PC Concepts SHG2 DP - Manual (Page 42)

Server Management Intel® SHG2 DP Server Board Technical Product Specification
Intel Order Number C11343-001 Revision 1.0 30
5.1 Sahalee Baseboard Management Controller
The Sahalee BMC contains a 32-bit RISC processor core and associated peripherals used to
monitor the system for critical events. The Sahalee BMC, packaged in a 156-pin BGA,
monitors all power supplies, including those generated by the external power supplies, and
those regulated locally on the server board. The Sahalee BMC also monitors SCSI termination
voltage, fan tachometers for detecting a fan failure, and system temperature. Temperature is
measured on each of the processors and at locations on the server board away from the fans.
When any monitored parameter is outside of defined thresholds, the Sahalee BMC logs an
event in the System Event Log (SEL).
Management controllers and sensors communicate on the I
2
C-based Intelligent Platform
Management Bus (IPMB). Attached to one of its private I
2
C bus is Heceta5*, an ADM1026*,
which is a versatile systems monitor ASIC. Some of its features include:
•
Analog measurement channels
• Fan speed measurement channels
•
General-Purpose Logic I/O pins
• Remote temperature measurement
•
On-chip temperature sensor
• Chassis intrusion detect
Table 18 details some of the inputs on the Heceta5 (ADM1026) as used on the SHG2 server
board.
Table 18. ADM1026* Input Definition
Pin ADM1026 Signal Name Type External Signal Name / Function
1 GPIO9 Digital Input CPU2_IERR / CPU2 IERR
2 GPIO8 Digital Input CPU1_IERR / CPU1 IERR
3 FAN0/GPIO0 Digital Output ADM_DIS_CPU1_L / CPU1 Stop Clock
4 FAN1/GPIO1 Digital Output ADM_DIS_CPU2_L / CPU2 Stop Clock
5 FAN2/GPIO2 Digital Input Not connected / None
6 FAN3/GPIO3 Digital Input Not connected / None
9 FAN4/GPIO4 Digital Input ADM_INTR / Control INTR signal for frequency select
10 FAN5/GPIO5 Digital Input ADM_NMI / Control NMI signal for frequency select
11 FAN6/GPIO6 Digital Input ADM_A20MN / Control A20MN signal for frequency select
12 FAN7/GPIO7 Digital Input ADM_IGNNEN / Control IGNNEN signal for frequency select
13 SCL Digital Input SM3_CLK / Open-drain Serial Bus Clock. Requires 1k pull-up
resistor.
14 SDA Digital I/O SM3_DATA / Serial Bus Data. Open-drain output. Requires 1k
pull-up resistor.
16 CI (Chassis Intrusion) Digital Input FRONTOPEN+03 / An active high input which captures a
Chassis Intrusion event in Bit 7 of Status Register 4. This bit will
remain set until cleared, so long as battery voltage is applied to
the VBAT input, even when the ADM1026 is powered off.
18 PWM Digital Output ADM_FAN_PWM / Pulse-width modulated output for control of
fan speed. Open drain.
19 RESET_STBY Digital Output RST_BMCRST_L / Power-on Reset. 5 mA driver (open drain),