Connector Subsystems Rows A, B, C, D

Chapter 2

Specifications

The COM 830 is connected to the carrier board via two 220-pin connectors (COM Express Type 2 pinout) for a total of 440 pins connectivity. These connectors are broken down into four rows. The primary connector consists of rows A and B while the secondary connector consists of rows C and D.

In this view the connectors are seen “through” the module.

Primary Connector Rows A and B

The following subsystems can be found on the primary connector rows A and B.

Serial ATA™ (SATA)

Two Serial ATA150 connections are provided via the Intel® 82801GHM (ICH7M-DH). SATA is an enhancement of the 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 150 Mbytes/s and can be expanded up to 600 Mbytes/s in order to accommodate future developments. SATA is completely protocol and software compatible to parallel ATA.

USB 2.0

The COM 830 offers 4 UHCI USB host controllers and one EHCI USB host controller provided by the Intel® 82801GHM (ICH7M-DH). These controllers comply with USB standard 1.1 and 2.0 and offer a total of 8 USB ports via connector rows A and B.

NOTE The USB controller is a PCI bus device. The BIOS allocates the necessary system resources when configuring the PCI devices.

AC'97 Digital Audio Interface/HDA

The COM 830 provides an interface that supports the connection of AC'97 digital audio codecs as well as HDA audio codecs.

Gigabit Ethernet

The COM 830 is equipped with a Marvell 88E8056 Gigabit Ethernet Controller. This controller is implemented through the use of the sixth x1 PCI Express lane. The Ethernet interface consists of 4 pairs of low voltage differential pair signals designated from GBE0_MD0 (+ and -) to GBE0_MD3 (+ and -) plus control signals for link activity indicators. These signals can be used to connect to a 10/100/1000 BaseT RJ45 connector with integrated or external isolation magnetics on the carrier board.

LPC Bus

COM 830 offers the LPC (Low Pin Count) bus through the use of the Intel® 82801GHM (ICH7M-DH). There are already many devices available for this Intel defined bus. The LPC bus corresponds approximately to a serialized ISA bus yet with a significantly reduced number of signals. Due to 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.

I²C Bus 400kHz

The I²C bus is implemented through the use of ATMEL ATmega168 microcontroller. It provides a Fast Mode (400kHz max.) multi-master I²C Bus that has maximum I²C bandwidth.

COM 830

Reference Manual