ADLINK Express-HRR - Manual (Page 26)

Chapter 3 Hardware
22 Reference Manual Express-HRR
*Located on the baseboard.
COM Express A-B Connector
This section provides descriptions of interfaces within the COM Express A-B connector. The COM Express
connector interface comprises two identical 220-pin connectors (A-B and C-D). The COM Express A-B
connector provides the following features:
• LPC interface
• SATA interface
• USB interface
• Power interface
• Power Management
• Video interfaces
• HD Audio interface
• Gigabit Ethernet interface
• I²C interface
• PCI Express
• SMBus
• GPIO
LPC Interface
The Express-HRR offers the LPC (Low Pin Count) bus through the Intel ® BD82QM67 (PCH). Many
devices already exist for this Intel defined bus. The LPC bus corresponds approximately to a serialized ISA
bus yet with a significantly reduced number of signals. Because of the software compatibility to the ISA bus,
I/O extensions such as additional serial ports can be easily implemented on an application specific baseboard
using this bus.
SATA Interface
Four Serial ATA connections are provided through the Intel BD82QM67 (PCH). SATA is an enhancement
of parallel ATA therefore offering higher performance. As a result of this enhancement, the traditional
restrictions of parallel ATA are overcome with respect to speed and EMI. SATA starts with a transfer rate of
1.5 Gb/s and can be expanded up to 3Gb/s on all ports and up to 6 Gb/s on SATA0 and SATA1 in order to
accommodate future developments. SATA is completely protocol and software compatible to parallel ATA.
USB Interface
The PCH offers four UHCI USB host controllers and two EHCI USB host controllers. These controllers
comply with USB standard 1.1 and 2.0 and offer a total of eight USB ports through connector A-B. All ports
are high-speed, full-speed, and low-speed capable. The port routing logic determines whether a USB port is
controlled by one of the UHCI controllers or by one of the EHCI controllers.
Power Interface
A 12V voltage rail on both A-B and C-D COM Express connectors accepts the voltages required for the
board. The RTC 3.3V battery feed and 5V standby functions draw power through the A-B connector.
04D0-04D1 Edge/Level Trigger PIC
0CF9 Reset Control Register
Table 3-3. I/O Address Map (Continued)