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Microsoft Windows Logo Program System and Device Requirements  —  173

Each function or device on the multifunction add-on device that is individually enumerated must provide a device ID for the bus it uses.

Exceptions to individual ID requirement for MF devices [Logo Program Clarification]

Multiple devices of the same device class, such as a multiline serial device.

Dependent video devices, such as a graphics accelerator on a video card.

Devices that are generated by an accelerator or auxiliary processor and that do not have independent hardware I/O. That processor must have an ID; under Windows XP, Mf.sys must be used to enumerate the dependent devices.

B12. Operation of one functional unit does not affect or interfere with the operation of another functional unit.

This applies whether the functional unit is on the multifunction device or on the system as a whole. Windows must be able to separately access each logical device that is individually enumerated, configure the device resources independently, and disable individual devices in the event of a conflict.

B12. Each functional unit is enumerated and its resource requirements communicated to the operating system.

This ensures Windows can load the necessary drivers and assign resources to the different units in any order.

For each individually enumerated device, resource configuration requirements are the same as for an equivalent device on a separate expansion card. This requirement means that registers cannot be shared among individually enumerated devices on a multifunction add-on device, but it does not supersede device requirements among different bus classes.

B12.1.4.3 Each independent function can be used concurrently, with no hidden dependencies

Separate functional units must be able to operate concurrently, without interfering with each other or with other devices on the system.

B12.1.4.4 Each function can be power managed independently

Each functional unit in a multifunction device must separately meet the power management device class specifications for its device class and be independently power managed. Each functional unit must be able to successfully complete a system sleep/wake transition (where the unit transitions from D0 to D3 to D0) without losing functionality and without requiring user intervention to restore functionality. All functional units on PCI devices that support wakeup capabilities must correctly support wake from D3cold.

B12.1.5 Multifunction Devices - FAQs

B12.1.5.1 Current general FAQs

See http://www.microsoft.com/winlogo/hardware/.

B12.1.5.2 Updated at B12.1.4
B12.1.5.3 Updated at B12.

B12.1.R Multifunction Devices - Future Requirements

Announcement of additional future requirements will be published at http://www.microsoft.com/winlogo/hardware/

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