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Intel
®
NetStructure
TM
ZT 7102 Chassis Management Module
Slot Power Control
Technical Product Specification 77
12.0 Slot Power Control
The chassis management module controls power to the node and fabric slots of a chassis using the
BD_SEL# and HEALTHY# hardware signals. The CMM can power up, power down, and reset a
board in a particular slot, as well as to place a slot into an offline mode. The CMM can also be used
to query the power state of a board at any time.
12.1 Difference between a Board’s HEALTHY# Signal and a
Board’s Health
Confusion may arise as to the difference between the HEALTHY# hardware signal coming from a
board and the board’s health retrieved using the CLI command:
cmmget -l bladeN -d health
A board’s HEALTHY# signal is a PICMG-specified hardware signal on the CompactPCI
connector. The PICMG 2.0 specification defines HEALTHY# to be a signal generated by a board’s
hot swap control logic. At a minimum, HEALTHY# should be asserted by the hot swap control
when all of the voltages are good. Additional logic may be implemented above this to generate the
HEALTHY# signal. The CMM uses the HEALTHY# hardware signal to determine when a board is
powered up completely.
The board’s health, as returned by the CLI command listed above, is used to determine whether
there are any active health events occurring on a particular board, such as temperature or voltage
violations.
12.2 Slot Power-Up Sequence
The CMM constantly polls the status of the BD_SEL# lines coming from the node and fabric slots.
Boards inserted into the chassis will pull the BD_SEL# line to Vcc, indicating insertion of the
board.
12.2.1 Assertion of BD_SEL#
Upon detection of board insertion, the CMM determines whether to assert BD_SEL# based on the
type of board being inserted and the type of slot the board is being inserted to.
12.2.1.1 System Master Boards
For system master boards in system master slots, the CMM will always assert BD_SEL#.
12.2.1.2 Peripheral Boards
For peripheral boards inserted into peripheral slots, the CMM will ONLY assert BD_SEL# if a
system master board is present for that PCI segment. If a peripheral board is inserted into a system
master slot, or into a peripheral slot in a PCI segment with no system master, the CMM will not
assert BD_SEL# for that board.