.
10Table 4.10 Power Configuration Signal Description
Signal
Direction of signal
Signal description
PWRBRK# I
Power brake,power is reduced to 1/4 of current
power consumption, low level is effective
PWRRDT#[1:0] I
TDP power setting pin, baseboard must
provide default 3.3 V high level
11 - L0 level, normal TDP power consumption
350 W, default
10 - L1 level,TDP power consumption reduced
to 300 W
01 - L2 level,TDP power consumption reduced
to 250 W
00 - L3 level,TDP power consumption reduced
to 200 W