Advantech MicroTCA UTCA-5503, Руководство пользователя

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7 UTCA-5503 User Manual
Chapter 1
B
oard Specification
1.2.5 USB Slave Interface
A full speed USB1.1 compliant slave port is implemented on a standard USB Type
mini-B connector on the front panel. The implementation uses a standard USB host
to a serial port converter chip which is cross-connected to the FPGA that implements
a MUX to either connect the UART port to the H8S Serial Debug Interface, the H8S
Command Line Interface or to a CPU on PCB3. The USB port can be used for
debugging, diagnostic information and implementation of a serial console interface.
1.2.6 Clock Module Extension
A 20-pin connector is used for attaching a clock module on a to-be-developed PCB
Level 2 (or PCB2) to the aMCH. The clock module has a tongue connector to the
backplane. The purpose of the mezzanine module is to support clock buffering and
distribution in an uTCA system. Furthermore, the aMCH supports one differential
input and one differential output to PCB3 (Fabric Extension Module) as well as one
differential and one single ended clock input from the Clock IO module and one differ-
ential clock output to the Clock IO module. Application of the clocks connected to
PCB3 is reference clock distribution for fabric interface switches, especially in spread
spectrum environments which are common in PCIe applications. Application of the
clocks connected to the Clock IO module (PCB2) is multi-carrier/shelf synchroniza-
tion and clock distribution as well as external reference clock reception such as GPS
derived clocks or BITS clocks. For applications requiring lower accuracy and stability,
the square wave output of the RTC on PCB 1 is also connected to the clock module.
The clock module is connected to the MCMC’s private I2C bus and implements a
FRU EEPROM on this bus. It is also connected to the I2C_ALARM interrupt line to
the MCMC.
1.2.7 Clock I/O / Alarm Module Extension
The aMCH can also support another extension module on the to-be-developed
PCB2: the ClockIO/ Alarm module. This module will have access to the front panel.
As the name indicates, this extension socket can accept two kinds of modules: a
ClockIO module or an Alarm Module.
The function of the ClockIO module is to provide front panel connectivity, basic signal
buffering, and protection to external clocks. And, the Alarm module can carry a mini-
mum set of Telco style Alarm circuitry.
1.2.8 Fabric Extension Module
The fabric extension module can be implemented on the to-be-developed PCB3. Its
purpose is to provide fat pipes switching capabilities for protocols such as PCIe,
XAUI, SRIO amongst others. Moreover, application processors can also be sup-
ported on PCB3. For example, an application processor on PCB3 can be used to cre-
ate a firewall between the outside world’s LAN and the internal base fabric on the
uTCA backplane.