Sun Microsystems Sun Netra CP3260, User Manual

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5-14 Netra CP3260 Blade Server User’s Guide • April 2009
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Environmental monitoring
■
Access to all environmental I
2
C devices
■
Access to all I
2
C devices when MPC is reset
5.2.8.1 Intelligent Platform Management Bus
The BMR-H8S provides dual buffered Intelligent Platform Management Bus (IPMB)
interfaces to the IPMB-0 bus on the PICMG 3.0 midplane. The I
2
C channels on the
H8S are connected the IPMB-A and IPMB-B through the I
2
C buffers. The I
2
C buffers
allow the blade server I
2
C to be isolated from the midplane until the blade server is
fully seated and the I
2
C bus on the midplane is idle.
5.2.8.2 Interface to the PPC
The BMR-H8S provides one serial payload interface to the PPC. This interface
supports hardware flow control,
RTS
(Request To Send) and
CTS
(Clear To Send).
5.2.8.3 IPMB-L Interface
The H8S provides a local IPMI interface wired to the ARTM’s MMC (
IPMB-L
). The
MMC IPMI interface is isolated through FET and controlled by H8 GPIO pins.
5.2.8.4 ATCA Hot-Swap Latch
Hot-swap is supported by monitoring of the hot-swap handle switch. The handle
switch goes directly to one of the GPIO pins on the H8S (PE5).
Payload Shutdown in Response to Hot-Swap
The hardware supports both non-graceful shutdown and graceful shutdown of
payload in response to a hot-swap event. In case of non-graceful shutdown,
firmware on the IPMC disables the voltage rails before turning the blue LED on.
Optionally the IPMC can send a message across the serial payload interface to the
PPC.