Intel® Server Board SE7520BD2 Technical Product SpecificationPlatform Management Architecture
Revision 1.3
Intel Confidential
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is no system management interface, only a hardware monitor (Heceta 7 and SIO) for fans,
voltage, temperature, reset, and voltage monitoring.
The platform has two modes of system management operation. The first mode is strictly
hardware monitoring and fan control to monitor critical systems and control all fans. The second
mode utilizes a system management card to support enhanced server management features,
control reset/power good functionality and provide an interface for the user to access devices on
different SMBuses. This is done through the system management connection described in the
previous subsection.
4.6.1
SIO Keyboard and Mouse
The SIO keyboard/mouse signals can be driven from the KVM solution when there is a need for
remote management. Logic on the module performs the appropriate voltage translation from the
output of the 3.3V KVM solution to the required input voltage of the SIO.
4.6.2
PS2 Keyboard and Mouse
The PS2 keyboard/mouse signals are supplied to the KVM solution for encrypting and sending
over the FML/SMBUS bus. This enables local keyboard/mouse activity to be observed by
remote management. The KVM solution will pass this data on to the SIO.
Local keyboard/mouse activity takes priority over remote activity. The signals from the PS2
connector are typically pulled up to 5V and the KVM solution is not 5V tolerant. Voltage
translation logic is available on the module to convert the bi-directional interface to a signaling
level the KVM solution can tolerate.
In order for the KVM solution to work, the PS2 to SIO connection on the baseboard must be
broken. Logic must be supplied on the baseboard to break the connection when the
KM_INHIB_N signal is asserted.
4.6.3
Fast Management Link (FML)
The Fast Management Link interface is a single master and single slave bus, which can also
operate in a SMBUS mode. The FML provides a high-speed interface to an Intel
®
networking
component for KVM and web-based management traffic.
The FML bus is Intel proprietary. Its electrical characteristics and protocols will be defined in a
separate document. The bus operates at 8Mhz. It is meant to be point-to-point routing, and it
largely follows the SMBUS protocols but uses separate wires for Data In (FML_SDA) and Data
Out (FML_MDA_I2CSDA). There is a separate line for the clock (FML_CLK_I2CSCL), which is
always driven by the master.
The bus supports a dual-purpose interrupt/clock stretching line (FML_SINTEX), which is driven
by the slave device. The two purposes are more fully described as follows:
•
Alert the master device to read from slave. When the interrupt is asserted, it will be
asserted until the next start.
•
Clock extension. When set to zero, it indicates to the master to extend its current clock
state (if the master clock is high it should remain high until the FML_SINTEX is high
again). This way, the slave can hold the transaction when it is not ready yet.