User`s manual

14 CMX34GS cpuModule BDM-610000082 Rev A
– When a COM port connector is configured for dual-port mode, enabling/disabling COM port
termination enables/disables the termination for both ports on that connector. (Some previous
generations of cpuModules have the ability to independently enable/disable termination on
both ports when configured for dual-mode.)
Software Differences
The newer AMD G-Series cpuModules have several software-related differences, which are summarized below.
Complete information about these CMX34GS features can be found in Chapter 4, Using the cpuModule.
aDIO
While the 16-pin aDIO connector is pin-for-pin compatible with previous generations of RTD cpuModules (such
as the Montevina series), the hardware is slightly different, and requires that writes ands reads to/from the aDIO
ports happen no more than once per millisecond. Migrating legacy software to the G-Series that utilizes RTD’s
Advanced Digital I/O may require that you add this delay prior to all reads and writes.
UEFI Shell
Previous generations of RTD cpuModules contained a Failsafe Boot ROM image, which permitted the
cpuModule to boot to a DOS prompt even when no disk drives were connected to the system. The RTD G-Series
cpuModules provide a similar prompt, called the Unified Extensible Firmware Interface (UEFI) Shell, which
provides an enviroment to execute simple commands when no bootable devices are connected to the system.