Chapter 3
Hardware
22
Reference Manual
nanoX-TCR
COM Express A-B Connector
This section provides descriptions of interfaces and signals within the COM Express A-B connector. 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
•
CAN Bus [
Optional
]
•
GPIO
LPC Interface
The nanoX-TCR offers the LPC (Low Pin Count) bus through the CPU. 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 an ISA bus, I/O extensions such as
additional serial ports can be easily implemented on an application specific baseboard using this bus.
SATA Interface
Two
Serial ATA connections (SATA0 and SATA1) are provided through the Intel
®
EG20T (PCH). The
SATA1 port is dedicated for an optional SSD (Solid State Drive) and is not available for use if the board
model supports an SSD. 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. SATA is
completely protocol and software compatible to parallel ATA.
USB Interface
The PCH offers two USB host controllers, which contain six USB ports. Each port complies with USB
standards 1.1 and 2.0 and offers high-speed, full-speed, and low-speed capabilities. The USB interface also
provides one USB client port for the Mini-USB connector on the baseboard.
Power Interface
A 12V voltage rail on the A-B COM Express connector accepts the voltages required for the board. The
RTC 3.3V battery feed and 5V standby functions draw power through the A-B connector. The nanoX-TCR
requires a 4.75V to 14V wide-range power supply with optional 5V standby for ATX support.
Power Management
The nanoX-TCR is ACPI 3.0 compliant with smart battery support. The board supports S0, S1, S3, S4, and
S5 sleep states.
