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Chapter Eight : Motherboard Hardware Support
71
ACPI State Reporting
The motherboard must provide hardware circuitry to drive an encoded version of the ACPI state of
the system to the OPMA connector. The MegaRAC M300V card uses this information to provide
accurate ACPI status to a remote location. This information is also useful in determining when
certain sensors are and are not valid. Some sensors may not be valid in certain ACPI states. The
assumption here is that the encoding function could easily be put into an existing PLD on the
server motherboard. PLDs are typically used for purposes like power rail sequencing and so on.
Signal Encoding for ACPI State Reporting
State
ACPI State
Encoded Value
1 ACPI
S0
000b
2 ACPI
S1
001b
3 ACPI
S2
010b
4 ACPI
S3
011b
5
ACPI S4, S5
100b
6 Reserved
101b
7 Reserved
110b
8 Reserved
111b
DVI–Digital Visual Interface
The motherboard must route the DVI-I signals from the video chip to the OPMA connector. The
video chip selected for the system must be capable of providing DVI-I signals. The DVI-I signals
are used by MegaRAC M300V card for the purpose of video redirection in the KVMoIP
(Keyboard, Video and Mouse redirection through internet protocol) feature. The DVI signals
should be properly terminated on the motherboard to handle the case where either no MegaRAC
M300V card is installed or where a MegaRAC M300V card that does not support KVMoIP is
installed.
ICMB RS-485 Level Translation Circuit
The motherboard must provide the level translation hardware along with the connector for the
ICMB (Intelligent Chassis Management Bus). Physically, the ICMB is a multi-drop, multi-master,
two-wire, half-duplex, differential drive bus, utilizing RS-485 transceivers. For more details on the
ICMB connector specification and circuitry, refer to the following document:
IPMI-Intelligent Chassis Management Bus Bridge Specification v1.0, Document Revision 1.1.
Management UART Signal Level Translation
The motherboard must provide the necessary level translation circuitry to convert the management
UART signals coming from the OPMA connector to RS-232 compliance. From the level
translator, these signals are routed to the pack panel RS-232 connector that is shared between the
management UART and the system UART.
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