Sun Microsystems CP3260 manual Intelligent Platform Management Bus, Interface to the PPC

■Environmental monitoring

■Access to all environmental I2C devices

■Access to all I2C devices when MPC is reset

5.2.8.1Intelligent 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 I2C channels on the H8S are connected the IPMB-A and IPMB-B through the I2C buffers. The I2C buffers allow the blade server I2C to be isolated from the midplane until the blade server is fully seated and the I2C bus on the midplane is idle.

5.2.8.2Interface 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).

5.2.8.3IPMB-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.

5.2.8.4ATCA 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.

5-14Netra CP3260 Blade Server User’s Guide • April 2009