---
title: IOUSBInterfaceAssociationDescriptor
framework: IOKit
role: pseudoSymbol
platforms: []
path: iokit/usb_h_user-space/iousbinterfaceassociationdescriptor
---

# IOUSBInterfaceAssociationDescriptor

## Declaration

```occ
struct IOUSBInterfaceAssociationDescriptor {
   UInt8 bLength;
   UInt8 bDescriptorType;
   UInt8 bFirstInterface;
   UInt8 bInterfaceCount;
   UInt8 bFunctionClass;
   UInt8 bFunctionSubClass;
   UInt8 bFunctionProtocol;
   UInt8 iFunction;
};
```

## Overview

USB Inerface Association Descriptor. ECN to the USB 2.0 Spec. See the USB Specification at [http://www.usb.org](../../link-1670329.md).

## See Also

### Related Documentation

- [IOUSBInterfaceAssociationDescriptor](../../kernel/iousbinterfaceassociationdescriptor.md)