Power Digital Piano with Firewire power

15-inch MacBook Pro Computers (January 2006)

The 15-inch MacBook Pro computers introduced in January 2006, based on the Intel Core Duo microprocessor, provide one FireWire 400 port supported by an Open HCI FireWire controller with an integrated FireWire 400 PHY (Physical Layer). The port supports IEEE 1394a with a maximum data rate of 400 Mbps (50 MBps). The Open HCI controller provides the FireWire Link layer and DMA (Direct Memory Access) through the 32-bit 33 MHz PCI interface on the South Bridge. The integrated PHY implements the electrical signaling protocol and arbitration defined in the IEEE 1394a standard.
FireWire power is present anytime the AC adaptor is powering the system, including shutdown. On battery power, FireWire power is present only during system run and is un-powered in sleep and shutdown to prevent unintentional battery drain.
The 15-inch MacBook Pro's six pin FireWire connector provides unregulated 9 to 12.6 V @ 0.9 A maximum (fused). Developers should design to < 7 W maximum sustainable power.
Output voltage follows the system's battery power, such that voltage is dependent on the state of the battery's charge, as listed below.

• When the system is receiving AC power, with either a fully charged battery present or no battery present, output voltage is nominally 12.6 V. FireWire power is on in run, sleep, or shutdown.
• When the system is receiving AC power, and the battery is charging, output voltage will follow the battery voltage (unregulated 9V – 12.6 V). FireWire power is on in run, sleep, or shutdown.
• When the system is not receiving AC power, the output voltage follows the battery voltage (unregulated 9 V – 12.6 V), and only when the system is running. FireWire power is turned off in system sleep or shutdown when no AC power is present.

The 15-inch MacBook Pro has a single FireWire port, hence, there is no repeater function.

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