PC6-TANGO • CompactPCI
®
PlusIO • Intel® Atom™ E39xx Processor (APL-I SoC)
Utility Interfaces
Besides the high speed mezzanine interface connector P-HSE, the PC6-TANGO is provided with the
utility interface expansion connector P-EXP, which comprises several legacy interfaces, which may be
useful for system expansion on mezzanine cards:
<
HD Audio
<
LPC (Low Pin Count) @ 25MHz clock
<
I2C
<
2 x USB 2.0
<
UART Rx/Tx
All signals are controlled by the APL-I SoC. The I2C signals on P-EXP are derived from the APL I2C port
0 and not shared with any other components on the PC6-TANGO, thus avoiding any potential I
2
C
address conflict.
The HD Audio port requires an additional audio codec, as provided e.g. on the PCS-BALLET side card.
The LPC bus presents an easy way to add legacy interfaces to the system. EKF offers a variety of
mezzanine expansion boards (side cards), to be attached on top of the PC6-TANGO, featuring all
classic Super-I/O functionality, for example the PCS-BALLET. Access to the side card connectors PS/2
(mouse, keyboard), COM, USB and audio in/out is given directly from the common 8HP front panel.
The LPC I/F is shared with the TPM (Trusted Platform Module) on the PC6-TANGO. Some side cards
however may be also equipped with a TPM device, which would result in a conflict. For usage
together with the PC6-TANGO, side cards must be ordered w/o a TPM soldered.
The USB 2.0 ports can be used on a mezzanine side card for front I/O, or for on-board devices.
A lean UART I/F is also available via the P-EXP connector, comprised of Rx and Tx (TTL level signals)
only. It can be used for processor debug, or customer application. External transceivers to RS-232 or
RS-485 would have to be added, and in-band data flow control (XON/XOFF) should be setup.
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