![]() For more information about how the new 1394 bus driver retrieves the contents of a node's configuration ROM, see Retrieving the Contents of a IEEE 1394 Node's Configuration ROM. The 1394ohci.sys bus driver requires a physical layer (PHY) that supports IEEE-1394a or IEEE-1394b. It does not support a PHY that supports IEEE-1394-1995. ![]() ![]() This requirement is due to the 1394ohci.sys bus driver's exclusive use of short (arbitrated) bus resets. NODE_DEVICE_EXTENSION Structure UsageĪ client driver can reference the device extension in the 1394 bus driver associated with the physical device object (PDO) for the device that the client driver controls. ![]() This device extension is described by the NODE_DEVICE_EXTENSION structure. In 1394ohci.sys, this structure remains at the same location as in the legacy 1394 bus driver, but the nonstatic members of the structure might not be valid. When a client driver uses the new 1394 bus driver, they must make sure that the data accessed in NODE_DEVICE_EXTENSION is valid. The static members of NODE_DEVICE_EXTENSION that contain valid data are Tag, DeviceObject, and PortDeviceObject. All other members NODE_DEVICE_EXTENSION are nonstatic, which the client driver must not reference. The default behavior of the 1394ohci.sys bus driver is to optimize the gap count when it finds only IEEE 1394a devices on the 1394 bus, excluding the local node. For example, if the system that is running 1394ohci.sys has a host controller that complies with IEEE 1394b but all devices on the bus comply with IEEE 1394a, then the new 1394 bus driver tries to optimize the gap count. Gap count optimization occurs only if the 1394ohci.sys bus driver determines that the local node is the bus manager. 1394 firewire driver windows 10 64 bit download#.1394 firewire driver windows 10 64 bit install#.
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