COMe-cTL6 – User Guide Rev. 1.7
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2.3.19.
SMBus
SMBbus on COMe connector (B13, B14) is shared with onboard devices, so special care must be taken while selecting
addresses for carrier devices. SMBus clock and data lines are divided into multiple voltage domains by discrete FET
switches.
Table 30: SMBus
8bit
7bit
Description
A0h
50h
DDR4 Channel A SPD EEPROM (SO-DIMM)
A4h
52h
DDR4 Channel B SPD EEPROM (memory down)
30h
18h
DDR4 Channel A optional temperature sensor (SO-DIMM)
5Ch
2Eh
Hardware monitor
ACh
06h
HW-Mon reserved
Another FET switch disconnects the module SMB from the carrier during boot up. After BIOS has finished
configuration of the on-board devices, it asserts EN_SMB_EXT# to close the switch.
Table 31: SMB Alert
Signal
PCH Pin
Description
SMB_ALERT#
GP_C02/SMB_ALERT_#
SMB Alert# connects directly to COMe.
2.3.20.
Wake Signals
Table 32: Wake Signals
COMe Signal
PCH Pin
Description
WAKE0#
WAKE#
passed through CPLD
WAKE1#
GPP_E16/ISH_GP7
passed through CPLD
2.3.21.
Suspend Control
Table 33: Suspend Control
COMe Signal
PCH
SUS_STAT#
From CPLD
SUS_S3#
GPD4/PM_SLP_S3#
SUS_S4#
GPD5/PM_SLP_S4#
SUS_S5#
GPD10/PM_SLP_S5#
2.3.22.
Power Good (PWR_OK)
Low level will prevent the module to enter S0 state. A falling edge during S0 will cause a direct switch to S5 (power
failure).
