Intel ® Q87 Express Chipset; Direct Media Interface (Dmi); Usb - Intel DQ87PG Specification

®
1.5 Intel
Intel Q87 Express Chipset with Intel Flexible Display Interconnect (Intel FDI) and
Direct Media Interface (DMI) interconnect provides interfaces to the processor and the
display, USB, SATA, LPC, LAN, and PCI Express interfaces. The Intel Q87 Express
Chipset is a centralized controller for the board's I/O paths.
For information about
The Intel Q87 chipset
Resources used by the chipset
1.5.1

Direct Media Interface (DMI)

Direct Media Interface (DMI) is the chip-to-chip connection between the processor and
PCH. This high-speed interface integrates advanced priority-based servicing allowing
for concurrent traffic and true isochronous transfer capabilities.
1.5.2

USB

The PCH contains up to two Enhanced Host Controller Interface (EHCI) host controllers
that support USB high-speed signaling. High-speed USB 2.0 allows data transfers up to
480 Mb/s. All ports are high-speed, full-speed, and low-speed capable.
The PCH also contains an integrated eXtensible Host Controller Interface (xHCI) host
controller which supports USB 3.0 ports. This controller allows data transfers up to
5 Gb/s. The controller supports SuperSpeed (SS), high-speed (HS), full-speed (FS),
and low-speed (LS) traffic on the bus.
The Intel Q87 Express Chipset provides the USB controller for the USB 2.0/3.0 ports.
The port arrangement is as follows:
• USB 3.0 ports:
 Four USB 3.0 ports are implemented with stacked back panel connectors
 Two front panel USB 3.0 ports are implemented through one internal connector
USB 2.0 ports:
•
 Two ports are implemented with stacked back panel connectors
 Six front panel ports are implemented through three dual-port internal headers
NOTE
Computer systems that have an unshielded cable attached to a USB port may not
meet FCC Class B requirements, even if no device is attached to the cable. Use a
shielded cable that meets the requirements for full-speed devices.
For information about
The location of the USB connectors on the back panel
The location of the front panel USB headers
Q87 Express Chipset
Refer to
http://www.intel.com/products/desktop/chipsets/index.htm
Chapter 2
Product Description
Refer to
Figure 9, page 49
Figure 10, page 50
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