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USB Interface

BCM4354 Data Sheet

BROADCOM CONFIDENTIAL

Broadcom®

October 15, 2014 • 4354-DS109-R

Page 54

Despite the mode of operation (single peripheral or hub), the Bluetooth device is configured to include the

following interfaces:

USB Hub and UHE Support

The BCM4354 supports the USB hub and device model (USB, Revision 2.0, full-speed compliant). Optional

mouse and keyboard devices utilize Broadcom’s proprietary USB HID Emulation (UHE) architecture, which

allows these devices appear as standalone HID devices even though connected through a Bluetooth link.

The presence of UHE devices requires the hub to be enabled. The BCM4354 cannot appear as a single

keyboard or a single mouse device without the hub. Once either mouse or keyboard UHE device is enabled, the

hub must also be enabled.

When the hub is enabled, the BCM4354 handles all standard USB functions for the following devices:

• HID keyboard

• HID mouse

• Bluetooth

All hub and device descriptors are firmware-programmable. This USB compound device configuration (see

Figure 16 on page 53) supports up to three downstream ports. This configuration can also be programmed to a

single USB device core. The device automatically detects activity on the USB interface when connected.

Therefore, no special configuration is needed to select HCI as the transport.

The hub’s downstream port definition is as follows:

• Port 1 USB lite device core (for HID applications)

• Port 2 USB lite device core (for HID applications)

• Port 3 USB full device core (for Bluetooth applications)

When operating in hub mode, all three internal devices do not have to be enabled. Each internal USB device

can be optionally enabled. The configuration record in NVRAM determines which devices are present.

Interface 0

Contains a Control endpoint (Endpoint 0x00) for HCI commands, a Bulk In Endpoint (Endpoint

0x82) for receiving ACL data, a Bulk Out Endpoint (Endpoint 0x02) for transmitting ACL data,

and an Interrupt Endpoint (Endpoint 0x81) for HCI events.

Interface 1

Contains Isochronous In and Out endpoints (Endpoints 0x83 and 0x03) for SCO traffic. Several

alternate Interface 1 settings are available for reserving the proper bandwidth of isochronous

data (depending on the application).

Interface 2

Contains Bulk In and Bulk Out endpoints (Endpoints 0x84 and 0x04) used for proprietary testing

and debugging purposes. These endpoints can be ignored during normal operation.

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