BCM43907 Preliminary Data Sheet
USB 2.0
USB 2.0
Overview
The USB 2.0 host controller (HC) and device controller (DC) interface to a backplane via Advanced eXtensible
Interface (AXI) and Advanced Peripheral Bus (APB). They interface externally through a USB 2.0 and HSIC
interfaces.
Figure 9 shows the topology of the USB 2.0 core.
Figure 9: Topology of the USB 2.0 Core
AXI/APB
USB Device
Controller
USB Host
Controller
APB
UTMI/ULPI
UTMI/ULPI
Host/
Device
Select
Multiplexer
UTMI/ULPI
USB 2.0 PHY
Chip
Boundary
USB I/F
The BCM43907 contains both a USB 2.0 HC and DC. Therefore, it can operate in the host-only, device-only,
and dual-role device (DRD) modes. In DRD mode, the BCM43907 can be configured as either the host or a
device on the fly but must remain in the same mode until the next boot cycle. The restriction that the host or
device mode remains fixed during a boot cycle is what differentiates DRD from On-the-Go (OTG).
The state of the USB2_DSEL pin sets the mode as either host or device for USB Type A and Type B connectors.
For a USB Micro-AB connector, the USB2_DSEL pin sets the mode as either host or device while the overall
mode is DRD.
Broadcom®
March 12, 2016 • 43907-DS104-R
Page 38
BROADCOM CONFIDENTIAL
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