Motorola CPX8216TCPX8216T ユーザーズマニュアル
Staged Pins
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Staged Pins
The PICMG CompactPCI hot swap specification provides for three
separate pin lengths in order to control the insertion and extraction
voltages and to notify the system when boards are inserted or extracted.
separate pin lengths in order to control the insertion and extraction
voltages and to notify the system when boards are inserted or extracted.
The longest pins, which include VCC pins and GND pins, are the first to
mate during the insertion process and the last to break contact during
extraction. These pins are used to supply power to pre-charge the PCI
interface signals to a neutral state before they contact the bus. This pre-
charging serves to minimize the capacitive effects of the board as it makes
or breaks contact with the bus.
mate during the insertion process and the last to break contact during
extraction. These pins are used to supply power to pre-charge the PCI
interface signals to a neutral state before they contact the bus. This pre-
charging serves to minimize the capacitive effects of the board as it makes
or breaks contact with the bus.
The medium-length pins carry PCI and other signal traffic.
The shortest pins are used to assert signals, including BD_SEL#. During
insertion, the BD_SEL# signal enables the board to attach to the local PCI
bus. On extraction, it causes the board to logically and electrically
disconnect from the PCI bus before the bus pins physically break contact
with the bus.
insertion, the BD_SEL# signal enables the board to attach to the local PCI
bus. On extraction, it causes the board to logically and electrically
disconnect from the PCI bus before the bus pins physically break contact
with the bus.
BD_SEL#
BD_SEL# is asserted by one of the pins that mate last on insertion and
break first on extraction. On insertion, the signal tells the board to connect
to the PCI bus. On extraction this pin breaks first, causing the board to
logically and electrically disconnect from the PCI bus before the PCI bus
pins physically break contact with the bus.
break first on extraction. On insertion, the signal tells the board to connect
to the PCI bus. On extraction this pin breaks first, causing the board to
logically and electrically disconnect from the PCI bus before the PCI bus
pins physically break contact with the bus.
ENUM#
An ENUM interrupt is generated when a board is hot inserted into the
CPX8216 chassis, or when an operator trips the board microswitch by
raising its ejector handles. The signal informs the active CPU that the
status of a board has changed. The CPU then identifies the board by polling
the INSert and EXTract bits in all of the boards’ Control Status Registers.
CPX8216 chassis, or when an operator trips the board microswitch by
raising its ejector handles. The signal informs the active CPU that the
status of a board has changed. The CPU then identifies the board by polling
the INSert and EXTract bits in all of the boards’ Control Status Registers.