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5. System Monitoring and Control
The ZT 5504 performs system control and monitoring functions using an Intel Baseboard
Management Controller (BMC) ASIC. The BMC has the following features.
• IPMB_PWR delivers 5VDC (1A/pin) to the BMC; other required voltages are derived from
this.
• Power ramping controls inrush current and avoids glitching the IPMB power rail.
• On power-up, the BMC is held in reset until power is stable.
• A 1024K x 8 flash device and a 32K x 8 SRAM device are used for code and data storage.
• Six IPMI-compliant Interfaces are available.
Monitoring and Control Functions
The BMC tracks the heartbeat of the Host CPU by monitoring several parameters on the
ZT 5504. Most of these parameters are measured by the Analog Devices, ADM1026, System
Monitoring Device. Monitoring and control functions are listed below.
Monitoring Functions
• Onboard Power Supplies, +3.3, +5, +12, and –12V supplies.
• VTT Supply
• CPU Core Supply
• Onboard and CPU Temperatures
• CPU VID Lines
• Eject signals from front- and rear-panel
• Global Addressing Bits GA[0:4]
• SIO Low Frequency Clock (Real Time Clock Monitoring Frequency from SIO)
• Power Ok
• Hot swap controller fault condition
• Back end Power Fail and Power Degrade signals
• SMBUS Alert signals
• PCI_PRESENT#, SYSSLOT#, BDSEL# for dual domain mode support
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